Document And Entity Information - shares	6 Months Ended
Document And Entity Information - shares	Jun. 30, 2018	Jul. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Entity Registrant Name	SMARTFINANCIAL INC.
Entity Central Index Key	0001038773
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Trading Symbol	SMBK
Entity Common Stock, Shares Outstanding		12,704,581

CONSOLIDATED BALANCE SHEETS - USD ($)	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 66,243,037	$ 64,097,287
Interest-bearing deposits at other financial institutions	101,992,073	41,965,597
Federal funds sold	2,000,000	6,964,000
Total cash and cash equivalents	170,235,110	113,026,884
Securities available-for-sale, at fair value	156,577,182	151,944,567
Restricted investments, at cost	8,272,600	6,430,700
Loans, net of allowance for loan losses of $7,073,937 at June 30, 2018 and $5,860,291 at December 31, 2017	1,568,360,556	1,317,397,909
Bank premises and equipment, net	52,202,992	43,000,249
Foreclosed assets	3,524,239	3,254,392
Goodwill and core deposit intangible, net	68,449,478	50,836,840
Cash surrender value of life insurance	21,944,300	21,646,894
Other assets	12,665,515	13,232,247
Total assets	2,062,231,972	1,720,770,682
Deposits:
Noninterest-bearing demand deposits	301,317,854	220,520,287
Interest-bearing demand deposits	246,942,432	231,643,508
Money market and savings deposits	632,518,003	543,644,830
Time deposits	535,879,278	442,774,094
Total deposits	1,716,657,567	1,438,582,719
Securities sold under agreement to repurchase	18,635,215	24,054,730
Federal Home Loan Bank advances and other borrowings	72,040,028	43,600,000
Accrued expenses and other liabilities	7,412,585	8,681,393
Total liabilities	1,814,745,395	1,514,918,842
Shareholders' equity:
Preferred stock - $1 par value; 2,000,000 shares authorized; None issued and outstanding as of June 30,2018 and December 31,2017	0	0
Common stock - $1 par value; 40,000,000 shares authorized; 12,704,581 and 11,152,561 shares issued and outstanding in 2018 and 2017, respectively	12,704,581	11,152,561
Additional paid-in capital	208,512,862	174,008,753
Retained earnings	29,234,901	21,888,575
Accumulated other comprehensive loss	(2,965,767)	(1,198,049)
Total shareholders' equity	247,486,577	205,851,840
Total liabilities and shareholders' equity	$ 2,062,231,972	$ 1,720,770,682

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for loan losses (in dollars)	$ 7,073,937	$ 5,860,291
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	12,704,581	11,152,561
Common stock, shares outstanding (in shares)	12,704,581	11,152,561

CONSOLIDATED STATEMENTS OF INCOME - USD ($)	3 Months Ended		6 Months Ended
CONSOLIDATED STATEMENTS OF INCOME - USD ($)	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
INTEREST INCOME
Loans, including fees	$ 21,652,221	$ 10,747,217	$ 39,880,101	$ 20,962,823
Securities and interest-bearing deposits at other financial institutions	1,197,577	692,223	2,246,933	1,353,043
Federal funds sold and other earning assets	143,586	78,049	244,404	150,946
Total interest income	22,993,384	11,517,489	42,371,438	22,466,812
INTEREST EXPENSE
Deposits	3,237,891	1,241,551	5,639,354	2,339,089
Securities sold under agreements to repurchase	10,913	15,588	23,408	31,539
Federal Home Loan Bank advances and other borrowings	206,558	11,682	359,334	27,156
Total interest expense	3,455,362	1,268,821	6,022,096	2,397,784
Net interest income before provision for loan losses	19,538,022	10,248,668	36,349,342	20,069,028
Provision for loan losses	616,602	298,033	1,305,397	310,482
Net interest income after provision for loan losses	18,921,420	9,950,635	35,043,945	19,758,546
NONINTEREST INCOME
Customer service fees	556,891	290,626	1,134,894	555,299
Loss on sale of securities	(1,200)	0	(1,200)	0
Gain on sale of loans and other assets	321,584	405,418	646,928	680,583
Interchange and debit card transaction fees	121,219	223,329	266,754	415,722
Other noninterest income	578,715	332,634	985,025	542,674
Total noninterest income	1,577,209	1,252,007	3,032,401	2,194,278
NONINTEREST EXPENSES
Salaries and employee benefits	7,648,556	4,757,618	14,824,901	9,404,367
Net occupancy and equipment expense	1,521,687	962,593	3,055,100	1,941,052
Depository insurance	317,409	60,987	419,213	214,286
Sale of foreclosed assets and related expense	239,634	11,508	429,061	25,585
Advertising	214,632	129,398	399,107	293,659
Data processing	600,448	475,343	1,126,756	808,558
Professional services	918,135	473,351	1,816,495	1,043,192
Amortization of intangible assets	228,866	61,071	416,623	113,648
Service contracts	491,774	312,905	970,381	608,534
Merger expenses	1,122,976	419,992	1,620,716	419,992
Other operating expenses	1,968,249	1,163,896	3,416,505	2,116,265
Total noninterest expenses	15,272,366	8,828,662	28,494,858	16,989,138
Income before income tax expense	5,226,263	2,373,980	9,581,488	4,963,686
Income tax expense	1,294,707	725,694	2,235,162	1,671,548
Net income	3,931,556	1,648,286	7,346,326	3,292,138
Preferred stock dividends	0	0	0	195,000
Net income available to common shareholders	$ 3,931,556	$ 1,648,286	$ 7,346,326	$ 3,097,138
EARNINGS PER COMMON SHARE
Basic (in dollars per share)	$ 0.32	$ 0.20	$ 0.63	$ 0.39
Diluted (in dollars per share)	$ 0.32	$ 0.20	$ 0.62	$ 0.39
Weighted average common shares outstanding
Basic (in shares)	12,201,185	8,216,567	11,708,746	7,872,609
Diluted (in shares)	12,320,498	8,325,538	11,822,497	7,977,282

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income available to common shareholders	$ 3,931,556	$ 1,648,286	$ 7,346,326	$ 3,292,138
Other comprehensive (loss) income, net of tax:
Unrealized holding gains (losses) on securities arising during the period, net of tax (benefit) expense of $(134,439), $(580,433), $468,293 and $270,461 in 2018 and 2017, respectively	(397,244)	435,890	(1,768,638)	754,724
Reclassification adjustment for losses included in net income, net of tax (benefit) of $(280) and $0 in 2018 and 2017, respectively	920	0	920	0
Total other comprehensive (loss) income	(396,324)	435,890	(1,767,718)	754,724
Comprehensive income	$ 3,535,232	$ 2,084,176	$ 5,578,608	$ 4,046,862

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Unrealized holding gains arising during the period, tax expense (benefit)	$ (134,439)	$ 270,461	$ (580,433)	$ 468,293
Reclassification adjustment for losses included in net income, tax expense	$ (280)	$ 0	$ (280)	$ 0

CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - UNAUDITED - USD ($)	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
BALANCE at Dec. 31, 2016	$ 105,240,140	$ 12,000	$ 5,896,033	$ 83,463,051	$ 16,871,296	$ (1,002,240)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income available to common shareholders	3,292,138				3,292,138
Other comprehensive loss	754,724					754,724
Issuance of common stock	32,934,676		1,840,000	31,094,676
Issuance of stock grants	31,791		1,511	30,280
Exercise of stock options	4,625,012		481,717	4,143,295
Cash dividends on preferred stock	(195,000)				(195,000)
Redemption of preferred stock	(12,000,000)	(12,000)		(11,988,000)
Stock option compensation expense	50,530			50,530
BALANCE at Jun. 30, 2017	134,734,011	$ 0	8,219,261	106,793,832	19,968,434	(247,516)
BALANCE at Dec. 31, 2017	205,851,840		11,152,561	174,008,753	21,888,575	(1,198,049)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income available to common shareholders	7,346,326				7,346,326
Other comprehensive loss	(1,767,718)					(1,767,718)
Issuance of common stock	34,731,922		1,458,981	33,272,941
Issuance of stock grants	9,062		394	8,668
Exercise of stock options	1,070,917		92,645	978,272
Stock option compensation expense	244,228			244,228
BALANCE at Jun. 30, 2018	$ 247,486,577		$ 12,704,581	$ 208,512,862	$ 29,234,901	$ (2,965,767)

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income available to common shareholders	$ 7,346,326	$ 3,292,138
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,907,969	1,165,930
Provision for loan losses	1,305,397	310,482
Stock option compensation expense	244,228	50,530
Loss from redemption of securities	1,200	0
Net gains from sale of loans and other assets	(646,928)	(680,583)
Net losses from sale of foreclosed assets	371,734	15,064
Changes in other assets and liabilities:
Accrued interest receivable	(250,228)	18,144
Accrued interest payable	48,400	13,117
Other assets and liabilities	1,869,609	1,457,176
Net cash provided by operating activities	12,197,707	5,641,998
CASH FLOWS FROM INVESTING ACTIVITIES, net of acquisitions
Proceeds from sales, maturities, and paydowns of securities available-for-sale	34,524,629	10,062,386
Purchase of securities	(17,239,649)	(12,507,860)
Purchase of bank owned life insurance	0	(10,070,914)
Purchase of restricted investments	(1,377,600)	(452,750)
Net cash and cash equivalents received (paid) in business combination	5,653,304	(1,049,878)
Loan originations and principal collections, net	(73,194,598)	(27,248,001)
Purchase of bank premises and equipment	(992,045)	(1,226,898)
Proceeds from sale of foreclosed assets	2,126,213	41,636
Net cash used in investing activities	(50,499,746)	(42,452,279)
CASH FLOWS FROM FINANCING ACTIVITIES, net of acquisitions
Net increase in deposits	75,409,773	47,682,310
Net decrease in securities sold under agreements to repurchase	(5,419,515)	(3,676,000)
Issuance of common stock	1,079,979	37,591,479
Redemption of preferred stock	0	(12,000,000)
Payment of dividends on preferred stock	0	(195,000)
Proceeds from Federal Home Loan Bank advances and other borrowings	127,040,028	79,268,072
Repayment of Federal Home Loan Bank advances and other borrowings	(102,600,000)	(97,773,462)
Net cash provided by financing activities	95,510,265	50,897,399
NET INCREASE IN CASH AND CASH EQUIVALENTS	57,208,226	14,087,118
CASH AND CASH EQUIVALENTS, beginning of year	113,026,884	68,748,308
CASH AND CASH EQUIVALENTS, end of period	170,235,110	82,835,426
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid during the period for interest	5,973,696	2,374,250
Cash paid during the period for income taxes	713,000	1,366,172
NONCASH INVESTING AND FINANCING ACTIVITIES
Change in unrealized losses on securities available for sale	2,347,870	(1,223,017)
Acquisition of real estate through foreclosure	2,350,853	39,517
Financed sales of foreclosed assets	257,416	0
Change in goodwill due to acquisition	$ 15,739,261	$ 0

Presentation of Financial Information	6 Months Ended
Presentation of Financial Information	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Presentation of Financial Information	Presentation of Financial Information Nature of Business: SmartFinancial, Inc. (the “Company”) is a bank holding company whose principal activity is the ownership and management of its wholly-owned subsidiary, SmartBank (the “Bank”). The Company provides a variety of financial services to individuals and corporate customers through its offices in eastern Tennessee, Alabama, Florida, and Georgia. The Company’s primary deposit products are interest-bearing demand deposits and time deposits. Its primary lending products are commercial, residential, and consumer loans. On May 22, 2017, the Company along with the Bank entered into an agreement and plan of merger with Capstone Bancshares, Inc., an Alabama corporation and Capstone Bank, an Alabama-chartered commercial bank and wholly owned subsidiary of Capstone Bancshares, Inc. which became effective on November 1, 2017. On December 12, 2017, the Company along with the Bank entered into an agreement and plan of merger with Tennessee Bancshares, Inc., a Tennessee corporation and Southern Community Bank, a Tennessee-chartered commercial bank and wholly owned subsidiary of Tennessee Bancshares which became effective on May 1, 2018. Interim Financial Information (Unaudited): The financial information in this report for June 30, 2018 and June 30, 2017 has not been audited. The information included herein should be read in conjunction with the Company’s annual consolidated financial statements and footnotes included in the Company's most recent Annual Report on Form 10-K. The consolidated financial statements presented herein conform to U.S. generally accepted accounting principles and to general industry practices. In the opinion of SmartFinancial’s management, the accompanying interim financial statements contain all material adjustments necessary to present fairly the financial condition, the results of operations, and cash flows for the interim period. Results for interim periods are not necessarily indicative of the results to be expected for a full year. Basis of Presentation and Accounting Estimates: All adjustments consisting of normal recurring accruals, that in the opinion of management, are necessary for a fair presentation of the financial position and the results of operations for the periods covered by the report have been included. The accompanying unaudited consolidated financial statements and related notes should be read in conjunction with those appearing in the most recent Annual Report previously filed on Form 10-K. The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary. All significant intercompany balances and transactions have been eliminated in consolidation. In preparing the consolidated financial statements in conformity with accounting principles generally accepted in the U.S, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet, and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses, the valuation of foreclosed assets and deferred taxes, other-than-temporary impairments of securities, and the fair value of financial instruments. The determination of the adequacy of the allowance for loan losses is based on estimates that are particularly susceptible to significant changes in the economic environment and market conditions. In connection with the determination of the estimated losses on loans, management obtains independent appraisals for significant collateral. The Company’s loans are generally secured by specific items of collateral including real property, consumer assets, and business assets. Although the Company has a diversified loan portfolio, a substantial portion of its debtors’ ability to honor their contracts is dependent on local economic conditions. While management uses available information to recognize losses on loans, further reductions in the carrying amounts of loans may be necessary based on changes in local economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review the estimated losses on loans. Such agencies may require the Company to recognize additional losses based on their judgments about information available to them at the time of their examination. Because of these factors, it is reasonably possible that the estimated losses on loans may change materially in the near term. However, the amount of the change that is reasonably possible cannot be estimated. Note 1. Presentation of Financial Information, Continued Accounting Changes: We adopted ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)” and its related amendments as of January 1, 2018 utilizing the modified retrospective approach. The implementation of the new standard did not have a material impact on the measurement or recognition of revenue; as such, a cumulative effect adjustment to opening retained earnings was not deemed necessary. Since the guidance does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other GAAP, the new guidance did not have a material impact on revenue most closely associated with financial instruments, including interest income and expense. The Company completed its overall assessment of revenue streams and review of related contracts potentially affected by the ASU, including, deposit related fees, interchange fees, merchant income, and insurance and brokerage commissions. Based on this assessment, the Company concluded that ASU 2014-09 did not materially change the method in which the Company currently recognizes revenue for these revenue streams. Under ASU 2014-09, we adopted new policies related to revenue recognition. In general, for revenue not associated with financial instruments, guarantees and lease contracts, we apply the following steps when recognizing revenue from contracts with customers: (i) identify the contract, (ii) identify the performance obligations, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations and (v) recognize revenue when performance obligation is satisfied. Our contracts with customers are generally short term in nature, typically due within one year or less or cancellable by us or our customer upon a short notice period. Performance obligations for our customer contracts are generally satisfied at a single point in time, typically when the transaction is complete, or over time. For performance obligations satisfied over time, we primarily use the output method, directly measuring the value of the products/services transferred to the customer, to determine when performance obligations have been satisfied. We typically receive payment from customers and recognize revenue concurrent with the satisfaction of our performance obligations. In most cases, this occurs within a single financial reporting period. For payments received in advance of the satisfaction of performance obligations, revenue recognition is deferred until such time the performance obligations have been satisfied. In cases where we have not received payment despite satisfaction of our performance obligations, we accrue an estimate of the amount due in the period our performance obligations have been satisfied. For contracts with variable components, only amounts for which collection is probable are accrued. We generally act in a principal capacity, on our own behalf, in most of our contracts with customers. In such transactions, we recognize revenue and the related costs to provide our services on a gross basis in our financial statements. In some cases, we act in an agent capacity, deriving revenue through assisting other entities in transactions with our customers. In such transactions, we recognized revenue and the related costs to provide our services on a net basis in our financial statements. These transactions relate to our customers' use of various interchange and ATM/debit card networks. Based on our underlying contracts, ASU 2014-09 requires us to report network costs associated with debit card and ATM transactions netted against the related fees from such transactions. Previously, such network costs were reported as a component of other noninterest expense. For the three and six months periods ended June 30, 2018, gross interchange and debit card transaction fees totaled $401 thousand and $733 thousand, respectively while related network costs totaled $280 thousand and $467 thousand, respectively. On a net basis, we reported $121 thousand and $267 thousand as interchange and debit card transaction fees in the accompanying Consolidated Statement of Income for the three and six months periods ended June 30, 2018. For the three and six months periods ended June 30, 2017, we reported interchange and debit card transaction fees totaling $223 thousand and $416 thousand, respectively on a gross basis in the accompanying Consolidated Statement of Income while related network costs totaling $140 thousand and $227 thousand, respectively were reported in other operating expenses included as a component of other noninterest expense. ASU 2016-01 "Financial Instruments - Overall (Subtopic 825-10): Recognition of Financial Assets and Financial Liabilities, ("ASU 2016-01") makes targeted amendments to the guidance for recognition, measurement, presentation and disclosure of financial instruments. ASU 2016-01 requires equity investments, other than equity method investments, to be measured at fair value with changes in fair value recognized in net income. The ASU requires a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption to reclassify the cumulative change in fair value of equity securities previously recognized in Accumulated Other Comprehensive Income. ASU 2016-01 became effective for the Company on January 1, 2018 and there was no adjustment to retained earnings. ASU 2016-01 also emphasizes the existing requirement to use exit prices to measure fair value for disclosure purposes and clarifies that entities should not make use of a practicability exception in determining the fair value of loans. Accordingly, we refined the calculation used to determine the disclosed fair value of our loans held for investment portfolio as part of adopting this standard. The refined calculation is disclosed Note 6 - Fair Value Disclosures. Note 1. Presentation of Financial Information, Continued Accounting Changes (continued): In February 2018, the FASB issued ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income; (“ASU 2018-02”). ASU 2018-02 amends ASC Topic 220 and allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (“Tax Reform Act”). Consequently, this amendment eliminates the stranded tax effects resulting from the Tax Reform Act and will improve the usefulness of information reported to financial statement users. However, because the amendments only related to the reclassification of the income tax effects of the Tax Reform Act, the underlying guidance that requires that the effects of the change in tax laws or rates be included in income from continuing operations is not affected. The guidance is effective for public companies for annual periods beginning on or after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period, (1) for public business entities for reporting periods for which financial statements have not yet been issued and (2) for all other entities for reporting periods for which financial statements have not yet been made available for issuance. This amendment should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in U.S. federal corporate income tax rate in the Tax Reform Act is recognized. The Company early adopted this amendment in the fourth quarter of 2017 and reclassified $197 thousand from accumulated other comprehensive income to retained earnings for the stranded tax effects resulting from the Tax Reform Act. Recently Issued Accounting Pronouncements: During interim periods, the Company follows the accounting policies set forth in its annual audited financial statements for the year ended December 31, 2017 as filed with the Securities and Exchange Commission. The following is a summary of recent authoritative pronouncements not yet effective that could impact the accounting, reporting, and/or disclosure of financial information by the Company issued since December 31, 2017. In February 2016, the FASB issued guidance that requires lessees to recognize almost all leases on their balance sheet as a right-of-use asset and a lease liability in ASU 2016-2: Leases (Topic 842). For income statement purposes, the FASB retained a dual model, requiring leases to be classified as either operating or finance. Classification will be based on criteria that are largely similar to those applied in current lease accounting, but without explicit bright lines. Lessor accounting is similar to the current model, but updated to align with certain changes to the lessee model and the new revenue recognition standard. Existing sale-leaseback guidance, including guidance for real estate, is replaced with a new model applicable to both lessees and lessors. The new guidance will be effective for public business entities for annual periods beginning after December 15, 2018 including interim periods within those fiscal years. The Company has several lease agreements, such as branch locations, which are currently considered operating leases, and therefore, not recognized on the Company’s consolidated statements of condition. The Company expects the new guidance will require these lease agreements to be recognized on the consolidated statements of condition as a right-of-use asset and a corresponding lease liability. Therefore, the Company’s preliminary evaluation indicates the provisions of ASU No. 2016-02 are expected to impact the Company’s consolidated statements of condition, along with our regulatory capital ratios. However, the Company continues to evaluate the extent of potential impact the new guidance will have on the Company’s consolidated financial statements. The Company is in the process of identifying a complete inventory of arrangements containing a lease and accumulating the lease data necessary to apply the amended guidance. In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842) Land Easement Practical Expedient Transition to Topic 842 , an amendment to ASU 2016-2: Leases. The amendments in this Update permit an entity to elect an optional transition practical expedient to not evaluate under Topic 842 land easements that exist or expired before the entity’s adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. An entity that elects this practical expedient should apply the practical expedient consistently to all of its existing or expired land easements that were not previously accounted for as leases under Topic 840. Once an entity adopts Topic 842, it should apply that Topic prospectively to all new (or modified) land easements to determine whether the arrangement should be accounted for as a lease. An entity that does not elect this practical expedient should evaluate all existing or expired land easements in connection with the adoption of the new lease requirements in Topic 842 to assess whether they meet the definition of a lease. An entity should continue to apply its current accounting policy for accounting for land easements that existed before the entity’s adoption of Topic 842. For example, if an entity currently accounts for certain land easements as leases under Topic 840, it should continue to account for those land easements as leases before its adoption of Topic 842. The effective date and transition requirements for the amendments are the same as the effective date and transition requirements in Update 2016-02, for which the company is currently evaluating the impact. Note 1. Presentation of Financial Information, Continued Recently Issued Accounting Pronouncements (continued): In June 2016, FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU changed the credit loss model on financial instruments measured at amortized cost, available for sale securities and certain purchased financial instruments. Credit losses on financial instruments measured at amortized cost will be determined using a current expected credit loss model which requires the Company to measure all expected credit losses for financial instruments held at the reporting date based on historical experience, current conditions, and reasonable supportable forecasts. This replaces the existing incurred loss model and is applicable to the measurement of credit losses on financial assets measured at amortized cost and applies to some off-balance sheet credit exposures. Purchased financial assets with more-than-insignificant credit deterioration since origination ("PCD assets" which are currently named "PCI Loans") measured at amortized cost will have an allowance for credit losses established at acquisition as part of the purchase price. Subsequent increases or decreases to the allowance for credit losses on PCD assets will be recognized in the income statement. Interest income should be recognized on PCD assets based on the effective interest rate, determined excluding the discount attributed to credit losses at acquisition. Credit losses relating to available-for-sale debt securities will be recognized through an allowance for credit losses. The amount of the credit loss is limited to the amount by which fair value is below amortized cost of the available-for-sale debt security. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years for the Company and other SEC filers. Early adoption is permitted and if early adopted, all provisions must be adopted in the same period. The amendments should be applied through a cumulative-effect adjustment to retained earnings as of the beginning of the period adopted. A prospective approach is required for securities with other than temporary impairment recognized prior to adoption. The Company is continuing its implementation efforts through its Company-wide implementation team. The implementation team meets periodically to discuss the latest developments and ensure progress is being made. The team also keeps current on evolving interpretations and industry practices related to ASU 2016-13 via webcasts, publications, conferences, and peer bank meetings. The team continues to evaluate and validate data resources and different loss methodologies. The Company’s preliminary evaluation indicates the provisions of ASU No. 2016-13 are expected to impact the Company’s consolidated financial statements, in particular an increase to the level of the reserve for credit losses. However, the Company continues to evaluate the extent of the potential impact. In January 2017, FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The ASU simplifies the subsequent measurement of goodwill and eliminates Step 2 from the goodwill impairment test. The Company should perform its goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit's fair value. The impairment charge is limited to the amount of goodwill allocated to that reporting unit. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The Company does not expect these amendments to have a material effect on its consolidated financial statements. In March 2017, FASB issued ASU No. 2017-08, Receivables - Nonrefundable Fees and Other Costs (Topic 310-20): Premium Amortization on Purchased Callable Debt Securities. The ASU shortens the amortization period for certain callable debt securities held at a premium. The premium on individual callable debt securities shall be amortized to the earliest call date. This guidance does not apply to securities for which prepayments are estimated on a large number of similar loans where prepayments are probable and reasonably estimable. The amendments in this update are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. This update should be adopted on a modified retrospective basis with a cumulative-effect adjustment to retained earnings on the date of adoption. The Company does not expect these amendments to have a material effect on its consolidated financial statements. In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities, which amends the hedge accounting recognition and presentation requirements in Accounting Standards Codification (ASC) 815, Derivatives and Hedging. The goals of the ASU are to (1) improve the transparency and understandability of information conveyed to financial statement users about an entity’s risk management activities by better aligning the entity’s financial reporting for hedging relationships with those risk management activities and (2) reduce the complexity of and simplify the application of hedge accounting by preparers. The amendments will be effective for the Company for interim and annual periods beginning after December 15, 2018. The Company does not expect these amendments to have a material effect on its consolidated financial statements. Note 1. Presentation of Financial Information, Continued As part of its Simplification Initiative, the FASB has issued (ASU) No. 2018-07, Compensation-Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting. ASU No. 2018-07 expands the scope of Topic 718, Compensation-Stock Compensation (which previously only included payments to employees), to include share-based payment transactions for acquiring goods and services from non-employees. This required entities to apply the requirements of Topic 718 to non-employee awards, except for specific guidance on inputs to an option pricing model and the attribution of cost (i.e., the period of time over which share-based payment awards vest and the pattern of cost recognition over that period). Additionally, the amendments specify that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in the grantor’s own operations by issuing share-based payment awards, and clarify that Topic 718 does not apply to share-based payments used to effectively provide (1) financing to the issuer, or (2) awards granted in conjunction with selling goods or services to customers as part of a contract accounted for under Topic 606, Revenue from Contracts with Customers. The amendments are effective for fiscal years beginning after December 15, 2018, and for the interim periods within those years. The Company does not expect these amendments to have a material effect on its consolidated financial statements. Reclassifications: Certain captions and amounts in the 2017 consolidated financial statements were reclassified to conform to the 2018 presentation and these reclassifications had no impact on net income or equity as previously reported. Earnings per common share: Basic earnings per common share represents income available to common shareholders divided by the weighted-average number of common shares outstanding during the period. Diluted earnings per common share reflects additional common shares that would have been outstanding if dilutive potential common shares had been issued, as well as any adjustment to income that would result from the assumed issuance (excluding tax impact). Potential common shares that may be issued by the Company relate solely to outstanding stock options, determined using the treasury stock method, and restricted stock awards, determined by the fair value of the Company's stock on date of grant.

Business Combination

6 Months Ended

Jun. 30, 2018

Business Combinations [Abstract]

Business Combination

Acquisition of branch from Atlantic Capital Bank, N.A.

On December 8, 2016, the Bank entered into a purchase and assumption agreement with Atlantic Capital Bank, N.A. that provided for the acquisition and assumption by the Bank of certain assets and liabilities associated with Atlantic Capital Bank’s branch office located at 3200 Keith Street NW, Cleveland, Tennessee 37312. The purchase was completed on May 19, 2017 for total cash consideration of $1.2 million. The assets and liabilities as of the effective date of the transaction were recorded at their respective estimated fair values. The excess of the purchase price over the net estimated fair values of the acquired assets and liabilities was allocated to identifiable intangible assets with the remaining excess allocated to goodwill. In the periods following the acquisition, the financial statements will include the results attributable to the Cleveland branch purchase beginning on the date of purchase. For the three and six months period ended June 30, 2018, the revenues attributable to the Cleveland branch were $381 thousand and $754 thousand, respectively. For the three and six months period ended June 30, 2018, net income attributable to the Cleveland branch was a net income of $105 thousand and net income of $194 thousand, respectively. It is impracticable to determine the pro-forma impact to the 2017 revenues and net income if the acquisition had occurred on January 1, 2017 as the Company does not have access to those records for a single branch.

Note 2. Business Combination, Continued

The following table details the financial impact of the transaction, including the allocation of the purchase price to the fair values of net assets assumed and goodwill recognized:



Allocation of Purchase Price (in thousands)
Total consideration in cash	$	1,183
Fair value of assets acquired and liabilities assumed:
Cash and cash equivalents	133
Loans	24,073
Premises and equipment	2,839
Core deposit intangible	310
Prepaid and other assets	77
Deposits	(26,888		)
Payables and other liabilities	(21		)
Total fair value of net assets acquired	523
Goodwill	$	660

As of June 30, 2018 there have not been any changes to the initial fair values recorded as part of the business combination.

Acquisition of Capstone Bancshares, Inc.

On May 22, 2017, the shareholders of the Company approved a merger with Capstone Bancshares, Inc. ("Capstone"), the one bank holding company of Capstone Bank, which became effective November 1, 2017. Capstone shareholders received either: (a) 0.85 shares of common stock, (b) $18.50 in cash, or (c) a combination of 80% common stock and 20% cash. Elections were limited by the requirement that 80% of the total shares of Capstone common stock be exchanged for common stock and 20% be exchanged for cash. Therefore, the allocation of common stock and cash that a Capstone shareholder received depended on the elections of other Capstone shareholders, and were allocated in accordance with the procedures set forth in the merger agreement. Capstone shareholders also received cash instead of any fractional shares they would have otherwise received in the merger.

After the merger, shareholders of SmartFinancial owned approximately 74% of the outstanding common stock of the combined entity on a fully diluted basis, after taking into account the exchange ratio.

The merger is being accounted for using the acquisition method of accounting, in accordance with the provisions of FASB ASC 805-10 Business Combinations. Under this guidance, for accounting purposes, the Company is considered the acquirer in the merger, and as a result the historical financial statements of the combined entity are the historical consolidated financial statements of the Company.

The merger was effected by the issuance of shares of SmartFinancial stock along with cash consideration to shareholders of Capstone. The assets and liabilities of Capstone as of the effective date of the merger were recorded at their respective estimated fair values and combined with those of SmartFinancial. The excess of the purchase price over the net estimated fair values of the acquired assets and liabilities was allocated to identifiable intangible assets with the remaining excess allocated to goodwill. Goodwill from the transaction was $38.0 million, none of which is deductible for income tax purposes.

In periods following the merger, the financial statements of the combined entity will include the results attributable to Capstone beginning on the date the merger was completed. In the three and six month period ended June 30, 2018, the revenues attributable to Capstone were approximately $7.6 million and $14.5 million. In the three and six month period ended June 30, 2018, the net income attributable to Capstone was approximately $3.4 million and $6.0 million, respectively.

Note 2. Business Combination, Continued

The pro-forma impact to 2017 revenues if the merger had occurred on December 31, 2016 would have been $6.2 million and $12.5 million for the three and six month period ending June 30, 2017, respectively. The pro-forma impact to 2017 net income if the merger had occurred on December 31, 2016 would have been $237 thousand and $473 thousand for the three and six month period ending June 30, 2017, respectively. While certain adjustments were made for the estimated impact of certain fair value adjustments, they are not indicative of what would have occurred had the merger taken place on the indicated date nor are they intended to represent or be indicative of future results of operations. In particular, no adjustments have been made to eliminate the amount of Capstone's provision for credit losses not have been necessary or any adjustments to estimate any additional income that would have been recorded as a result of fair value adjustments for the first six months of 2017 that may have occurred had the acquired loans been recorded at fair value as of the beginning of 2017. In addition there are no adjustments to reflect any expenses that potentially could have been reduced for the first six months of 2017 had the merger occurred on December 31, 2016. There were $4.6 million in nonrecurring pro forma adjustments to expense included in the reported proforma revenue and earnings.

The fair value estimates of Capstone’s assets and liabilities recorded are preliminary and subject to refinement as additional information becomes available. Under current accounting principles, the Company’s estimates of fair values may be adjusted for a period of up to one year from the acquisition date. As of June 30, 2018 there was a $11 thousand adjustment to reduce fair values initially recorded as part of the business combination.

The following table details the financial impact of the merger, including the calculation of the purchase price, the allocation of the purchase price to the fair values of net assets assumed, and goodwill recognized:



Calculation of Purchase Price
Shares of SMBK common stock issued to Capstone shareholders as of November 1, 2017	2,908,094
Market price of SMBK common stock on November 1, 2017	$	23.49
Estimated fair value of SMBK common stock issued (in thousands)	68,311
Estimated fair value of Capstone stock options (in thousands)	1,585
Cash consideration paid	15,826
Total consideration (in thousands)	$	85,722



Allocation of Purchase Price (in thousands)
Total consideration above	$	85,722
Fair value of assets acquired and liabilities assumed:
Cash and cash equivalents	16,810
Investment securities available for sale	51,638
Restricted investments	1,049
Loans	413,023
Premises and equipment	8,668
Bank owned life insurance	10,031
Core deposit intangible	5,530
Other real estate owned	410
Prepaid and other assets	6,360
Deposits	(454,154		)
FHLB advances and other borrowings	(4,887		)
Payables and other liabilities	(6,803		)
Total fair value of net assets acquired	47,675
Goodwill	$	38,047

Note 2. Business Combination, Continued

Acquisition of Tennessee Bancshares, Inc.

On May 1, 2018, the Company completed its merger with Tennessee Bancshares, Inc., a Tennessee corporation (“Tennessee Bancshares”), pursuant to an Agreement and Plan of Merger dated December 12, 2017 (the “Tennessee Bancshares merger agreement”), by and among SmartFinancial, Tennessee Bancshares, and Southern Community Bank, a Tennessee-chartered commercial bank and wholly owned subsidiary of Tennessee Bancshares. Tennessee Bancshares merged with and into SmartFinancial, with SmartFinancial continuing as the surviving corporation. Immediately following the merger, Southern Community Bank merged with and into the Bank continuing as the surviving banking corporation.

Pursuant to the Tennessee Bancshares merger agreement, each outstanding share of Tennessee Bancshares common stock was converted into and cancelled in exchange for 0.8065 shares of SmartFinancial common stock.. SmartFinancial issued approximately 1,458,981 shares of SmartFinancial common stock as consideration for the merger. SmartFinancial did not issue fractional shares of its common stock in connection with the merger, but instead paid cash in lieu of fractional shares based on the volume weighted average closing price of SmartFinancial common stock on the Nasdaq Capital Market for the 10 consecutive trading days ending on (and including) April 27, 2018 (calculated as $23.92).

After the merger, shareholders of SmartFinancial owned approximately 88.6% of the outstanding common stock of the combined entity on a fully diluted basis, after taking into account the exchange ratio.

The merger with Tennessee Bancshares is being accounted for using the acquisition method of accounting, in accordance with the provisions of FASB ASC 805-10 Business Combinations. Under this guidance, for accounting purposes, the Company is considered the acquirer in the merger, and as a result the historical financial statements of the combined entity are the historical consolidated financial statements of the Company.

The merger was effected by the issuance of shares of SmartFinancial stock along with cash consideration to the fractional shareholders of Tennessee Bancshares, Inc. The assets and liabilities of Tennessee Bancshares as of the effective date of the merger were recorded at their respective estimated fair values and combined with those of SmartFinancial. The excess of the purchase price over the net estimated fair values of the acquired assets and liabilities was allocated to identifiable intangible assets with the remaining excess allocated to goodwill. Goodwill from the transaction was $15.7 million, none of which is deductible for income tax purposes.

In periods following the Tennessee Bancshares merger, the financial statements of the combined entity will include the results attributable to Southern Community Bank beginning on the date the merger was completed. In the three and six months period ended June 30, 2018, the revenues and net income attributable to Southern Community Bank were approximately $2.4 million and $800 thousand, respectively.

The pro-forma impact to 2017 revenues if the merger had occurred on December 31, 2016 would have been $3.7 million and $7.3 million for the three and six month period ending June 30, 2017, respectively. The pro-forma impact to 2017 net income if the merger had occurred on December 31, 2016 would have been $909 thousand and $1.8 million for the three and six month period ending June 30, 2017, respectively.

While certain adjustments were made for the estimated impact of certain fair value adjustments, they are not indicative of what would have occurred had the merger taken place on the indicated date nor are they intended to represent or be indicative of future results of operations. In particular, no adjustments have been made to eliminate the amount of Southern Community Bank's provision for credit losses not have been necessary or any adjustments to estimate any additional income that would have been recorded as a result of fair value adjustments for the first six months of 2017 that may have occurred had the acquired loans been recorded at fair value as of the beginning of 2017. In addition there are no adjustments to reflect any expenses that potentially could have been reduced for the first six months of 2017 had the merger occurred on December 31, 2016. There were $1.3 million nonrecurring pro forma adjustments to expense included in the reported proforma earnings.

The fair value estimates of Tennessee Bancshares assets and liabilities recorded are preliminary and subject to refinement as additional information becomes available. Under current accounting principles, the Company’s estimates of fair values may be adjusted for a period of up to one year from the acquisition date. As of June 30, 2018 there were no adjustments to fair values initially recorded as part of the business combination.

Note 2. Business Combination, Continued

The following table details the financial impact of the merger, including the calculation of the purchase price, the allocation of the purchase price to the fair values of net assets assumed, and goodwill recognized:



Calculation of Purchase Price
Shares of SMBK common stock issued to TN Bancshares shareholders as of May 1, 2018	1,458,981
Market price of SMBK common stock on May 1, 2018	$	23.85
Estimated fair value of SMBK common stock issued (in thousands)	34,797
Cash consideration paid	5
Total consideration (in thousands)	$	34,802



Allocation of Purchase Price (in thousands)
Total consideration above	$	34,802
Fair value of assets acquired and liabilities assumed:
Cash and cash equivalents	5,723
Investment securities available for sale	24,563
Restricted investments	464
Loans	180,490
Premises and equipment	9,470
Core deposit intangible	2,290
Other real estate owned	674
Prepaid and other assets	2,258
Deposits	(202,272		)
FHLB advances and other borrowings	(4,000		)
Payables and other liabilities	(586		)
Total fair value of net assets acquired	19,074
Goodwill	$	15,728

Earnings per share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Earnings per share

The following is a summary of the basic and diluted earnings per share for the three and six months ended June 30, 2018 and 2017.



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Net income available to common shareholders	$	3,931,556	$	1,648,286	$	7,346,326	$	3,097,138
Weighted average common shares outstanding	12,201,185		8,216,567		11,708,746		7,872,609
Effect of dilutive stock options	119,313		108,971		113,751		104,673
Diluted shares	12,320,498		8,325,538		11,822,497		7,977,282
Basic earnings per common share	$	0.32	$	0.20	$	0.63	$	0.39
Diluted earnings per common share	$	0.32	$	0.20	$	0.62	$	0.39

For the three and six months ended June 30, 2018 and 2017, the effects of outstanding antidilutive stock options are excluded from the computation of diluted earnings per common share because the exercise price of such options is higher than the market price. There were no and 13,916 antidilutive stock options for the three and six months ended June 30, 2018 and 2017

Securities

6 Months Ended

Jun. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Securities

The amortized cost and fair value of securities available-for-sale at June 30, 2018 and December 31, 2017 are summarized as follows (in thousands):



	June 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Government-sponsored enterprises (GSEs)	$	29,137	$	—	$	(1,009	)	$	28,128
Municipal securities	15,896		8		(320		)	15,584
Other debt securities	976		—		(65		)	911
Mortgage-backed securities (GSEs)	114,538		171		(2,755		)	111,954
	$	160,547	$	179	$	(4,149	)	$	156,577



	December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Government-sponsored enterprises (GSEs)	$	26,207	$	1	$	(432	)	$	25,776
Municipal securities	9,122		28		(147		)	9,003
Other debt securities	974		—		(24		)	950
Mortgage-backed securities (GSEs)	117,263		136		(1,184		)	116,215
	$	153,566	$	165	$	(1,787	)	$	151,944

At June 30, 2018 and December 31, 2017, securities with a fair value totaling approximately $113.5 million and $97.2 million, respectively were pledged to secure public funds and securities sold under agreements to repurchase.

For the three and six months ended June 30, 2018 and June 30, 2017, there were no available-for-sale securities sold. For the three and six months ended June 30, 2018, a security was called for less than the amortized cost resulting in a realized loss of $1,200.

The amortized cost and estimated fair value of securities at June 30, 2018, by contractual maturity for non-mortgage backed securities, are shown below (in thousands). Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.



	Amortized Cost		Fair Value
Due in one year or less	$	—	$	—
Due from one year to five years	21,554		20,901
Due from five years to ten years	13,995		13,366
Due after ten years	10,460		10,356
	46,009		44,623
Mortgage-backed securities	114,538		111,954
	$	160,547	$	156,577

Note 4. Securities, Continued

The following tables present the gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities available-for-sale have been in a continuous unrealized loss position, as of June 30, 2018 and December 31, 2017 (in thousands):



	As of June 30, 2018
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
U.S. Government- sponsored enterprises (GSEs)	$	14,862	$	(425	)	$	13,266	$	(584	)	$	28,128	$	(1,009	)
Municipal securities	11,966		(182		)	2,072		(138		)	14,038		(320		)
Other debt securities	—		—			911		(65		)	911		(65		)
Mortgage-backed securities (GSEs)	58,377		(1,654		)	29,911		(1,101		)	88,288		(2,755		)
	$	85,205	$	(2,261	)	$	46,160	$	(1,888	)	$	131,365	$	(4,149	)



	As of December 31, 2017
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
U.S. Government- sponsored enterprises (GSEs)	$	1,358	$	(1	)	$	13,420	$	(431	)	$	14,778	$	(432	)
Municipal securities	3,418		(43		)	2,112		(104		)	5,530		(147		)
Other debt securities	950		(24		)	—		—			950		(24		)
Mortgage-backed securities (GSEs)	61,332		(407		)	35,048		(777		)	96,380		(1,184		)
	$	67,058	$	(475	)	$	50,580	$	(1,312	)	$	117,638	$	(1,787	)

At June 30, 2018, the categories of temporarily impaired securities, and management’s evaluation of those securities, are as follows:

U.S. Government-sponsored enterprises: At June 30, 2018, 8 (or eight) investments in U.S. GSE securities had unrealized losses. These unrealized losses related principally to changes in market interest rates. The contractual terms of the investments do not permit the issuer to settle the securities at a price less than the amortized cost bases of the investments. Because the Bank does not intend to sell the investments and it is more likely than not that the Bank will not be required to sell the investments before recovery of their amortized cost bases, which may be maturity, the Bank does not consider these investments to be other-than temporarily impaired at June 30, 2018.

Municipal securities: At June 30, 2018, 21 (or twenty one) investments in obligations of municipal securities had unrealized losses. The Bank believes the unrealized losses on those investments were caused by the interest rate environment and do not relate to the underlying credit quality of the issuers. Because the Bank does not intend to sell the investments and it is not more likely than not that the Bank will be required to sell the investments before recovery of their amortized cost bases, which may be maturity, the Bank does not consider these investments to be other-than temporarily impaired at June 30, 2018.

Other debt securities: At June 30, 2018, 1 (or one) investment in other debt securities had unrealized losses. The Bank believes the unrealized loss on this investment was caused by the interest rate environment and does not relate to the underlying credit quality of the issuer. Because the Bank does not intend to sell the investment and it is not more likely than not that the Bank will be required to sell the investment before recovery of its amortized cost bases, which may be maturity, the Bank does not consider this investment to be other-than temporarily impaired at June 30, 2018.

Mortgage-backed securities: At June 30, 2018, 65 (or sixty five) investments in residential mortgage-backed securities had unrealized losses. This impairment is believed to be caused by the current interest rate environment. The contractual cash flows of those investments are guaranteed by an agency of the U.S. Government. Because the decline in market value is attributable to the current interest rate environment and not credit quality, and because the Bank does not intend to sell the investments and it is not more likely than not that the Bank will be required to sell the investments before recovery of their amortized cost bases, which may be maturity, the Bank does not deem these investments to be other-than-temporarily impaired at June 30, 2018.

Loans and Allowance for Loan Losses

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Loans and Allowance for Loan Losses

Portfolio Segmentation:

At June 30, 2018 and December 31, 2017, loans are summarized as follows (in thousands):



	June 30, 2018									December 31, 2017
	PCI Loans¹			All Other Loans			Total			PCI Loans¹			All Other Loans			Total
Commercial real estate	$	18,474		$	727,390		$	745,864		$	17,903		$	625,085		$	642,988
Consumer real estate	6,987			348,889			355,876			7,450			286,007			293,457
Construction and land development	5,690			173,741			179,431			5,120			130,289			135,409
Commercial and industrial	821			278,950			279,771			858			237,229			238,087
Consumer and other	686			13,807			14,493			1,463			11,854			13,317
Total loans	32,658			1,542,777			1,575,435			32,794			1,290,464			1,323,258
Less: Allowance for loan losses	(19		)	(7,055		)	(7,074		)	(16		)	(5,844		)	(5,860		)
Loans, net	$	32,639		$	1,535,722		$	1,568,361		$	32,778		$	1,284,620		$	1,317,398

¹ Purchased Credit Impaired loans (“PCI loans”) are loans with evidence of credit deterioration at purchase.

For purposes of the disclosures required pursuant to the adoption of ASC 310, the loan portfolio was disaggregated into segments. A portfolio segment is defined as the level at which an entity develops and documents a systematic method for determining its allowance for credit losses. There are five loan portfolio segments that include commercial real estate, consumer real estate, construction and land development, commercial and industrial, and consumer and other.

The following describe risk characteristics relevant to each of the portfolio segments:

Commercial Real Estate: Commercial real estate loans include owner-occupied commercial real estate loans and loans secured by income-producing properties. Owner-occupied commercial real estate loans to operating businesses are long-term financing of land and buildings. These loans are repaid by cash flow generated from the business operation. Real estate loans for income-producing properties such as apartment buildings, office and industrial buildings, and retail shopping centers are repaid from rent income derived from the properties. Loans within this portfolio segment are particularly sensitive to the valuation of real estate.

Consumer Real Estate: Consumer real estate loans include real estate loans secured by first liens, second liens, or open end real estate loans, such as home equity lines. These are repaid by various means such as a borrower's income, sale of the property, or rental income derived from the property. One to four family first mortgage loans are repaid by various means such as a borrower's income, sale of the property, or rental income derived from the property. Loans within this portfolio segment are particularly sensitive to the valuation of real estate.

Construction and Land Development: Loans for real estate construction and development are repaid through cash flow related to the operations, sale or refinance of the underlying property. This portfolio segment includes extensions of credit to real estate developers or investors where repayment is dependent on the sale of the real estate or income generated from the real estate collateral. Loans within this portfolio segment are particularly sensitive to the valuation of real estate.

Commercial and Industrial: The commercial and industrial loan portfolio segment includes commercial, financial, agricultural, and municipal loans. These loans include those loans to commercial customers for use in normal business operations to finance working capital needs, equipment purchases, or expansion projects. Loans are repaid by business cash flows. Collection risk in this portfolio is driven by the creditworthiness of the underlying borrower, particularly cash flows from the customers' business operations.

Consumer and Other: The consumer loan portfolio segment includes direct consumer installment loans, overdrafts and other revolving credit loans, educational loans, and other loans which do not fall into the categories above. Loans in this portfolio are sensitive to unemployment and other key consumer economic measures.

Note 5. Loans and Allowance for Loan Losses, Continued

Credit Risk Management:

The Company employs a credit risk management process with defined policies, accountability and routine reporting to manage credit risk in the loan portfolio segments. Credit risk management is guided by credit policies that provide for a consistent and prudent approach to underwriting and approvals of credits. Within the Credit Policy, procedures exist that elevate the approval requirements as credits become larger and more complex. All loans are individually underwritten, risk-rated, approved, and monitored.

Responsibility and accountability for adherence to underwriting policies and accurate risk ratings lies in each portfolio segment. For the consumer real estate and consumer and other portfolio segments, the risk management process focuses on managing customers who become delinquent in their payments. For the other portfolio segments, the risk management process focuses on underwriting new business and, on an ongoing basis, monitoring the credit of the portfolios, including a third party review of the largest credits on an annual basis or more frequently as needed. To ensure problem credits are identified on a timely basis, several specific portfolio reviews occur periodically to assess the larger adversely rated credits for proper risk rating and accrual status.

Credit quality and trends in the loan portfolio segments are measured and monitored regularly. Detailed reports, by product, collateral, accrual status, etc., are reviewed by the Senior Credit Officer and the Directors Loan Committee.

The allowance for loan losses is a valuation reserve allowance established through provisions for loan losses charged against income. The allowance for loan losses, which is evaluated quarterly, is maintained at a level that management deems sufficient to absorb probable losses inherent in the loan portfolio. Loans deemed to be uncollectible are charged against the allowance for loan losses, while recoveries of previously charged-off amounts are credited to the allowance for loan losses. The allowance for loan losses is comprised of specific valuation allowances for loans evaluated individually for impairment and general allocations for pools of homogeneous loans with similar risk characteristics and trends.

The allowance for loan losses related to specific loans is based on management's estimate of potential losses on impaired loans as determined by (1) the present value of expected future cash flows; (2) the fair value of collateral if the loan is determined to be collateral dependent or (3) the loan's observable market price. The Company's homogeneous loan pools include commercial real estate loans, consumer real estate loans, construction and land development loans, commercial and industrial loans, and consumer and other loans. The general allocations to these loan pools are based on the historical loss rates for specific loan types and the internal risk grade, if applicable, adjusted for both internal and external qualitative risk factors.

The qualitative factors considered by management include, among other factors, (1) changes in local and national economic conditions; (2) changes in asset quality; (3) changes in loan portfolio volume; (4) the composition and concentrations of credit; (5) the impact of competition on loan structuring and pricing; (6) the impact of interest rate changes on portfolio risk and (7) effectiveness of the Company's loan policies, procedures and internal controls. The total allowance established for each homogeneous loan pool represents the product of the historical loss ratio adjusted for qualitative factors and the total dollar amount of the loans in the pool.

Note 5. Loans and Allowance for Loan Losses, Continued

Credit Risk Management (continued):

The composition of loans by loan classification for impaired and performing loan status at June 30, 2018 and December 31, 2017, is summarized in the tables below (in thousands):



	June 30, 2018
	Commercial Real Estate		Consumer Real Estate		Construction and Land Development		Commercial and Industrial		Consumer and Other		Total
Performing loans	$	726,356	$	347,893	$	173,194	$	278,431	$	13,698	$	1,539,572
Impaired loans	1,034		996		547		519		109		3,205
	727,390		348,889		173,741		278,950		13,807		1,542,777
PCI loans	18,474		6,987		5,690		821		686		32,658
Total	$	745,864	$	355,876	$	179,431	$	279,771	$	14,493	$	1,575,435



	December 31, 2017
	Commercial Real Estate		Consumer Real Estate		Construction and Land Development		Commercial and Industrial		Consumer and Other		Total
Performing loans	$	624,638	$	284,585	$	129,742	$	237,016	$	11,842	$	1,287,823
Impaired loans	447		1,422		547		213		12		2,641
	625,085		286,007		130,289		237,229		11,854		1,290,464
PCI loans	17,903		7,450		5,120		858		1,463		32,794
Total loans	$	642,988	$	293,457	$	135,409	$	238,087	$	13,317	$	1,323,258

The following tables show the allowance for loan losses allocation by loan classification for impaired, PCI, and performing loans as of June 30, 2018 and December 31, 2017 (in thousands):



	June 30, 2018
	Commercial Real Estate		Consumer Real Estate		Construction and Land Development		Commercial and Industrial		Consumer and Other		Total
Performing loans	$	3,116	$	1,491	$	744	$	1,145	$	224	$	6,720
PCI loans	19		—		—		—		—		19
Impaired loans	—		37		—		222		76		335
Total	$	3,135	$	1,528	$	744	$	1,367	$	300	$	7,074



	December 31, 2017
	Commercial Real Estate		Consumer Real Estate		Construction and Land Development		Commercial and Industrial		Consumer and Other		Total
Performing loans	$	2,444	$	1,340	$	521	$	890	$	204	$	5,399
PCI loans	16		—		—		—		—		16
Impaired loans	5		256		—		172		12		445
Total	$	2,465	$	1,596	$	521	$	1,062	$	216	$	5,860

Note 5. Loans and Allowance for Loan Losses, Continued

Credit Risk Management (continued):

The following tables detail the changes in the allowance for loan losses for the six month period ending June 30, 2018 and year ending December 31, 2017, by loan classification (in thousands):



	June 30, 2018
	Commercial Real Estate			Consumer Real Estate			Construction and Land Development		Commercial and Industrial			Consumer and Other			Total
Beginning balance	$	2,465		$	1,596		$	521	$	1,062		$	216		$	5,860
Loans charged off	(38		)	(25		)	—		(78		)	(101		)	(242		)
Recoveries of loans charged off	—			50			5		56			40			151
Provision (reallocation) charged to expense	708			(93		)	218		327			145			1,305
Ending balance	$	3,135		$	1,528		$	744	$	1,367		$	300		$	7,074



	December 31, 2017
	Commercial Real Estate		Consumer Real Estate			Construction and Land Development			Commercial and Industrial			Consumer and Other			Total
Beginning balance	$	2,369	$	1,382		$	717		$	520		$	117		$	5,105
Loans charged off	—		(111		)	—			(24		)	(141		)	(276		)
Recoveries of charge-offs	8		99			13			67			61			248
Provision (reallocation) charged to expense	88		226			(209		)	499			179			783
Ending balance	$	2,465	$	1,596		$	521		$	1,062		$	216		$	5,860

A description of the general characteristics of the risk grades used by the Company is as follows:

Pass: Loans in this risk category involve borrowers of acceptable-to-strong credit quality and risk who have the apparent ability to satisfy their loan obligations. Loans in this risk grade would possess sufficient mitigating factors, such as adequate collateral or strong guarantors possessing the capacity to repay the debt if required, for any weakness that may exist.

Special Mention: Loans in this risk grade are the equivalent of the regulatory definition of "Other Assets Especially Mentioned" classification. Loans in this category possess some credit deficiency or potential weakness, which requires a high level of management attention. Potential weaknesses include declining trends in operating earnings and cash flows and /or reliance on the secondary source of repayment. If left uncorrected, these potential weaknesses may result in noticeable deterioration of the repayment prospects for the asset or in the Company's credit position.

Substandard: Loans in this risk grade are inadequately protected by the borrower's current financial condition and payment capability or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the orderly repayment of debt. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected.

Doubtful: Loans in this risk grade have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or orderly repayment in full, on the basis of current existing facts, conditions and values, highly questionable and improbable. Possibility of loss is extremely high, but because of certain important and reasonably specific factors that may work to the advantage and strengthening of the exposure, its classification as an estimated loss is deferred until its more exact status may be determined.

Note 5. Loans and Allowance for Loan Losses, Continued

Credit Risk Management (continued):

Uncollectible: Loans in this risk grade are considered to be non-collectible and of such little value that their continuance as bankable assets is not warranted. This does not mean the loan has absolutely no recovery value, but rather it is neither practical nor desirable to defer writing off the loan, even though partial recovery may be obtained in the future. Charge-offs against the allowance for loan losses are taken in the period in which the loan becomes uncollectible. Consequently, the Company typically does not maintain a recorded investment in loans within this category.

The following tables outline the amount of each loan classification and the amount categorized into each risk rating as of June 30, 2018 and December 31, 2017 (in thousands):



	June 30, 2018
Non PCI Loans	Commercial Real Estate		Consumer Real Estate		Construction and Land Development		Commercial and Industrial		Consumer and Other		Total
Pass	$	724,763	$	343,407	$	172,972	$	277,384	$	13,184	$	1,531,710
Watch	1,604		3,168		62		1,035		123		5,992
Special mention	—		949		160		35		363		1,507
Substandard	1,023		1,365		547		483		111		3,529
Doubtful	—		—		—		13		26		39
Total	$	727,390	$	348,889	$	173,741	$	278,950	$	13,807	$	1,542,777



PCI Loans
Pass	$	14,494	$	4,558	$	3,973	$	210	$	565	$	23,800
Watch	1,513		898		653		2		18		3,084
Special mention	1,393		575		716		153		17		2,854
Substandard	1,074		956		348		456		86		2,920
Doubtful	—		—		—		—		—		—
Total	$	18,474	$	6,987	$	5,690	$	821	$	686	$	32,658
Total loans	$	745,864	$	355,876	$	179,431	$	279,771	$	14,493	$	1,575,435

Note 5. Loans and Allowance for Loan Losses, Continued

Credit Risk Management (continued):



	December 31, 2017
Non PCI Loans	Commercial Real Estate		Consumer Real Estate		Construction and Land Development		Commercial and Industrial		Consumer and Other		Total
Pass	$	616,028	$	279,464	$	129,359	$	233,942	$	11,624	$	1,270,417
Watch	7,673		2,543		383		3,007		62		13,668
Special mention	1,006		2,627		—		64		155		3,852
Substandard	378		1,159		547		157		—		2,241
Doubtful	—		214		—		59		13		286
Total	$	625,085	$	286,007	$	130,289	$	237,229	$	11,854	$	1,290,464



PCI Loans
Pass	$	14,386	$	4,151	$	4,134	$	68	$	819	$	23,558
Watch	261		1,345		649		120		262		2,637
Special mention	—		456		—		58		24		538
Substandard	3,084		1,192		337		588		107		5,308
Doubtful	172		306		—		24		251		753
Total	$	17,903	$	7,450	$	5,120	$	858	$	1,463	$	32,794
Total loans	$	642,988	$	293,457	$	135,409	$	238,087	$	13,317	$	1,323,258

Past Due Loans:

A loan is considered past due if any required principal and interest payments have not been received as of the date such payments were required to be made under the terms of the loan agreement. Generally, management places a loan on nonaccrual when there is a clear indicator that the borrower’s cash flow may not be sufficient to meet payments as they become due, which is generally when a loan is 90 days past due.

The following tables present the aging of the recorded investment in loans as of June 30, 2018 and December 31, 2017 (in thousands):



	June 30, 2018
	30-89 Days Past Due and Accruing		Past Due 90 Days or More and Accruing		Nonaccrual		Total Past Due and NonAccrual		PCI Loans		Current Loans		Total Loans
Commercial real estate	$	2,628	$	82	$	6	$	2,716	$	18,474	$	724,674	$	745,864
Consumer real estate	701		76		463		1,240		6,987		347,649		355,876
Construction and land development	403		338		547		1,288		5,690		172,453		179,431
Commercial and industrial	647		113		430		1,190		821		277,760		279,771
Consumer and other	189		58		92		339		686		13,468		14,493
Total	$	4,568	$	667	$	1,538	$	6,773	$	32,658	$	1,536,004	$	1,575,435

Note 5. Loans and Allowance for Loan Losses, Continued

Past Due Loans (continued):



	December 31, 2017
	30-89 Days Past Due and Accruing		Past Due 90 Days or More and Accruing		Nonaccrual		Total Past Due and NonAccrual		PCI Loans		Current Loans		Total Loans
Commercial real estate	$	517	$	728	$	128	$	1,373	$	17,903	$	623,712	$	642,988
Consumer real estate	963		33		991		1,987		7,450		284,020		293,457
Construction and land development	65		326		547		938		5,120		129,351		135,409
Commercial and industrial	286		131		85		502		858		236,727		238,087
Consumer and other	165		291		13		469		1,463		11,385		13,317
Total	$	1,996	$	1,509	$	1,764	$	5,269	$	32,794	$	1,285,195	$	1,323,258

Impaired Loans:

The following is an analysis of the impaired loan portfolio, excluding PCI loans, detailing the related allowance recorded as of June 30, 2018 and December 31, 2017 (in thousands):



							For the six months ended
	At June 30, 2018						June 30, 2018
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
Impaired loans without a valuation allowance:
Commercial real estate	$	1,034	$	1,043	$	—	$	670	$	15
Consumer real estate	793		823		—		699		12
Construction and land development	547		547		—		547		—
Commercial and industrial	81		83		—		58		3
Consumer and other	16		16		—		5		—
	2,471		2,512		—		1,979		30
Impaired loans with a valuation allowance:
Commercial real estate	—		—		—		8		—
Consumer real estate	203		216		37		642		11
Construction and land development	—		—		—		—		—
Commercial and industrial	438		440		222		257		5
Consumer and other	93		95		76		72		2
	734		751		335		979		18
PCI loans:
Commercial real estate	27		127		19		5		3
Total impaired loans	$	3,232	$	3,390	$	354	$	2,963	$	51

Note 5. Loans and Allowance for Loan Losses, Continued

Impaired Loans (continued):



							For the year ended
	At December 31, 2017						December 31, 2017
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
Impaired loans without a valuation allowance:
Commercial real estate	$	424	$	454	$	—	$	204	$	44
Consumer real estate	415		420		—		401		16
Construction and land development	547		547		—		628		—
Commercial and industrial	41		41		—		44		3
Consumer and other	—		—		—		—		—
	1,427		1,462		—		1,277		63
Impaired loans with a valuation allowance:
Commercial real estate	23		23		5		5		1
Consumer real estate	1,007		1,033		256		601		38
Construction and land development	—		—		—		—		—
Commercial and industrial	172		172		172		117		10
Consumer and other	12		13		12		2		1
	1,214		1,241		445		725		50
PCI loans:
Commercial real estate	16		123		16		3		16
Total impaired loans	$	2,657	$	2,826	$	461	$	2,005	$	129

Troubled Debt Restructurings:

At June 30, 2018 and December 31, 2017, impaired loans included loans that were classified as Troubled Debt Restructurings ("TDRs"). The restructuring of a loan is considered a TDR if both (i) the borrower is experiencing financial difficulties and (ii) the creditor has granted a concession.

In assessing whether or not a borrower is experiencing financial difficulties, the Company considers information currently available regarding the financial condition of the borrower. This information includes, but is not limited to, whether (i) the debtor is currently in payment default on any of its debt; (ii) a payment default is probable in the foreseeable future without the modification; (iii) the debtor has declared or is in the process of declaring bankruptcy; and (iv) the debtor's projected cash flow is sufficient to satisfy contractual payments due under the original terms of the loan without a modification.

The Company considers all aspects of the modification to loan terms to determine whether or not a concession has been granted to the borrower. Key factors considered by the Company include the debtor's ability to access funds at a market rate for debt with similar risk characteristics, the significance of the modification relative to unpaid principal balance or collateral value of the debt, and the significance of a delay in the timing of payments relative to the original contractual terms of the loan.

Note 5. Loans and Allowance for Loan Losses, Continued

Troubled Debt Restructurings (continued):

The most common concessions granted by the Company generally include one or more modifications to the terms of the debt, such as (i) a reduction in the interest rate for the remaining life of the debt; (ii) an extension of the maturity date at an interest rate lower than the current market rate for new debt with similar risk; (iii) a temporary period of interest-only payments; and (iv) a reduction in the contractual payment amount for either a short period or remaining term of the loan. As of June 30, 2018 and December 31, 2017, management had approximately, $660 thousand and $41 thousand, respectively, in loans that met the criteria for restructured, none of which were on nonaccrual. A loan is placed back on accrual status when both principal and interest are current and it is probable that management will be able to collect all amounts due (both principal and interest) according to the terms of the loan agreement.

There was one commercial real estate loan for approximately $622 thousand modified as troubled debt restructurings during the six month period ended June 30, 2018. There were no loans that were modified as troubled debt restructurings during the twelve month period ended December 31, 2017. There were no loans that were modified as troubled debt restructurings during the past three months and for which there was a subsequent payment default.

Foreclosure Proceedings and Balances:

As of June 30, 2018 the Company had $1.14 million in residential real estate included in foreclosed assets and there were no consumer mortgage loans collateralized by residential real estate property that were in the process of foreclosure.

Purchased Credit Impaired Loans:

The Company has acquired loans which there was, at acquisition, evidence of deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected. The carrying amount of those loans as of is as follows (in thousands):



	June 30, 2018			December 31, 2017
Commercial real estate	$	25,700		$	23,366
Consumer real estate	9,620			10,764
Construction and land development	6,793			6,285
Commercial and industrial	2,973			1,452
Consumer and other	1,014			1,710
Total loans	46,100			43,577
Less remaining purchase discount	(13,442		)	(10,783		)
Total loans, net of purchase discount	32,658			32,794
Less: Allowance for loan losses	(19		)	(16		)
Carrying amount, net of allowance	$	32,639		$	32,778

Activity related to the accretable yield on loans acquired with deteriorated credit quality is as follows for the three and six months period ended June 30, 2018 and 2017 (in thousands):



	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Accretable yield, beginning of period	$	7,780		$	8,482		$	9,287		$	8,950
Additions	1,292			—			1,292			—
Accretion income	(1,928		)	(973		)	(3,029		)	(1,670		)
Reclassification to accretable	120			366			382			610
Other changes, net	(58		)	600			(726		)	585
Accretable yield	$	7,206		$	8,475		$	7,206		$	8,475

Note 5. Loans and Allowance for Loan Losses, Continued

Purchased Credit Impaired Loans (continued):

Purchased credit impaired loans acquired from Southern Community Bank during the three and six months period ended June 30, 2018 for which it was probable at acquisition that all contractually required payments would not be collected are as follows (in thousands):



	Three and Six Months Ended June 30,
	2018
Contractual principal and interest at acquisition	$	15,133
Nonaccretable difference	5,302
Expected cash flows at acquisition	9,831
Accretable yield	1,292
Fair value of purchased credit impaired loans	$	8,539

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Commitments and Contingent Liabilities

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingent Liabilities

Off Balance Sheet Arrangements:

In the normal course of business, the Bank has entered into off-balance sheet financial instruments which include commitments to extend credit (i.e., including unfunded lines of credit) and standby letters of credit. Commitments to extend credit are usually the result of lines of credit granted to existing borrowers under agreements that the total outstanding indebtedness will not exceed a specific amount during the term of the indebtedness. Typical borrowers are commercial concerns that use lines of credit to supplement their treasury management functions; thus their total outstanding indebtedness may fluctuate during any time period based on the seasonality of their business and the resultant timing of their cash flows. Other typical lines of credit are related to home equity loans granted to consumers. Commitments to extend credit generally have fixed expiration dates or other termination clauses and may require payment of a fee.

Standby letters of credit are generally issued on behalf of an applicant (our client) to a specifically named beneficiary and are the result of a particular business arrangement that exists between the applicant and the beneficiary. Standby letters of credit have fixed expiration dates and are usually for terms of two years or less unless terminated beforehand due to criteria specified in the standby letter of credit. A typical arrangement involves the applicant routinely being indebted to the beneficiary for such items as inventory purchases, insurance, utilities, lease guarantees or other third party commercial transactions. The standby letter of credit would permit the beneficiary to obtain payment from the Bank under certain prescribed circumstances. Subsequently, the Bank would seek reimbursement from the applicant pursuant to the terms of the standby letter of credit.

The Bank follows the same credit policies and underwriting practices when making these commitments as it does for on-balance sheet instruments. Each client’s creditworthiness is evaluated on a case-by-case basis, and the amount of collateral obtained, if any, is based on management’s credit evaluation of the customer. Collateral held varies but may include cash, real estate and improvements, marketable securities, accounts receivable, inventory, equipment and personal property.

The contractual amounts of these commitments are not reflected in the consolidated financial statements and would only be reflected if drawn upon. Since many of the commitments are expected to expire without being drawn upon, the contractual amounts do not necessarily represent future cash requirements. However, should the commitments be drawn upon and should customers default on their resulting obligation to the Bank the maximum exposure to credit loss, without consideration of collateral, is represented by the contractual amount of those instruments.

A summary of the Bank’s total contractual amount for all off-balance sheet commitments at June 30, 2018 is as follows:



Commitments to extend credit	$	299.6	million
Standby letters of credit	$	3.7	million

Various legal claims also arise from time to time in the normal course of business. In the opinion of management, the resolution of claims outstanding at June 30, 2018 will not have a material effect on the Company's consolidated financial statements.

Fair Value Disclosures

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Disclosures

Determination of Fair Value:

The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. In accordance with the “Fair Value Measurements and Disclosures” ASC Topic 820, the fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is best determined based upon quoted market prices. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument.

ASC Topic 820 provides a consistent definition of fair value, which focuses on exit price in an orderly transaction between market participants at the measurement date under current market conditions. If there has been a significant decrease in the volume and level of activity for the asset or liability, a change in valuation technique or the use of multiple valuation techniques may be appropriate. In such instances, determining the price at which willing market participants would transact at the measurement date under current market conditions depends on the facts and circumstances and requires the use of significant judgment. The fair value is a reasonable point within the range that is most representative of fair value under current market conditions.

Fair Value Hierarchy:

In accordance with this guidance, the Company groups its financial assets and financial liabilities generally measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value.

Level 1 - Valuation is based on quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 1 assets and liabilities generally include debt and equity securities that are traded in an active exchange market. Valuations are obtained from readily available pricing sources for market transactions involving identical assets or liabilities.

Level 2 - Valuation is based on inputs other than quoted prices included within Level I that are observable for the asset or liability, either directly or indirectly. The valuation may be based on quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability.

Level 3 - Valuation is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which determination of fair value requires significant management judgment or estimation.

A financial instrument's categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement.

The following methods and assumptions were used by the Company in estimating fair value disclosures for financial instruments:

Cash and Cash Equivalents: For cash and due from banks, interest-bearing deposits, and federal funds sold, the carrying amount is a reasonable estimate of fair value based on the short-term nature of the assets and are considered Level 1 inputs.

Securities Available-for-Sale: Where quoted prices are available in an active market, management classifies the securities within Level 1 of the valuation hierarchy. If quoted market prices are not available, management estimates fair values using pricing models that use observable inputs or quoted prices at securities with similar characteristics. Examples of such instruments, which would generally be classified within Level 2 of the valuation hierarchy, including GSE obligations, corporate bonds, and other securities. Mortgage-backed securities are included in Level 2 if observable inputs are available. In certain cases where there is limited activity or less transparency around inputs to the valuation, management classifies those securities in Level 3.

Restricted Investments: It is not practicable to determine the fair value of restricted investments due the restrictions placed on its transferability.

Note 7. Fair Value Disclosures, Continued

Fair Value Hierarchy (continued):

Loans: With the adoption of ASU 2016-01 on January 1, 2018, we refined our methodology to estimate the fair value of our loan portfolio to use the exit price notion as required by the ASU. The guidance was applied on a prospective approach resulting in prior-periods no longer being comparable. See “Note 1 – Presentation of Financial Information” for further information. For variable-rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying values. Fair value for fixed rate loans are estimated using discounted cash flow analyses, using market interest rates for comparable loans. Fair values for nonperforming loans are estimated using discounted cash flow analyses or underlying collateral values, where applicable. These methods are considered Level 3 inputs.

Deposits: The fair values disclosed for demand deposits (for example, interest and noninterest checking, savings, and certain types of money market accounts) are, by definition, equal to the amount payable on demand at the reporting date (that is, their carrying amounts) and are considered Level 2 inputs. Fair values for fixed-rate time deposits are estimated using a discounted cash flow calculation that applies market interest rates on comparable instruments to a schedule of aggregated expected monthly maturities on time deposits, and are considered Level 2 inputs.

Securities Sold Under Agreement to Repurchase: The carrying value of these liabilities approximates their fair value, and are considered Level 1 inputs.

Federal Home Loan Bank ("FHLB") Advances and Other Borrowings: The fair value of the FHLB fixed rate borrowings are estimated using discounted cash flows, based on the current incremental borrowing rates for similar types of borrowing arrangements, and are considered Level 2 inputs. The carrying value of FHLB floating rate borrowings and floating rate other borrowings approximates their fair value and are considered Level 1 inputs.

Commitments to Extend Credit and Standby Letters of Credit: Because commitments to extend credit and standby letters of credit are made using variable rates and have short maturities, the carrying value and the fair value are immaterial for disclosure.

Measurements of Fair Value:

Assets and liabilities recorded at fair value on a recurring basis are as follows (in thousands):



	Balance as of June 30, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
Debt securities available-for-sale:
U.S. Government-sponsored enterprises (GSEs)	$	28,128	$	—	$	28,128	$	—
Mortgage-backed securities	111,954		—		111,954		—
Other debt securities	911		—		911		—
Municipal securities	15,584		—		15,584		—
Total securities available-for-sale	$	156,577	$	—	$	156,577	$	—



	Balance as of December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
Debt securities available-for-sale:
U.S. Government-sponsored enterprises (GSEs)	$	25,776	$	—	$	25,776	$	—
Mortgage-backed securities	116,215		—		116,215		—
Other debt securities	950		—		950		—
Municipal securities	9,003		—		9,003		—
Total securities available-for-sale	$	151,944	$	—	$	151,944	$	—

Note 7. Fair Value Disclosures, Continued

Measurements of Fair Value (continued):

The Company has no assets or liabilities whose fair values are measured on a recurring basis using Level 3 inputs. Additionally, there were no transfers between Level 1 and Level 2 in the fair value hierarchy.

Assets Measured at Fair Value on a Nonrecurring Basis:

Under certain circumstances management makes adjustments to fair value for assets and liabilities although they are not measured at fair value on an ongoing basis. The following tables present the financial instruments carried on the consolidated balance sheets by caption and by level in the fair value hierarchy, for which a nonrecurring change in fair value has been recorded (in thousands):



	Balance as of June 30, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
Impaired loans	$	407	$	—	$	—	$	407
Foreclosed assets	3,524		—		—		3,524



	Balance as of December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
Impaired loans	$	769	$	—	$	—	$	769
Foreclosed assets	3,254		—		—		3,254

For Level 3 assets measured at fair value on a non-recurring basis as of March 31, 2018 and December 31, 2017, , the significant unobservable inputs used in the fair value measurements are presented below (in thousands).



	Balance as of June 30, 2018		Valuation Technique	Significant Other Unobservable Input	Weighted Average of Input
Impaired loans	$	407	Appraisal and Cashflow	Appraisal and Cashflow Discounts	47	%
Foreclosed assets	3,524		Appraisal	Appraisal Discounts	19	%



	Balance as of December 31, 2017		Valuation Technique	Significant Other Unobservable Input	Weighted Average of Input
Impaired loans	$	769	Appraisal	Appraisal Discounts	36	%
Foreclosed assets	3,254		Appraisal	Appraisal Discounts	18	%

Impaired Loans: Loans considered impaired under ASC 310-10-35, Receivables, are loans for which, based on current information and events, it is probable that the Company will be unable to collect all principal and interest payments due in accordance with the contractual terms of the loan agreement. Impaired loans can be measured based on the present value of expected payments using the loan’s original effective rate as the discount rate, the loan’s observable market price, or the fair value of the collateral less selling costs if the loan is collateral dependent. The fair value of impaired loans were measured based on the value of the collateral securing these loans or the discounted cash flows of the loans, as applicable. Impaired loans are classified within Level 3 of the fair value hierarchy. Collateral may be real estate and/or business assets including equipment, inventory, and/or accounts receivable. The Company determines the value of the collateral based on independent appraisals performed by qualified licensed appraisers. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Appraised values are discounted for costs to sell and may be discounted further based on management’s historical knowledge, changes in market conditions from the date of the most recent appraisal, and/or management’s expertise and knowledge of the customer and the customer’s business. Such discounts by management are subjective and are typically significant

Note 7. Fair Value Disclosures, Continued

Assets Measured at Fair Value on a Nonrecurring Basis (consintued):

unobservable inputs for determining fair value. Impaired loans are reviewed and evaluated on at least a quarterly basis for additional impairment and adjusted accordingly, based on the same factors discussed above.

Foreclosed assets: Foreclosed assets, consisting of properties obtained through foreclosure or in satisfaction of loans, are initially recorded at fair value less estimated costs to sell upon transfer of the loans to other real estate. Subsequently, other real estate is carried at the lower of carrying value or fair value less costs to sell. Fair values are generally based on third party appraisals of the property and are classified within Level 3 of the fair value hierarchy. The appraisals are sometimes further discounted based on management’s historical knowledge, and/or changes in market conditions from the date of the most recent appraisal, and/or management’s expertise and knowledge of the customer and the customer’s business. Such discounts are typically significant unobservable inputs for determining fair value. In cases where the carrying amount exceeds the fair value, less estimated costs to sell, a loss is recognized in noninterest expense.

Carrying value and estimated fair value:

The carrying amount and estimated fair value of the Company’s financial instruments at June 30, 2018 and December 31, 2017 are as follows (in thousands):



	June 30, 2018
			Fair Value Measurements Using
	Carrying Amount		Level 1	Level 2	Level 3	Estimated Fair Value
Assets:
Cash and cash equivalents	$	170,235	170,235	—	—	$	170,235
Securities available-for-sale	156,577		—	156,577	—	156,577
Restricted investments	8,273		N/A	N/A	N/A	N/A
Loans, net	1,568,361		—	—	1,569,916	1,569,916

Liabilities:
Noninterest-bearing demand deposits	301,318		—	301,318	—	301,318
Interest-bearing demand deposits	246,942		—	246,942	—	246,942
Money Market and Savings deposits	632,518		—	632,518	—	632,518
Time deposits	535,879		—	537,006	—	537,006
Securities sold under agreements to repurchase	18,635		—	18,635	—	18,635
Federal Home Loan Bank advances and other borrowings	72,040		—	72,040	—	72,040

Note 7. Fair Value Disclosures, Continued

Carrying value and estimated fair value (continued):



	December 31, 2017
			Fair Value Measurements Using
	Carrying Amount		Level 1	Level 2	Level 3	Estimated Fair Value
Assets:
Cash and cash equivalents	$	113,027	113,027	—	—	$	113,027
Securities available-for-sale	151,944		—	151,944	—	151,944
Restricted investments	6,431		N/A	N/A	N/A	N/A
Loans, net	1,317,398		—	—	1,292,303	1,292,303

Liabilities:
Noninterest-bearing demand deposits	220,520		—	220,520	—	250,520
Interest-bearing demand deposits	231,644		—	231,644	—	231,644
Money Market and Savings deposits	543,645		—	543,645	—	543,645
Time deposits	442,774		—	443,547	—	443,547
Securities sold under agreements to repurchase	24,055		—	24,055	—	24,055
Federal Home Loan Bank advances and other borrowings	43,600		—	43,600	—	43,600

Limitations

Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on many judgments. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

Fair value estimates are based on existing on and off-balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Significant assets and liabilities that are not considered financial instruments include deferred income taxes and premises and equipment. In addition,

the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimates.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Small Business Lending Fund	6 Months Ended
Small Business Lending Fund	Jun. 30, 2018
Small Business Lending Fund [Abstract]
Small Business Lending Fund	Small Business Lending Fund In connection with the Company's merger with Legacy SmartFinancial, Inc. in 2015, the company assumed Legacy SmartFinancial's obligations under that certain stock purchase agreement with the U.S. Department of the Treasury and issued 12,000 shares of preferred stock at $1,000 per share under the Small Business Lending Fund Program (the "SBLF Program").The Company paid cash dividends at a one percent rate or $120,000 for the year ended December 31, 2015 on the preferred shares. On February 4, 2016 the dividend rate for the preferred shares increased to nine percent and as a result the company incurred preferred stock dividends of $1,022,000 for the year ended December 31, 2016 . On January 30, 2017, the Company completed a public offering of 2,010,084 shares of its common stock with the net proceeds to the Company of approximately $33.2 million. On March 6, 2017 the Company used proceeds from the offering to redeem the $12 million of preferred stock and pay the $195 thousand accrued dividend.

Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions On March 1, 2018, two directors agreed to purchase from the Bank 21,250 shares of the Company's stock for the closing market price of $21.70 per share. The shares were held by the Bank as collateral on a past due loan with an unrelated borrower.. Steven B. Tucker purchased 6,250 shares and W. Miller Welborn purchased 15,000 shares for the benefit of a trust.

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On June 27, 2018, the Company entered into an agreement and plan of merger with Foothills Bancorp, Inc. ("Foothills Bancorp"), a Tennessee corporation and Foothills Bank and Trust, a Tennessee-chartered commercial bank and wholly owned subsidiary of Foothills Bancorp . Under the terms of the merger agreement, at the effective time of the merger, each outstanding share of Foothills Bancorp common stock will be converted into the right to receive $1.75 in cash and 0.666 shares of SmartFinancial common stock, (the "Stock Consideration"). As of June 26, 2018, Foothills Bancorp had 1,776,925 shares of common stock outstanding. The merger agreement contains customary representations, warranties, and covenants by all parties. Conditions to each party's obligation to consummate the Merger include the following, as well as other customary conditions: (1) approval of the merger Agreement by the holders of Foothills Bancorp common stock, (2) approval of the merger by regulatory authorities, (3) effectiveness of a registration statement for the shares issued as Stock Consideration, and (4) authorization to list the shares to be issued as Stock Consideration on the Nasdaq Capital Market. Conditions to SmartFinancial's obligation to consummate the merger include holders of not more than 10% of the outstanding shares of Foothills Bancorp common stock having perfected and not withdrawn or lost their rights to dissent from the Merger. The merger agreement provides certain termination rights for both SmartFinancial and Foothills Bancorp and further provides that, upon termination of the merger agreement under certain circumstances, Foothills Bancorp will be obligated to pay SmartFinancial a termination fee of $1,450,000.

Presentation of Financial Information (Policies)	6 Months Ended
Presentation of Financial Information (Policies)	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	Nature of Business: SmartFinancial, Inc. (the “Company”) is a bank holding company whose principal activity is the ownership and management of its wholly-owned subsidiary, SmartBank (the “Bank”). The Company provides a variety of financial services to individuals and corporate customers through its offices in eastern Tennessee, Alabama, Florida, and Georgia. The Company’s primary deposit products are interest-bearing demand deposits and time deposits. Its primary lending products are commercial, residential, and consumer loans.
Interim Financial Information (Unaudited)	Interim Financial Information (Unaudited): The financial information in this report for June 30, 2018 and June 30, 2017 has not been audited. The information included herein should be read in conjunction with the Company’s annual consolidated financial statements and footnotes included in the Company's most recent Annual Report on Form 10-K. The consolidated financial statements presented herein conform to U.S. generally accepted accounting principles and to general industry practices. In the opinion of SmartFinancial’s management, the accompanying interim financial statements contain all material adjustments necessary to present fairly the financial condition, the results of operations, and cash flows for the interim period. Results for interim periods are not necessarily indicative of the results to be expected for a full year.
Basis of Presentation and Accounting Estimates	Basis of Presentation and Accounting Estimates: All adjustments consisting of normal recurring accruals, that in the opinion of management, are necessary for a fair presentation of the financial position and the results of operations for the periods covered by the report have been included. The accompanying unaudited consolidated financial statements and related notes should be read in conjunction with those appearing in the most recent Annual Report previously filed on Form 10-K. The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary. All significant intercompany balances and transactions have been eliminated in consolidation. In preparing the consolidated financial statements in conformity with accounting principles generally accepted in the U.S, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet, and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses, the valuation of foreclosed assets and deferred taxes, other-than-temporary impairments of securities, and the fair value of financial instruments. The determination of the adequacy of the allowance for loan losses is based on estimates that are particularly susceptible to significant changes in the economic environment and market conditions. In connection with the determination of the estimated losses on loans, management obtains independent appraisals for significant collateral. The Company’s loans are generally secured by specific items of collateral including real property, consumer assets, and business assets. Although the Company has a diversified loan portfolio, a substantial portion of its debtors’ ability to honor their contracts is dependent on local economic conditions. While management uses available information to recognize losses on loans, further reductions in the carrying amounts of loans may be necessary based on changes in local economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review the estimated losses on loans. Such agencies may require the Company to recognize additional losses based on their judgments about information available to them at the time of their examination. Because of these factors, it is reasonably possible that the estimated losses on loans may change materially in the near term. However, the amount of the change that is reasonably possible cannot be estimated.
Accounting Changes and Recently Issued Accounting Pronouncements	Accounting Changes: We adopted ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)” and its related amendments as of January 1, 2018 utilizing the modified retrospective approach. The implementation of the new standard did not have a material impact on the measurement or recognition of revenue; as such, a cumulative effect adjustment to opening retained earnings was not deemed necessary. Since the guidance does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other GAAP, the new guidance did not have a material impact on revenue most closely associated with financial instruments, including interest income and expense. The Company completed its overall assessment of revenue streams and review of related contracts potentially affected by the ASU, including, deposit related fees, interchange fees, merchant income, and insurance and brokerage commissions. Based on this assessment, the Company concluded that ASU 2014-09 did not materially change the method in which the Company currently recognizes revenue for these revenue streams. Under ASU 2014-09, we adopted new policies related to revenue recognition. In general, for revenue not associated with financial instruments, guarantees and lease contracts, we apply the following steps when recognizing revenue from contracts with customers: (i) identify the contract, (ii) identify the performance obligations, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations and (v) recognize revenue when performance obligation is satisfied. Our contracts with customers are generally short term in nature, typically due within one year or less or cancellable by us or our customer upon a short notice period. Performance obligations for our customer contracts are generally satisfied at a single point in time, typically when the transaction is complete, or over time. For performance obligations satisfied over time, we primarily use the output method, directly measuring the value of the products/services transferred to the customer, to determine when performance obligations have been satisfied. We typically receive payment from customers and recognize revenue concurrent with the satisfaction of our performance obligations. In most cases, this occurs within a single financial reporting period. For payments received in advance of the satisfaction of performance obligations, revenue recognition is deferred until such time the performance obligations have been satisfied. In cases where we have not received payment despite satisfaction of our performance obligations, we accrue an estimate of the amount due in the period our performance obligations have been satisfied. For contracts with variable components, only amounts for which collection is probable are accrued. We generally act in a principal capacity, on our own behalf, in most of our contracts with customers. In such transactions, we recognize revenue and the related costs to provide our services on a gross basis in our financial statements. In some cases, we act in an agent capacity, deriving revenue through assisting other entities in transactions with our customers. In such transactions, we recognized revenue and the related costs to provide our services on a net basis in our financial statements. These transactions relate to our customers' use of various interchange and ATM/debit card networks. Based on our underlying contracts, ASU 2014-09 requires us to report network costs associated with debit card and ATM transactions netted against the related fees from such transactions. Previously, such network costs were reported as a component of other noninterest expense. For the three and six months periods ended June 30, 2018, gross interchange and debit card transaction fees totaled $401 thousand and $733 thousand, respectively while related network costs totaled $280 thousand and $467 thousand, respectively. On a net basis, we reported $121 thousand and $267 thousand as interchange and debit card transaction fees in the accompanying Consolidated Statement of Income for the three and six months periods ended June 30, 2018. For the three and six months periods ended June 30, 2017, we reported interchange and debit card transaction fees totaling $223 thousand and $416 thousand, respectively on a gross basis in the accompanying Consolidated Statement of Income while related network costs totaling $140 thousand and $227 thousand, respectively were reported in other operating expenses included as a component of other noninterest expense. ASU 2016-01 "Financial Instruments - Overall (Subtopic 825-10): Recognition of Financial Assets and Financial Liabilities, ("ASU 2016-01") makes targeted amendments to the guidance for recognition, measurement, presentation and disclosure of financial instruments. ASU 2016-01 requires equity investments, other than equity method investments, to be measured at fair value with changes in fair value recognized in net income. The ASU requires a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption to reclassify the cumulative change in fair value of equity securities previously recognized in Accumulated Other Comprehensive Income. ASU 2016-01 became effective for the Company on January 1, 2018 and there was no adjustment to retained earnings. ASU 2016-01 also emphasizes the existing requirement to use exit prices to measure fair value for disclosure purposes and clarifies that entities should not make use of a practicability exception in determining the fair value of loans. Accordingly, we refined the calculation used to determine the disclosed fair value of our loans held for investment portfolio as part of adopting this standard. The refined calculation is disclosed Note 6 - Fair Value Disclosures. Note 1. Presentation of Financial Information, Continued Accounting Changes (continued): In February 2018, the FASB issued ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income; (“ASU 2018-02”). ASU 2018-02 amends ASC Topic 220 and allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (“Tax Reform Act”). Consequently, this amendment eliminates the stranded tax effects resulting from the Tax Reform Act and will improve the usefulness of information reported to financial statement users. However, because the amendments only related to the reclassification of the income tax effects of the Tax Reform Act, the underlying guidance that requires that the effects of the change in tax laws or rates be included in income from continuing operations is not affected. The guidance is effective for public companies for annual periods beginning on or after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period, (1) for public business entities for reporting periods for which financial statements have not yet been issued and (2) for all other entities for reporting periods for which financial statements have not yet been made available for issuance. This amendment should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in U.S. federal corporate income tax rate in the Tax Reform Act is recognized. The Company early adopted this amendment in the fourth quarter of 2017 and reclassified $197 thousand from accumulated other comprehensive income to retained earnings for the stranded tax effects resulting from the Tax Reform Act. Recently Issued Accounting Pronouncements: During interim periods, the Company follows the accounting policies set forth in its annual audited financial statements for the year ended December 31, 2017 as filed with the Securities and Exchange Commission. The following is a summary of recent authoritative pronouncements not yet effective that could impact the accounting, reporting, and/or disclosure of financial information by the Company issued since December 31, 2017. In February 2016, the FASB issued guidance that requires lessees to recognize almost all leases on their balance sheet as a right-of-use asset and a lease liability in ASU 2016-2: Leases (Topic 842). For income statement purposes, the FASB retained a dual model, requiring leases to be classified as either operating or finance. Classification will be based on criteria that are largely similar to those applied in current lease accounting, but without explicit bright lines. Lessor accounting is similar to the current model, but updated to align with certain changes to the lessee model and the new revenue recognition standard. Existing sale-leaseback guidance, including guidance for real estate, is replaced with a new model applicable to both lessees and lessors. The new guidance will be effective for public business entities for annual periods beginning after December 15, 2018 including interim periods within those fiscal years. The Company has several lease agreements, such as branch locations, which are currently considered operating leases, and therefore, not recognized on the Company’s consolidated statements of condition. The Company expects the new guidance will require these lease agreements to be recognized on the consolidated statements of condition as a right-of-use asset and a corresponding lease liability. Therefore, the Company’s preliminary evaluation indicates the provisions of ASU No. 2016-02 are expected to impact the Company’s consolidated statements of condition, along with our regulatory capital ratios. However, the Company continues to evaluate the extent of potential impact the new guidance will have on the Company’s consolidated financial statements. The Company is in the process of identifying a complete inventory of arrangements containing a lease and accumulating the lease data necessary to apply the amended guidance. In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842) Land Easement Practical Expedient Transition to Topic 842 , an amendment to ASU 2016-2: Leases. The amendments in this Update permit an entity to elect an optional transition practical expedient to not evaluate under Topic 842 land easements that exist or expired before the entity’s adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. An entity that elects this practical expedient should apply the practical expedient consistently to all of its existing or expired land easements that were not previously accounted for as leases under Topic 840. Once an entity adopts Topic 842, it should apply that Topic prospectively to all new (or modified) land easements to determine whether the arrangement should be accounted for as a lease. An entity that does not elect this practical expedient should evaluate all existing or expired land easements in connection with the adoption of the new lease requirements in Topic 842 to assess whether they meet the definition of a lease. An entity should continue to apply its current accounting policy for accounting for land easements that existed before the entity’s adoption of Topic 842. For example, if an entity currently accounts for certain land easements as leases under Topic 840, it should continue to account for those land easements as leases before its adoption of Topic 842. The effective date and transition requirements for the amendments are the same as the effective date and transition requirements in Update 2016-02, for which the company is currently evaluating the impact. Note 1. Presentation of Financial Information, Continued Recently Issued Accounting Pronouncements (continued): In June 2016, FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU changed the credit loss model on financial instruments measured at amortized cost, available for sale securities and certain purchased financial instruments. Credit losses on financial instruments measured at amortized cost will be determined using a current expected credit loss model which requires the Company to measure all expected credit losses for financial instruments held at the reporting date based on historical experience, current conditions, and reasonable supportable forecasts. This replaces the existing incurred loss model and is applicable to the measurement of credit losses on financial assets measured at amortized cost and applies to some off-balance sheet credit exposures. Purchased financial assets with more-than-insignificant credit deterioration since origination ("PCD assets" which are currently named "PCI Loans") measured at amortized cost will have an allowance for credit losses established at acquisition as part of the purchase price. Subsequent increases or decreases to the allowance for credit losses on PCD assets will be recognized in the income statement. Interest income should be recognized on PCD assets based on the effective interest rate, determined excluding the discount attributed to credit losses at acquisition. Credit losses relating to available-for-sale debt securities will be recognized through an allowance for credit losses. The amount of the credit loss is limited to the amount by which fair value is below amortized cost of the available-for-sale debt security. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years for the Company and other SEC filers. Early adoption is permitted and if early adopted, all provisions must be adopted in the same period. The amendments should be applied through a cumulative-effect adjustment to retained earnings as of the beginning of the period adopted. A prospective approach is required for securities with other than temporary impairment recognized prior to adoption. The Company is continuing its implementation efforts through its Company-wide implementation team. The implementation team meets periodically to discuss the latest developments and ensure progress is being made. The team also keeps current on evolving interpretations and industry practices related to ASU 2016-13 via webcasts, publications, conferences, and peer bank meetings. The team continues to evaluate and validate data resources and different loss methodologies. The Company’s preliminary evaluation indicates the provisions of ASU No. 2016-13 are expected to impact the Company’s consolidated financial statements, in particular an increase to the level of the reserve for credit losses. However, the Company continues to evaluate the extent of the potential impact. In January 2017, FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The ASU simplifies the subsequent measurement of goodwill and eliminates Step 2 from the goodwill impairment test. The Company should perform its goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit's fair value. The impairment charge is limited to the amount of goodwill allocated to that reporting unit. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The Company does not expect these amendments to have a material effect on its consolidated financial statements. In March 2017, FASB issued ASU No. 2017-08, Receivables - Nonrefundable Fees and Other Costs (Topic 310-20): Premium Amortization on Purchased Callable Debt Securities. The ASU shortens the amortization period for certain callable debt securities held at a premium. The premium on individual callable debt securities shall be amortized to the earliest call date. This guidance does not apply to securities for which prepayments are estimated on a large number of similar loans where prepayments are probable and reasonably estimable. The amendments in this update are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. This update should be adopted on a modified retrospective basis with a cumulative-effect adjustment to retained earnings on the date of adoption. The Company does not expect these amendments to have a material effect on its consolidated financial statements. In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities, which amends the hedge accounting recognition and presentation requirements in Accounting Standards Codification (ASC) 815, Derivatives and Hedging. The goals of the ASU are to (1) improve the transparency and understandability of information conveyed to financial statement users about an entity’s risk management activities by better aligning the entity’s financial reporting for hedging relationships with those risk management activities and (2) reduce the complexity of and simplify the application of hedge accounting by preparers. The amendments will be effective for the Company for interim and annual periods beginning after December 15, 2018. The Company does not expect these amendments to have a material effect on its consolidated financial statements. Note 1. Presentation of Financial Information, Continued As part of its Simplification Initiative, the FASB has issued (ASU) No. 2018-07, Compensation-Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting. ASU No. 2018-07 expands the scope of Topic 718, Compensation-Stock Compensation (which previously only included payments to employees), to include share-based payment transactions for acquiring goods and services from non-employees. This required entities to apply the requirements of Topic 718 to non-employee awards, except for specific guidance on inputs to an option pricing model and the attribution of cost (i.e., the period of time over which share-based payment awards vest and the pattern of cost recognition over that period). Additionally, the amendments specify that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in the grantor’s own operations by issuing share-based payment awards, and clarify that Topic 718 does not apply to share-based payments used to effectively provide (1) financing to the issuer, or (2) awards granted in conjunction with selling goods or services to customers as part of a contract accounted for under Topic 606, Revenue from Contracts with Customers. The amendments are effective for fiscal years beginning after December 15, 2018, and for the interim periods within those years. The Company does not expect these amendments to have a material effect on its consolidated financial statements.
Reclassifications	Reclassifications: Certain captions and amounts in the 2017 consolidated financial statements were reclassified to conform to the 2018 presentation and these reclassifications had no impact on net income or equity as previously reported.
Earnings Per Common Share	Earnings per common share: Basic earnings per common share represents income available to common shareholders divided by the weighted-average number of common shares outstanding during the period. Diluted earnings per common share reflects additional common shares that would have been outstanding if dilutive potential common shares had been issued, as well as any adjustment to income that would result from the assumed issuance (excluding tax impact). Potential common shares that may be issued by the Company relate solely to outstanding stock options, determined using the treasury stock method, and restricted stock awards, determined by the fair value of the Company's stock on date of grant.

Business Combination (Tables)

6 Months Ended

Jun. 30, 2018

Business Combinations [Abstract]

Schedule of Allocation of Purchase Price to Fair Value of Net Assets Acquired

The following table details the financial impact of the merger, including the calculation of the purchase price, the allocation of the purchase price to the fair values of net assets assumed, and goodwill recognized:



Calculation of Purchase Price
Shares of SMBK common stock issued to Capstone shareholders as of November 1, 2017	2,908,094
Market price of SMBK common stock on November 1, 2017	$	23.49
Estimated fair value of SMBK common stock issued (in thousands)	68,311
Estimated fair value of Capstone stock options (in thousands)	1,585
Cash consideration paid	15,826
Total consideration (in thousands)	$	85,722



Allocation of Purchase Price (in thousands)
Total consideration above	$	85,722
Fair value of assets acquired and liabilities assumed:
Cash and cash equivalents	16,810
Investment securities available for sale	51,638
Restricted investments	1,049
Loans	413,023
Premises and equipment	8,668
Bank owned life insurance	10,031
Core deposit intangible	5,530
Other real estate owned	410
Prepaid and other assets	6,360
Deposits	(454,154		)
FHLB advances and other borrowings	(4,887		)
Payables and other liabilities	(6,803		)
Total fair value of net assets acquired	47,675
Goodwill	$	38,047

The following table details the financial impact of the merger, including the calculation of the purchase price, the allocation of the purchase price to the fair values of net assets assumed, and goodwill recognized:



Calculation of Purchase Price
Shares of SMBK common stock issued to TN Bancshares shareholders as of May 1, 2018	1,458,981
Market price of SMBK common stock on May 1, 2018	$	23.85
Estimated fair value of SMBK common stock issued (in thousands)	34,797
Cash consideration paid	5
Total consideration (in thousands)	$	34,802



Allocation of Purchase Price (in thousands)
Total consideration above	$	34,802
Fair value of assets acquired and liabilities assumed:
Cash and cash equivalents	5,723
Investment securities available for sale	24,563
Restricted investments	464
Loans	180,490
Premises and equipment	9,470
Core deposit intangible	2,290
Other real estate owned	674
Prepaid and other assets	2,258
Deposits	(202,272		)
FHLB advances and other borrowings	(4,000		)
Payables and other liabilities	(586		)
Total fair value of net assets acquired	19,074
Goodwill	$	15,728

The following table details the financial impact of the transaction, including the allocation of the purchase price to the fair values of net assets assumed and goodwill recognized:



Allocation of Purchase Price (in thousands)
Total consideration in cash	$	1,183
Fair value of assets acquired and liabilities assumed:
Cash and cash equivalents	133
Loans	24,073
Premises and equipment	2,839
Core deposit intangible	310
Prepaid and other assets	77
Deposits	(26,888		)
Payables and other liabilities	(21		)
Total fair value of net assets acquired	523
Goodwill	$	660

Earnings per share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following is a summary of the basic and diluted earnings per share for the three and six months ended June 30, 2018 and 2017.



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Net income available to common shareholders	$	3,931,556	$	1,648,286	$	7,346,326	$	3,097,138
Weighted average common shares outstanding	12,201,185		8,216,567		11,708,746		7,872,609
Effect of dilutive stock options	119,313		108,971		113,751		104,673
Diluted shares	12,320,498		8,325,538		11,822,497		7,977,282
Basic earnings per common share	$	0.32	$	0.20	$	0.63	$	0.39
Diluted earnings per common share	$	0.32	$	0.20	$	0.62	$	0.39

Securities (Tables)

6 Months Ended

Jun. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-For-Sale Securities Reconciliation

The amortized cost and fair value of securities available-for-sale at June 30, 2018 and December 31, 2017 are summarized as follows (in thousands):



	June 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Government-sponsored enterprises (GSEs)	$	29,137	$	—	$	(1,009	)	$	28,128
Municipal securities	15,896		8		(320		)	15,584
Other debt securities	976		—		(65		)	911
Mortgage-backed securities (GSEs)	114,538		171		(2,755		)	111,954
	$	160,547	$	179	$	(4,149	)	$	156,577



	December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Government-sponsored enterprises (GSEs)	$	26,207	$	1	$	(432	)	$	25,776
Municipal securities	9,122		28		(147		)	9,003
Other debt securities	974		—		(24		)	950
Mortgage-backed securities (GSEs)	117,263		136		(1,184		)	116,215
	$	153,566	$	165	$	(1,787	)	$	151,944

Investments Classified by Contractual Maturity Date

The amortized cost and estimated fair value of securities at June 30, 2018, by contractual maturity for non-mortgage backed securities, are shown below (in thousands). Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.



	Amortized Cost		Fair Value
Due in one year or less	$	—	$	—
Due from one year to five years	21,554		20,901
Due from five years to ten years	13,995		13,366
Due after ten years	10,460		10,356
	46,009		44,623
Mortgage-backed securities	114,538		111,954
	$	160,547	$	156,577

Schedule of Unrealized Loss on Investments

The following tables present the gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities available-for-sale have been in a continuous unrealized loss position, as of June 30, 2018 and December 31, 2017 (in thousands):



	As of June 30, 2018
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
U.S. Government- sponsored enterprises (GSEs)	$	14,862	$	(425	)	$	13,266	$	(584	)	$	28,128	$	(1,009	)
Municipal securities	11,966		(182		)	2,072		(138		)	14,038		(320		)
Other debt securities	—		—			911		(65		)	911		(65		)
Mortgage-backed securities (GSEs)	58,377		(1,654		)	29,911		(1,101		)	88,288		(2,755		)
	$	85,205	$	(2,261	)	$	46,160	$	(1,888	)	$	131,365	$	(4,149	)



	As of December 31, 2017
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
U.S. Government- sponsored enterprises (GSEs)	$	1,358	$	(1	)	$	13,420	$	(431	)	$	14,778	$	(432	)
Municipal securities	3,418		(43		)	2,112		(104		)	5,530		(147		)
Other debt securities	950		(24		)	—		—			950		(24		)
Mortgage-backed securities (GSEs)	61,332		(407		)	35,048		(777		)	96,380		(1,184		)
	$	67,058	$	(475	)	$	50,580	$	(1,312	)	$	117,638	$	(1,787	)

Loans and Allowance for Loan Losses (Tables)

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

At June 30, 2018 and December 31, 2017, loans are summarized as follows (in thousands):



	June 30, 2018									December 31, 2017
	PCI Loans¹			All Other Loans			Total			PCI Loans¹			All Other Loans			Total
Commercial real estate	$	18,474		$	727,390		$	745,864		$	17,903		$	625,085		$	642,988
Consumer real estate	6,987			348,889			355,876			7,450			286,007			293,457
Construction and land development	5,690			173,741			179,431			5,120			130,289			135,409
Commercial and industrial	821			278,950			279,771			858			237,229			238,087
Consumer and other	686			13,807			14,493			1,463			11,854			13,317
Total loans	32,658			1,542,777			1,575,435			32,794			1,290,464			1,323,258
Less: Allowance for loan losses	(19		)	(7,055		)	(7,074		)	(16		)	(5,844		)	(5,860		)
Loans, net	$	32,639		$	1,535,722		$	1,568,361		$	32,778		$	1,284,620		$	1,317,398

¹ Purchased Credit Impaired loans (“PCI loans”) are loans with evidence of credit deterioration at purchase.

Schedule of Impaired and Performing Loans Receivable

The composition of loans by loan classification for impaired and performing loan status at June 30, 2018 and December 31, 2017, is summarized in the tables below (in thousands):



	June 30, 2018
	Commercial Real Estate		Consumer Real Estate		Construction and Land Development		Commercial and Industrial		Consumer and Other		Total
Performing loans	$	726,356	$	347,893	$	173,194	$	278,431	$	13,698	$	1,539,572
Impaired loans	1,034		996		547		519		109		3,205
	727,390		348,889		173,741		278,950		13,807		1,542,777
PCI loans	18,474		6,987		5,690		821		686		32,658
Total	$	745,864	$	355,876	$	179,431	$	279,771	$	14,493	$	1,575,435



	December 31, 2017
	Commercial Real Estate		Consumer Real Estate		Construction and Land Development		Commercial and Industrial		Consumer and Other		Total
Performing loans	$	624,638	$	284,585	$	129,742	$	237,016	$	11,842	$	1,287,823
Impaired loans	447		1,422		547		213		12		2,641
	625,085		286,007		130,289		237,229		11,854		1,290,464
PCI loans	17,903		7,450		5,120		858		1,463		32,794
Total loans	$	642,988	$	293,457	$	135,409	$	238,087	$	13,317	$	1,323,258

Schedule of Allowance for Loan Losses for Impaired and Performing Loans Receivable

The following tables show the allowance for loan losses allocation by loan classification for impaired, PCI, and performing loans as of June 30, 2018 and December 31, 2017 (in thousands):



	June 30, 2018
	Commercial Real Estate		Consumer Real Estate		Construction and Land Development		Commercial and Industrial		Consumer and Other		Total
Performing loans	$	3,116	$	1,491	$	744	$	1,145	$	224	$	6,720
PCI loans	19		—		—		—		—		19
Impaired loans	—		37		—		222		76		335
Total	$	3,135	$	1,528	$	744	$	1,367	$	300	$	7,074



	December 31, 2017
	Commercial Real Estate		Consumer Real Estate		Construction and Land Development		Commercial and Industrial		Consumer and Other		Total
Performing loans	$	2,444	$	1,340	$	521	$	890	$	204	$	5,399
PCI loans	16		—		—		—		—		16
Impaired loans	5		256		—		172		12		445
Total	$	2,465	$	1,596	$	521	$	1,062	$	216	$	5,860

Schedule of Financing Receivable Allowance for Credit Losses

The following tables detail the changes in the allowance for loan losses for the six month period ending June 30, 2018 and year ending December 31, 2017, by loan classification (in thousands):



	June 30, 2018
	Commercial Real Estate			Consumer Real Estate			Construction and Land Development		Commercial and Industrial			Consumer and Other			Total
Beginning balance	$	2,465		$	1,596		$	521	$	1,062		$	216		$	5,860
Loans charged off	(38		)	(25		)	—		(78		)	(101		)	(242		)
Recoveries of loans charged off	—			50			5		56			40			151
Provision (reallocation) charged to expense	708			(93		)	218		327			145			1,305
Ending balance	$	3,135		$	1,528		$	744	$	1,367		$	300		$	7,074



	December 31, 2017
	Commercial Real Estate		Consumer Real Estate			Construction and Land Development			Commercial and Industrial			Consumer and Other			Total
Beginning balance	$	2,369	$	1,382		$	717		$	520		$	117		$	5,105
Loans charged off	—		(111		)	—			(24		)	(141		)	(276		)
Recoveries of charge-offs	8		99			13			67			61			248
Provision (reallocation) charged to expense	88		226			(209		)	499			179			783
Ending balance	$	2,465	$	1,596		$	521		$	1,062		$	216		$	5,860

Financing Receivable Credit Quality Indicators

The following tables outline the amount of each loan classification and the amount categorized into each risk rating as of June 30, 2018 and December 31, 2017 (in thousands):



	June 30, 2018
Non PCI Loans	Commercial Real Estate		Consumer Real Estate		Construction and Land Development		Commercial and Industrial		Consumer and Other		Total
Pass	$	724,763	$	343,407	$	172,972	$	277,384	$	13,184	$	1,531,710
Watch	1,604		3,168		62		1,035		123		5,992
Special mention	—		949		160		35		363		1,507
Substandard	1,023		1,365		547		483		111		3,529
Doubtful	—		—		—		13		26		39
Total	$	727,390	$	348,889	$	173,741	$	278,950	$	13,807	$	1,542,777



PCI Loans
Pass	$	14,494	$	4,558	$	3,973	$	210	$	565	$	23,800
Watch	1,513		898		653		2		18		3,084
Special mention	1,393		575		716		153		17		2,854
Substandard	1,074		956		348		456		86		2,920
Doubtful	—		—		—		—		—		—
Total	$	18,474	$	6,987	$	5,690	$	821	$	686	$	32,658
Total loans	$	745,864	$	355,876	$	179,431	$	279,771	$	14,493	$	1,575,435

Note 5. Loans and Allowance for Loan Losses, Continued

Credit Risk Management (continued):



	December 31, 2017
Non PCI Loans	Commercial Real Estate		Consumer Real Estate		Construction and Land Development		Commercial and Industrial		Consumer and Other		Total
Pass	$	616,028	$	279,464	$	129,359	$	233,942	$	11,624	$	1,270,417
Watch	7,673		2,543		383		3,007		62		13,668
Special mention	1,006		2,627		—		64		155		3,852
Substandard	378		1,159		547		157		—		2,241
Doubtful	—		214		—		59		13		286
Total	$	625,085	$	286,007	$	130,289	$	237,229	$	11,854	$	1,290,464



PCI Loans
Pass	$	14,386	$	4,151	$	4,134	$	68	$	819	$	23,558
Watch	261		1,345		649		120		262		2,637
Special mention	—		456		—		58		24		538
Substandard	3,084		1,192		337		588		107		5,308
Doubtful	172		306		—		24		251		753
Total	$	17,903	$	7,450	$	5,120	$	858	$	1,463	$	32,794
Total loans	$	642,988	$	293,457	$	135,409	$	238,087	$	13,317	$	1,323,258

Past Due Financing Receivables

The following tables present the aging of the recorded investment in loans as of June 30, 2018 and December 31, 2017 (in thousands):



	June 30, 2018
	30-89 Days Past Due and Accruing		Past Due 90 Days or More and Accruing		Nonaccrual		Total Past Due and NonAccrual		PCI Loans		Current Loans		Total Loans
Commercial real estate	$	2,628	$	82	$	6	$	2,716	$	18,474	$	724,674	$	745,864
Consumer real estate	701		76		463		1,240		6,987		347,649		355,876
Construction and land development	403		338		547		1,288		5,690		172,453		179,431
Commercial and industrial	647		113		430		1,190		821		277,760		279,771
Consumer and other	189		58		92		339		686		13,468		14,493
Total	$	4,568	$	667	$	1,538	$	6,773	$	32,658	$	1,536,004	$	1,575,435

Note 5. Loans and Allowance for Loan Losses, Continued

Past Due Loans (continued):



	December 31, 2017
	30-89 Days Past Due and Accruing		Past Due 90 Days or More and Accruing		Nonaccrual		Total Past Due and NonAccrual		PCI Loans		Current Loans		Total Loans
Commercial real estate	$	517	$	728	$	128	$	1,373	$	17,903	$	623,712	$	642,988
Consumer real estate	963		33		991		1,987		7,450		284,020		293,457
Construction and land development	65		326		547		938		5,120		129,351		135,409
Commercial and industrial	286		131		85		502		858		236,727		238,087
Consumer and other	165		291		13		469		1,463		11,385		13,317
Total	$	1,996	$	1,509	$	1,764	$	5,269	$	32,794	$	1,285,195	$	1,323,258

Impaired Financing Receivables

The following is an analysis of the impaired loan portfolio, excluding PCI loans, detailing the related allowance recorded as of June 30, 2018 and December 31, 2017 (in thousands):



							For the six months ended
	At June 30, 2018						June 30, 2018
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
Impaired loans without a valuation allowance:
Commercial real estate	$	1,034	$	1,043	$	—	$	670	$	15
Consumer real estate	793		823		—		699		12
Construction and land development	547		547		—		547		—
Commercial and industrial	81		83		—		58		3
Consumer and other	16		16		—		5		—
	2,471		2,512		—		1,979		30
Impaired loans with a valuation allowance:
Commercial real estate	—		—		—		8		—
Consumer real estate	203		216		37		642		11
Construction and land development	—		—		—		—		—
Commercial and industrial	438		440		222		257		5
Consumer and other	93		95		76		72		2
	734		751		335		979		18
PCI loans:
Commercial real estate	27		127		19		5		3
Total impaired loans	$	3,232	$	3,390	$	354	$	2,963	$	51

Note 5. Loans and Allowance for Loan Losses, Continued

Impaired Loans (continued):



							For the year ended
	At December 31, 2017						December 31, 2017
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
Impaired loans without a valuation allowance:
Commercial real estate	$	424	$	454	$	—	$	204	$	44
Consumer real estate	415		420		—		401		16
Construction and land development	547		547		—		628		—
Commercial and industrial	41		41		—		44		3
Consumer and other	—		—		—		—		—
	1,427		1,462		—		1,277		63
Impaired loans with a valuation allowance:
Commercial real estate	23		23		5		5		1
Consumer real estate	1,007		1,033		256		601		38
Construction and land development	—		—		—		—		—
Commercial and industrial	172		172		172		117		10
Consumer and other	12		13		12		2		1
	1,214		1,241		445		725		50
PCI loans:
Commercial real estate	16		123		16		3		16
Total impaired loans	$	2,657	$	2,826	$	461	$	2,005	$	129

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period, Carrying Amount of Loans

The Company has acquired loans which there was, at acquisition, evidence of deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected. The carrying amount of those loans as of is as follows (in thousands):



	June 30, 2018			December 31, 2017
Commercial real estate	$	25,700		$	23,366
Consumer real estate	9,620			10,764
Construction and land development	6,793			6,285
Commercial and industrial	2,973			1,452
Consumer and other	1,014			1,710
Total loans	46,100			43,577
Less remaining purchase discount	(13,442		)	(10,783		)
Total loans, net of purchase discount	32,658			32,794
Less: Allowance for loan losses	(19		)	(16		)
Carrying amount, net of allowance	$	32,639		$	32,778

Schedule of Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement

Activity related to the accretable yield on loans acquired with deteriorated credit quality is as follows for the three and six months period ended June 30, 2018 and 2017 (in thousands):



	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Accretable yield, beginning of period	$	7,780		$	8,482		$	9,287		$	8,950
Additions	1,292			—			1,292			—
Accretion income	(1,928		)	(973		)	(3,029		)	(1,670		)
Reclassification to accretable	120			366			382			610
Other changes, net	(58		)	600			(726		)	585
Accretable yield	$	7,206		$	8,475		$	7,206		$	8,475

Schedule of Certain Loans Acquired Accounted For As Debt Securities Acquired During Period

Purchased credit impaired loans acquired from Southern Community Bank during the three and six months period ended June 30, 2018 for which it was probable at acquisition that all contractually required payments would not be collected are as follows (in thousands):



	Three and Six Months Ended June 30,
	2018
Contractual principal and interest at acquisition	$	15,133
Nonaccretable difference	5,302
Expected cash flows at acquisition	9,831
Accretable yield	1,292
Fair value of purchased credit impaired loans	$	8,539

Commitments and Contingent Liabilities (Tables)

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Other Commitments

A summary of the Bank’s total contractual amount for all off-balance sheet commitments at June 30, 2018 is as follows:



Commitments to extend credit	$	299.6	million
Standby letters of credit	$	3.7	million

Fair Value Disclosures (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

Assets and liabilities recorded at fair value on a recurring basis are as follows (in thousands):



	Balance as of June 30, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
Debt securities available-for-sale:
U.S. Government-sponsored enterprises (GSEs)	$	28,128	$	—	$	28,128	$	—
Mortgage-backed securities	111,954		—		111,954		—
Other debt securities	911		—		911		—
Municipal securities	15,584		—		15,584		—
Total securities available-for-sale	$	156,577	$	—	$	156,577	$	—



	Balance as of December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
Debt securities available-for-sale:
U.S. Government-sponsored enterprises (GSEs)	$	25,776	$	—	$	25,776	$	—
Mortgage-backed securities	116,215		—		116,215		—
Other debt securities	950		—		950		—
Municipal securities	9,003		—		9,003		—
Total securities available-for-sale	$	151,944	$	—	$	151,944	$	—

Fair Value, Assets and Liabilities Measured on Non-Recurring Basis

For Level 3 assets measured at fair value on a non-recurring basis as of March 31, 2018 and December 31, 2017, , the significant unobservable inputs used in the fair value measurements are presented below (in thousands).



	Balance as of June 30, 2018		Valuation Technique	Significant Other Unobservable Input	Weighted Average of Input
Impaired loans	$	407	Appraisal and Cashflow	Appraisal and Cashflow Discounts	47	%
Foreclosed assets	3,524		Appraisal	Appraisal Discounts	19	%



	Balance as of December 31, 2017		Valuation Technique	Significant Other Unobservable Input	Weighted Average of Input
Impaired loans	$	769	Appraisal	Appraisal Discounts	36	%
Foreclosed assets	3,254		Appraisal	Appraisal Discounts	18	%

The following tables present the financial instruments carried on the consolidated balance sheets by caption and by level in the fair value hierarchy, for which a nonrecurring change in fair value has been recorded (in thousands):



	Balance as of June 30, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
Impaired loans	$	407	$	—	$	—	$	407
Foreclosed assets	3,524		—		—		3,524



	Balance as of December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
Impaired loans	$	769	$	—	$	—	$	769
Foreclosed assets	3,254		—		—		3,254

Fair Value, by Balance Sheet Grouping

The carrying amount and estimated fair value of the Company’s financial instruments at June 30, 2018 and December 31, 2017 are as follows (in thousands):



	June 30, 2018
			Fair Value Measurements Using
	Carrying Amount		Level 1	Level 2	Level 3	Estimated Fair Value
Assets:
Cash and cash equivalents	$	170,235	170,235	—	—	$	170,235
Securities available-for-sale	156,577		—	156,577	—	156,577
Restricted investments	8,273		N/A	N/A	N/A	N/A
Loans, net	1,568,361		—	—	1,569,916	1,569,916

Liabilities:
Noninterest-bearing demand deposits	301,318		—	301,318	—	301,318
Interest-bearing demand deposits	246,942		—	246,942	—	246,942
Money Market and Savings deposits	632,518		—	632,518	—	632,518
Time deposits	535,879		—	537,006	—	537,006
Securities sold under agreements to repurchase	18,635		—	18,635	—	18,635
Federal Home Loan Bank advances and other borrowings	72,040		—	72,040	—	72,040

Note 7. Fair Value Disclosures, Continued

Carrying value and estimated fair value (continued):



	December 31, 2017
			Fair Value Measurements Using
	Carrying Amount		Level 1	Level 2	Level 3	Estimated Fair Value
Assets:
Cash and cash equivalents	$	113,027	113,027	—	—	$	113,027
Securities available-for-sale	151,944		—	151,944	—	151,944
Restricted investments	6,431		N/A	N/A	N/A	N/A
Loans, net	1,317,398		—	—	1,292,303	1,292,303

Liabilities:
Noninterest-bearing demand deposits	220,520		—	220,520	—	250,520
Interest-bearing demand deposits	231,644		—	231,644	—	231,644
Money Market and Savings deposits	543,645		—	543,645	—	543,645
Time deposits	442,774		—	443,547	—	443,547
Securities sold under agreements to repurchase	24,055		—	24,055	—	24,055
Federal Home Loan Bank advances and other borrowings	43,600		—	43,600	—	43,600

Presentation of Financial Information - Additional Details (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Gross interchange and debit card transaction fees	$ 401,000			$ 733,000
Network costs	280,000		$ 140,000	467,000	$ 227,000
Interchange and debit card transaction fees	$ 121,219		$ 223,329	$ 266,754	$ 415,722
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect		$ 197,000

Business Combination - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended		6 Months Ended
	May 01, 2018	Apr. 27, 2018	Nov. 01, 2017	May 19, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Fair value adjustment					$ 11
Atlantic Capital Bank, N.A. [Member]
Business Acquisition [Line Items]
Cash consideration paid				$ 1,183
Pro-forma revenue					381		$ 754
Pro-forma net income					105		194
Goodwill				$ 660
Capstone Bancshares Inc. [Member]
Business Acquisition [Line Items]
Cash consideration paid			$ 15,826
Pro-forma revenue					7,600		14,500
Pro-forma net income					$ 3,400		6,000
Exchange of shares			0.85
Cash payment per share (in dollars per share)			$ 18.50
Percentage of common stock consideration transferred			80.00%
Percentage of cash consideration transferred			20.00%
Voting interests acquired			74.00%
Goodwill			$ 38,047
Pro forma revenue, acquisition						$ 6,200		$ 12,500
Pro forma net income (loss)						237		473
Estimated common stock issued (in shares)			2,908,094
Market price of SMBK common stock (in dollars per share)			$ 23.49
Tennessee Bancshares [Member]
Business Acquisition [Line Items]
Cash consideration paid	$ 5
Pro-forma revenue							2,400
Pro-forma net income							800
Voting interests acquired	88.60%
Goodwill	$ 15,728
Pro forma revenue, acquisition						3,700		7,300
Pro forma net income (loss)						$ 909		$ 1,800
Common shares converted (in shares)	0.8065
Estimated common stock issued (in shares)	1,458,981
Consecutive trading days		10 days
Market price of SMBK common stock (in dollars per share)	$ 23.85
Weighted Average [Member] \| Tennessee Bancshares [Member]
Business Acquisition [Line Items]
Market price of SMBK common stock (in dollars per share)		$ 23.92
Pro Forma [Member] \| Capstone Bancshares Inc. [Member]
Business Acquisition [Line Items]
Expenses							4,600
Pro Forma [Member] \| Tennessee Bancshares [Member]
Business Acquisition [Line Items]
Expenses							$ 1,300

Business Combination - Atlantic Capital Bank, N.A. Allocation of Purchase Price (Details) - Atlantic Capital Bank, N.A. [Member] $ in Thousands	May 19, 2017 USD ($)
Business Acquisition [Line Items]
Cash consideration paid	$ 1,183
Fair value of assets acquired and liabilities assumed:
Cash and cash equivalents	133
Loans	24,073
Premises and equipment	2,839
Core deposit intangible	310
Prepaid and other assets	77
Deposits	(26,888)
Payables and other liabilities	(21)
Total fair value of net assets acquired	523
Goodwill	$ 660

Business Combination - Capstone Merger (Details) - Capstone Bancshares Inc. [Member] $ / shares in Units, $ in Thousands	Nov. 01, 2017 USD ($) $ / shares shares
Business Acquisition [Line Items]
Estimated common stock issued (in shares) \| shares	2,908,094
Market price of SMBK common stock (in dollars per share) \| $ / shares	$ 23.49
Estimated fair value of SMBK common stock issued (in shares)	$ 68,311
Estimated fair value of Capstone stock options	1,585
Cash consideration paid	15,826
Total consideration	85,722
Fair value of assets acquired and liabilities assumed:
Cash and cash equivalents	16,810
Investment securities available for sale	51,638
Restricted investments	1,049
Loans	413,023
Premises and equipment	8,668
Bank owned life insurance	10,031
Core deposit intangible	5,530
Other real estate owned	410
Prepaid and other assets	6,360
Deposits	(454,154)
FHLB advances and other borrowings	(4,887)
Payables and other liabilities	(6,803)
Total fair value of net assets acquired	47,675
Goodwill	$ 38,047

Business Combination - Tennessee Bancshares Merger (Details) - Tennessee Bancshares [Member] $ / shares in Units, $ in Thousands	May 01, 2018 USD ($) $ / shares shares
Business Acquisition [Line Items]
Shares of SMBK common stock issued to TN Bancshares shareholders as of May 1, 2018 (in shares) \| shares	1,458,981
Market price of SMBK common stock on May 1, 2018 (in dollars per share) \| $ / shares	$ 23.85
Estimated fair value of SMBK common stock issued (in shares)	$ 34,797
Cash consideration paid	5
Total consideration	34,802
Fair value of assets acquired and liabilities assumed:
Cash and cash equivalents	5,723
Investment securities available for sale	24,563
Restricted investments	464
Loans	180,490
Premises and equipment	9,470
Core deposit intangible	2,290
Other real estate owned	674
Prepaid and other assets	2,258
Deposits	(202,272)
FHLB advances and other borrowings	(4,000)
Payables and other liabilities	(586)
Total fair value of net assets acquired	19,074
Goodwill	$ 15,728

Earnings per share - Basic and Diluted (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 3,931,556	$ 1,648,286	$ 7,346,326	$ 3,097,138
Weighted average common shares outstanding (in shares)	12,201,185	8,216,567	11,708,746	7,872,609
Effect of dilutive stock options (in shares)	119,313	108,971	113,751	104,673
Diluted shares (in shares)	12,320,498	8,325,538	11,822,497	7,977,282
Basic earnings per common share (in dollars per share)	$ 0.32	$ 0.20	$ 0.63	$ 0.39
Diluted earnings per common share (in dollars per share)	$ 0.32	$ 0.20	$ 0.62	$ 0.39

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

Earnings per share - Narrative (Details) - shares	3 Months Ended		6 Months Ended
Earnings per share - Narrative (Details) - shares	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	0	13,916	0	13,916

Securities - Amortized Cost and Fair Value of Available-for-sale Securities (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 160,547,000	$ 153,566,000
Gross Unrealized Gains	179,000	165,000
Gross Unrealized Losses	(4,149,000)	(1,787,000)
Fair Value	156,577,182	151,944,567
U.S. Government-sponsored enterprises (GSEs) [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,137,000	26,207,000
Gross Unrealized Gains	0	1,000
Gross Unrealized Losses	(1,009,000)	(432,000)
Fair Value	28,128,000	25,776,000
Municipal securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,896,000	9,122,000
Gross Unrealized Gains	8,000	28,000
Gross Unrealized Losses	(320,000)	(147,000)
Fair Value	15,584,000	9,003,000
Other debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	976,000	974,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(65,000)	(24,000)
Fair Value	911,000	950,000
Mortgage-backed securities (GSEs) [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	114,538,000	117,263,000
Gross Unrealized Gains	171,000	136,000
Gross Unrealized Losses	(2,755,000)	(1,184,000)
Fair Value	$ 111,954,000	$ 116,215,000

Securities - Narrative (Details)	3 Months Ended		6 Months Ended
Securities - Narrative (Details)	Jun. 30, 2018 USD ($) investment	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) investment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Proceeds from sale of available-for-sale securities \| $	$ 0	$ 0	$ 0	$ 0
Loss from redemption of securities \| $	1,200		1,200	$ 0
Collateral Pledged [Member]
Loans and Leases Receivable Disclosure [Line Items]
Restricted securities \| $	$ 113,500,000		$ 113,500,000		$ 97,200,000
Mortgage-backed securities [Member]
Loans and Leases Receivable Disclosure [Line Items]
Number of positions	65		65
US Government-sponsored Enterprises Debt Securities [Member]
Loans and Leases Receivable Disclosure [Line Items]
Number of positions	8		8
Municipal securities [Member]
Loans and Leases Receivable Disclosure [Line Items]
Number of positions	21		21
Other debt securities [Member]
Loans and Leases Receivable Disclosure [Line Items]
Number of positions	1		1

Securities - Available-for-sale Securities by Contractual Maturity (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Securities Available for Sale, Due in one year or less, Amortized Cost	$ 0
Securities Available for Sale, Due from one year to five years, Amortized Cost	21,554,000
Securities Available for Sale, Due from five years to ten years, Amortized Cost	13,995,000
Securities Available for Sale, Due after ten years, Amortized Cost	10,460,000
Securities Available for Sale, Debt Securities, Amortized Cost	46,009,000
Amortized Cost	160,547,000	$ 153,566,000
Securities Available for Sale, Due in one year or less, Fair Value	0
Securities Available for Sale, Due from one year to five years, Fair Value	20,901,000
Securities Available for Sale, Due from five years to ten years, Fair Value	13,366,000
Securities Available for Sale, Due after ten years, Fair Value	10,356,000
Securities Available for Sale, Debt Securities, Fair Value	44,623,000
Securities available for sale	156,577,182	$ 151,944,567
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities Available for Sale, Mortgage-backed securities, Amortized Cost	114,538,000
Securities Available for Sale, Mortgage-backed securities, Fair Value	$ 111,954,000

Securities - Available-for-sale Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, fair value, less than 12 months	$ 85,205	$ 67,058
Available-for-sale, gross unrealized losses, less than 12 months	(2,261)	(475)
Available-for-sale, fair value, 12 months or greater	46,160	50,580
Available-for-sale, gross unrealized losses, 12 months or greater	(1,888)	(1,312)
Securities available for sale	131,365	117,638
Available-for-sale, gross unrealized losses, total	(4,149)	(1,787)
U.S. Government-sponsored enterprises (GSEs) [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, fair value, less than 12 months	14,862	1,358
Available-for-sale, gross unrealized losses, less than 12 months	(425)	(1)
Available-for-sale, fair value, 12 months or greater	13,266	13,420
Available-for-sale, gross unrealized losses, 12 months or greater	(584)	(431)
Securities available for sale	28,128	14,778
Available-for-sale, gross unrealized losses, total	(1,009)	(432)
Municipal securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, fair value, less than 12 months	11,966	3,418
Available-for-sale, gross unrealized losses, less than 12 months	(182)	(43)
Available-for-sale, fair value, 12 months or greater	2,072	2,112
Available-for-sale, gross unrealized losses, 12 months or greater	(138)	(104)
Securities available for sale	14,038	5,530
Available-for-sale, gross unrealized losses, total	(320)	(147)
Other debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, fair value, less than 12 months	0	950
Available-for-sale, gross unrealized losses, less than 12 months	0	(24)
Available-for-sale, fair value, 12 months or greater	911	0
Available-for-sale, gross unrealized losses, 12 months or greater	(65)	0
Securities available for sale	911	950
Available-for-sale, gross unrealized losses, total	(65)	(24)
Mortgage-backed securities (GSEs) [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, fair value, less than 12 months	58,377	61,332
Available-for-sale, gross unrealized losses, less than 12 months	(1,654)	(407)
Available-for-sale, fair value, 12 months or greater	29,911	35,048
Available-for-sale, gross unrealized losses, 12 months or greater	(1,101)	(777)
Securities available for sale	88,288	96,380
Available-for-sale, gross unrealized losses, total	$ (2,755)	$ (1,184)

Loans and Allowance for Loan Losses - Loan Summary (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,575,435,000	$ 1,323,258,000
Less: Allowance for loan losses	(7,073,937)	(5,860,291)	$ (5,105,000)
Loans, net	1,568,360,556	1,317,397,909
Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	32,658,000	32,794,000
Less: Allowance for loan losses	(19,000)	(16,000)
Loans, net	32,639,000	32,778,000
All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,542,777,000	1,290,464,000
Less: Allowance for loan losses	(7,055,000)	(5,844,000)
Loans, net	1,535,722,000	1,284,620,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	745,864,000	642,988,000
Less: Allowance for loan losses	(3,135,000)	(2,465,000)	(2,369,000)
Commercial Real Estate [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	18,474,000	17,903,000
Less: Allowance for loan losses	(19,000)	(16,000)
Commercial Real Estate [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	727,390,000	625,085,000
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	355,876,000	293,457,000
Less: Allowance for loan losses	(1,528,000)	(1,596,000)	(1,382,000)
Consumer Real Estate [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	6,987,000	7,450,000
Less: Allowance for loan losses	0	0
Consumer Real Estate [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	348,889,000	286,007,000
Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	179,431,000	135,409,000
Less: Allowance for loan losses	(744,000)	(521,000)	(717,000)
Construction and Land Development [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,690,000	5,120,000
Less: Allowance for loan losses	0	0
Construction and Land Development [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	173,741,000	130,289,000
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	279,771,000	238,087,000
Less: Allowance for loan losses	(1,367,000)	(1,062,000)	(520,000)
Commercial and Industrial [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	821,000	858,000
Less: Allowance for loan losses	0	0
Commercial and Industrial [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	278,950,000	237,229,000
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	14,493,000	13,317,000
Less: Allowance for loan losses	(300,000)	(216,000)	$ (117,000)
Consumer and Other [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	686,000	1,463,000
Less: Allowance for loan losses	0	0
Consumer and Other [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 13,807,000	$ 11,854,000

Loans and Allowance for Loan Losses - Narrative (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($) loan segment	Dec. 31, 2017 USD ($) contract	Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items]
Loan portfolio segments \| segment	5
Allowance for loan losses	$ 7,073,937	$ 5,860,291	$ 5,105,000
Number of contracts \| contract		0
Foreclosed assets	3,524,239	$ 3,254,392
Trouble Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Loans that met criteria for restructured	$ 660,000	$ 41,000
Number of contracts, nonaccrual \| loan	0
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Foreclosed assets	$ 1,140,000
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans that met criteria for restructured	$ 622,000
Number of contracts \| loan	1

Loans and Allowance for Loan Losses - Performing and Impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,575,435	$ 1,323,258
All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,542,777	1,290,464
Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	32,658	32,794
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	745,864	642,988
Commercial Real Estate [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	727,390	625,085
Commercial Real Estate [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	18,474	17,903
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	355,876	293,457
Consumer Real Estate [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	348,889	286,007
Consumer Real Estate [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	6,987	7,450
Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	179,431	135,409
Construction and Land Development [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	173,741	130,289
Construction and Land Development [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,690	5,120
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	279,771	238,087
Commercial and Industrial [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	278,950	237,229
Commercial and Industrial [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	821	858
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	14,493	13,317
Consumer and Other [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	13,807	11,854
Consumer and Other [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	686	1,463
Performing [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,539,572	1,287,823
Performing [Member] \| Commercial Real Estate [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	726,356	624,638
Performing [Member] \| Consumer Real Estate [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	347,893	284,585
Performing [Member] \| Construction and Land Development [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	173,194	129,742
Performing [Member] \| Commercial and Industrial [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	278,431	237,016
Performing [Member] \| Consumer and Other [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	13,698	11,842
Impaired Loans [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,205	2,641
Impaired Loans [Member] \| Commercial Real Estate [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,034	447
Impaired Loans [Member] \| Consumer Real Estate [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	996	1,422
Impaired Loans [Member] \| Construction and Land Development [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	547	547
Impaired Loans [Member] \| Commercial and Industrial [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	519	213
Impaired Loans [Member] \| Consumer and Other [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 109	$ 12

Loans and Allowance for Loan Losses - ALL by Loan Classification (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 7,073,937	$ 5,860,291	$ 5,105,000
All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	7,055,000	5,844,000
Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	19,000	16,000
Performing [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	6,720,000	5,399,000
Impaired Loans [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	335,000	445,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,135,000	2,465,000	2,369,000
Commercial Real Estate [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	19,000	16,000
Commercial Real Estate [Member] \| Performing [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,116,000	2,444,000
Commercial Real Estate [Member] \| Impaired Loans [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	5,000
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,528,000	1,596,000	1,382,000
Consumer Real Estate [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Consumer Real Estate [Member] \| Performing [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,491,000	1,340,000
Consumer Real Estate [Member] \| Impaired Loans [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	37,000	256,000
Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	744,000	521,000	717,000
Construction and Land Development [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Construction and Land Development [Member] \| Performing [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	744,000	521,000
Construction and Land Development [Member] \| Impaired Loans [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,367,000	1,062,000	520,000
Commercial and Industrial [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Commercial and Industrial [Member] \| Performing [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,145,000	890,000
Commercial and Industrial [Member] \| Impaired Loans [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	222,000	172,000
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	300,000	216,000	$ 117,000
Consumer and Other [Member] \| Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Consumer and Other [Member] \| Performing [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	224,000	204,000
Consumer and Other [Member] \| Impaired Loans [Member] \| All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 76,000	$ 12,000

Loans and Allowance for Loan Losses - ALL Roll Forward (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 5,860,291	$ 5,105,000	$ 5,105,000
Loans charged off	(242,000)		(276,000)
Recoveries of loans charged off	151,000		248,000
Provision (reallocation) charged to expense	1,305,397	310,482	783,000
Ending balance	7,073,937		5,860,291
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,465,000	2,369,000	2,369,000
Loans charged off	(38,000)		0
Recoveries of loans charged off	0		8,000
Provision (reallocation) charged to expense	708,000		88,000
Ending balance	3,135,000		2,465,000
Consumer Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,596,000	1,382,000	1,382,000
Loans charged off	(25,000)		(111,000)
Recoveries of loans charged off	50,000		99,000
Provision (reallocation) charged to expense	(93,000)		226,000
Ending balance	1,528,000		1,596,000
Construction and Land Development [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	521,000	717,000	717,000
Loans charged off	0		0
Recoveries of loans charged off	5,000		13,000
Provision (reallocation) charged to expense	218,000		(209,000)
Ending balance	744,000		521,000
Commercial and Industrial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,062,000	520,000	520,000
Loans charged off	(78,000)		(24,000)
Recoveries of loans charged off	56,000		67,000
Provision (reallocation) charged to expense	327,000		499,000
Ending balance	1,367,000		1,062,000
Consumer and Other [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	216,000	$ 117,000	117,000
Loans charged off	(101,000)		(141,000)
Recoveries of loans charged off	40,000		61,000
Provision (reallocation) charged to expense	145,000		179,000
Ending balance	$ 300,000		$ 216,000

Loans and Allowance for Loan Losses - Loan Risk Rating (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1,575,435	$ 1,323,258
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	745,864	642,988
Consumer Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	355,876	293,457
Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	179,431	135,409
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	279,771	238,087
Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	14,493	13,317
Non PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,542,777	1,290,464
Non PCI Loans [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,531,710	1,270,417
Non PCI Loans [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,992	13,668
Non PCI Loans [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,507	3,852
Non PCI Loans [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,529	2,241
Non PCI Loans [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	39	286
Non PCI Loans [Member] \| Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	727,390	625,085
Non PCI Loans [Member] \| Commercial Real Estate [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	724,763	616,028
Non PCI Loans [Member] \| Commercial Real Estate [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,604	7,673
Non PCI Loans [Member] \| Commercial Real Estate [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	1,006
Non PCI Loans [Member] \| Commercial Real Estate [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,023	378
Non PCI Loans [Member] \| Commercial Real Estate [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non PCI Loans [Member] \| Consumer Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	348,889	286,007
Non PCI Loans [Member] \| Consumer Real Estate [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	343,407	279,464
Non PCI Loans [Member] \| Consumer Real Estate [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,168	2,543
Non PCI Loans [Member] \| Consumer Real Estate [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	949	2,627
Non PCI Loans [Member] \| Consumer Real Estate [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,365	1,159
Non PCI Loans [Member] \| Consumer Real Estate [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	214
Non PCI Loans [Member] \| Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	173,741	130,289
Non PCI Loans [Member] \| Construction and Land Development [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	172,972	129,359
Non PCI Loans [Member] \| Construction and Land Development [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	62	383
Non PCI Loans [Member] \| Construction and Land Development [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	160	0
Non PCI Loans [Member] \| Construction and Land Development [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	547	547
Non PCI Loans [Member] \| Construction and Land Development [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Non PCI Loans [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	278,950	237,229
Non PCI Loans [Member] \| Commercial and Industrial [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	277,384	233,942
Non PCI Loans [Member] \| Commercial and Industrial [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,035	3,007
Non PCI Loans [Member] \| Commercial and Industrial [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	35	64
Non PCI Loans [Member] \| Commercial and Industrial [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	483	157
Non PCI Loans [Member] \| Commercial and Industrial [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13	59
Non PCI Loans [Member] \| Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,807	11,854
Non PCI Loans [Member] \| Consumer and Other [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,184	11,624
Non PCI Loans [Member] \| Consumer and Other [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	123	62
Non PCI Loans [Member] \| Consumer and Other [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	363	155
Non PCI Loans [Member] \| Consumer and Other [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	111	0
Non PCI Loans [Member] \| Consumer and Other [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	26	13
Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	32,658	32,794
Purchased Credit Impaired Loans [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	23,800	23,558
Purchased Credit Impaired Loans [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,084	2,637
Purchased Credit Impaired Loans [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,854	538
Purchased Credit Impaired Loans [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,920	5,308
Purchased Credit Impaired Loans [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	753
Purchased Credit Impaired Loans [Member] \| Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	18,474	17,903
Purchased Credit Impaired Loans [Member] \| Commercial Real Estate [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	14,494	14,386
Purchased Credit Impaired Loans [Member] \| Commercial Real Estate [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,513	261
Purchased Credit Impaired Loans [Member] \| Commercial Real Estate [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,393	0
Purchased Credit Impaired Loans [Member] \| Commercial Real Estate [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,074	3,084
Purchased Credit Impaired Loans [Member] \| Commercial Real Estate [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	172
Purchased Credit Impaired Loans [Member] \| Consumer Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,987	7,450
Purchased Credit Impaired Loans [Member] \| Consumer Real Estate [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,558	4,151
Purchased Credit Impaired Loans [Member] \| Consumer Real Estate [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	898	1,345
Purchased Credit Impaired Loans [Member] \| Consumer Real Estate [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	575	456
Purchased Credit Impaired Loans [Member] \| Consumer Real Estate [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	956	1,192
Purchased Credit Impaired Loans [Member] \| Consumer Real Estate [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	306
Purchased Credit Impaired Loans [Member] \| Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,690	5,120
Purchased Credit Impaired Loans [Member] \| Construction and Land Development [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,973	4,134
Purchased Credit Impaired Loans [Member] \| Construction and Land Development [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	653	649
Purchased Credit Impaired Loans [Member] \| Construction and Land Development [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	716	0
Purchased Credit Impaired Loans [Member] \| Construction and Land Development [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	348	337
Purchased Credit Impaired Loans [Member] \| Construction and Land Development [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Purchased Credit Impaired Loans [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	821	858
Purchased Credit Impaired Loans [Member] \| Commercial and Industrial [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	210	68
Purchased Credit Impaired Loans [Member] \| Commercial and Industrial [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2	120
Purchased Credit Impaired Loans [Member] \| Commercial and Industrial [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	153	58
Purchased Credit Impaired Loans [Member] \| Commercial and Industrial [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	456	588
Purchased Credit Impaired Loans [Member] \| Commercial and Industrial [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	24
Purchased Credit Impaired Loans [Member] \| Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	686	1,463
Purchased Credit Impaired Loans [Member] \| Consumer and Other [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	565	819
Purchased Credit Impaired Loans [Member] \| Consumer and Other [Member] \| Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	18	262
Purchased Credit Impaired Loans [Member] \| Consumer and Other [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	17	24
Purchased Credit Impaired Loans [Member] \| Consumer and Other [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	86	107
Purchased Credit Impaired Loans [Member] \| Consumer and Other [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 0	$ 251

Loans and Allowance for Loan Losses - Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 1,538	$ 1,764
Total Past Due and NonAccrual	6,773	5,269
Current Loans	1,536,004	1,285,195
Total loans	1,575,435	1,323,258
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	6	128
Total Past Due and NonAccrual	2,716	1,373
Current Loans	724,674	623,712
Total loans	745,864	642,988
Consumer Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	463	991
Total Past Due and NonAccrual	1,240	1,987
Current Loans	347,649	284,020
Total loans	355,876	293,457
Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	547	547
Total Past Due and NonAccrual	1,288	938
Current Loans	172,453	129,351
Total loans	179,431	135,409
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	430	85
Total Past Due and NonAccrual	1,190	502
Current Loans	277,760	236,727
Total loans	279,771	238,087
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	92	13
Total Past Due and NonAccrual	339	469
Current Loans	13,468	11,385
Total loans	14,493	13,317
Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	32,658	32,794
Purchased Credit Impaired Loans [Member] \| Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	18,474	17,903
Purchased Credit Impaired Loans [Member] \| Consumer Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	6,987	7,450
Purchased Credit Impaired Loans [Member] \| Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	5,690	5,120
Purchased Credit Impaired Loans [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	821	858
Purchased Credit Impaired Loans [Member] \| Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	686	1,463
30-89 Days Past Due and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	4,568	1,996
30-89 Days Past Due and Accruing [Member] \| Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	2,628	517
30-89 Days Past Due and Accruing [Member] \| Consumer Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	701	963
30-89 Days Past Due and Accruing [Member] \| Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	403	65
30-89 Days Past Due and Accruing [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	647	286
30-89 Days Past Due and Accruing [Member] \| Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	189	165
Past Due 90 Days or More and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	667	1,509
Past Due 90 Days or More and Accruing [Member] \| Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	82	728
Past Due 90 Days or More and Accruing [Member] \| Consumer Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	76	33
Past Due 90 Days or More and Accruing [Member] \| Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	338	326
Past Due 90 Days or More and Accruing [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	113	131
Past Due 90 Days or More and Accruing [Member] \| Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	$ 58	$ 291

Loans and Allowance for Loan Losses - Impaired Loan Portfolio (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Impaired loans with a valuation allowance, Related Allowance	$ 354	$ 461
Total impaired loans, Recorded Investment	3,232	2,657
Total impaired loans, Unpaid Principal Balance	3,390	2,826
Total impaired loans, Average Recorded Investment	2,963	2,005
Total impaired loans, Interest Income Recognized	51	129
Non PCI Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	2,471	1,427
Impaired loans without a valuation allowance, Unpaid Principal Balance	2,512	1,462
Impaired loans without a valuation allowance, Average Recorded Investment	1,979	1,277
Impaired loans without a valuation allowance, Interest Income Recognized	30	63
Impaired loans with a valuation allowance, Recorded Investment	734	1,214
Impaired loans with a valuation allowance, Unpaid Principal Balance	751	1,241
Impaired loans with a valuation allowance, Related Allowance	335	445
Impaired loans with a valuation allowance, Average Recorded Investment	979	725
Impaired loans with a valuation allowance, Interest Income Recognized	18	50
Non PCI Loans [Member] \| Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	1,034	424
Impaired loans without a valuation allowance, Unpaid Principal Balance	1,043	454
Impaired loans without a valuation allowance, Average Recorded Investment	670	204
Impaired loans without a valuation allowance, Interest Income Recognized	15	44
Impaired loans with a valuation allowance, Recorded Investment	0	23
Impaired loans with a valuation allowance, Unpaid Principal Balance	0	23
Impaired loans with a valuation allowance, Related Allowance	0	5
Impaired loans with a valuation allowance, Average Recorded Investment	8	5
Impaired loans with a valuation allowance, Interest Income Recognized	0	1
Non PCI Loans [Member] \| Consumer Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	793	415
Impaired loans without a valuation allowance, Unpaid Principal Balance	823	420
Impaired loans without a valuation allowance, Average Recorded Investment	699	401
Impaired loans without a valuation allowance, Interest Income Recognized	12	16
Impaired loans with a valuation allowance, Recorded Investment	203	1,007
Impaired loans with a valuation allowance, Unpaid Principal Balance	216	1,033
Impaired loans with a valuation allowance, Related Allowance	37	256
Impaired loans with a valuation allowance, Average Recorded Investment	642	601
Impaired loans with a valuation allowance, Interest Income Recognized	11	38
Non PCI Loans [Member] \| Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	547	547
Impaired loans without a valuation allowance, Unpaid Principal Balance	547	547
Impaired loans without a valuation allowance, Average Recorded Investment	547	628
Impaired loans without a valuation allowance, Interest Income Recognized	0	0
Impaired loans with a valuation allowance, Recorded Investment	0	0
Impaired loans with a valuation allowance, Unpaid Principal Balance	0	0
Impaired loans with a valuation allowance, Related Allowance	0	0
Impaired loans with a valuation allowance, Average Recorded Investment	0	0
Impaired loans with a valuation allowance, Interest Income Recognized	0	0
Non PCI Loans [Member] \| Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	81	41
Impaired loans without a valuation allowance, Unpaid Principal Balance	83	41
Impaired loans without a valuation allowance, Average Recorded Investment	58	44
Impaired loans without a valuation allowance, Interest Income Recognized	3	3
Impaired loans with a valuation allowance, Recorded Investment	438	172
Impaired loans with a valuation allowance, Unpaid Principal Balance	440	172
Impaired loans with a valuation allowance, Related Allowance	222	172
Impaired loans with a valuation allowance, Average Recorded Investment	257	117
Impaired loans with a valuation allowance, Interest Income Recognized	5	10
Non PCI Loans [Member] \| Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	16	0
Impaired loans without a valuation allowance, Unpaid Principal Balance	16	0
Impaired loans without a valuation allowance, Average Recorded Investment	5	0
Impaired loans without a valuation allowance, Interest Income Recognized	0	0
Impaired loans with a valuation allowance, Recorded Investment	93	12
Impaired loans with a valuation allowance, Unpaid Principal Balance	95	13
Impaired loans with a valuation allowance, Related Allowance	76	12
Impaired loans with a valuation allowance, Average Recorded Investment	72	2
Impaired loans with a valuation allowance, Interest Income Recognized	2	1
Purchased Credit Impaired Loans [Member] \| Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with a valuation allowance, Recorded Investment	27	16
Impaired loans with a valuation allowance, Unpaid Principal Balance	127	123
Impaired loans with a valuation allowance, Related Allowance	19	16
Impaired loans with a valuation allowance, Average Recorded Investment	5	3
Impaired loans with a valuation allowance, Interest Income Recognized	$ 3	$ 16

Loans and Allowance for Loan Losses - Purchased Credit Impaired Loans (Details) - Purchased Credit Impaired Loans [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total loans	$ 46,100	$ 43,577
Less remaining purchase discount	(13,442)	(10,783)
Total loans, net of purchase discount	32,658	32,794
Less: Allowance for loan losses	(19)	(16)
Carrying amount, net of allowance	32,639	32,778
Commercial Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total loans	25,700	23,366
Consumer Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total loans	9,620	10,764
Construction and Land Development [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total loans	6,793	6,285
Commercial and Industrial [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total loans	2,973	1,452
Consumer and Other [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total loans	$ 1,014	$ 1,710

Loans and Allowance for Loan Losses - Accretable Yield Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield	$ 1,292		$ 1,292
Purchased Credit Impaired Loans [Member]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield, beginning of period	7,780	$ 8,482	9,287	$ 8,950
Additions	1,292	0	1,292	0
Accretion income	(1,928)	(973)	(3,029)	(1,670)
Reclassification to accretable	120	366	382	610
Other changes, net	(58)	600	(726)	585
Accretable yield	$ 7,206	$ 8,475	$ 7,206	$ 8,475

Loans and Allowance for Loan Losses - Southern Community Bank Purchased Credit Impaired Loans (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Receivables [Abstract]
Contractual principal and interest at acquisition	$ 15,133
Nonaccretable difference	5,302
Expected cash flows at acquisition	9,831
Accretable yield	1,292
Fair value of purchased credit impaired loans	$ 8,539

Commitments and Contingent Liabilities (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Line of Credit Facility [Line Items]
Commitments to extend credit	$ 299.6
Standby letters of credit	$ 3.7
Standby Letters of Credit [Member]
Line of Credit Facility [Line Items]
Standby letter of credit term, or less	2 years

Fair Value Disclosures - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	$ 156,577,182	$ 151,944,567
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	156,577,000	151,944,000
Significant Other Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	0	0
U.S. Government-sponsored enterprises (GSEs) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	28,128,000	25,776,000
U.S. Government-sponsored enterprises (GSEs) [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	0	0
U.S. Government-sponsored enterprises (GSEs) [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	28,128,000	25,776,000
U.S. Government-sponsored enterprises (GSEs) [Member] \| Significant Other Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	0	0
Mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	111,954,000	116,215,000
Mortgage-backed securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	0	0
Mortgage-backed securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	111,954,000	116,215,000
Mortgage-backed securities [Member] \| Significant Other Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	0	0
Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	911,000	950,000
Other debt securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	0	0
Other debt securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	911,000	950,000
Other debt securities [Member] \| Significant Other Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	0	0
Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	15,584,000	9,003,000
Municipal securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	0	0
Municipal securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	15,584,000	9,003,000
Municipal securities [Member] \| Significant Other Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	$ 0	$ 0

Fair Value Disclosures - Assets and Liabilities Measured on Nonrecurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans	$ 407	$ 769
Foreclosed assets	3,524	3,254
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans	0	0
Foreclosed assets	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans	0	0
Foreclosed assets	0	0
Significant Other Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans	407	769
Foreclosed assets	$ 3,524	$ 3,254

Fair Value Disclosures Fair Value Disclosures - Unobservable Inputs (Details)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	$ 407,000	$ 769,000
Foreclosed assets	3,524,239	3,254,392
Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	$ 407,000	$ 769,000
Weighted Average [Member] \| Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans, measurement input	0.47	0.36
Foreclosed assets, measurement input	0.19	0.18

Fair Value Disclosures - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Assets:
Securities available-for-sale, at fair value	$ 156,577,182	$ 151,944,567
Restricted investments	8,272,600	6,430,700
Liabilities:
Noninterest-bearing demand deposits	301,317,854	220,520,287
Interest-bearing demand deposits	246,942,432	231,643,508
Time deposits	535,879,278	442,774,094
Level 1 [Member]
Assets:
Cash and cash equivalents	170,235,000	113,027,000
Securities available-for-sale, at fair value	0	0
Level 2 [Member]
Assets:
Securities available-for-sale, at fair value	156,577,000	151,944,000
Liabilities:
Noninterest-bearing demand deposits	301,318,000	220,520,000
Interest-bearing demand deposits	246,942,000	231,644,000
Money Market and Savings deposits	632,518,000	543,645,000
Time deposits	537,006,000	443,547,000
Securities sold under agreements to repurchase	18,635,000	24,055,000
Federal Home Loan Bank advances and other borrowings	72,040,000	43,600,000
Level 3 [Member]
Assets:
Securities available-for-sale, at fair value	0	0
Loans, net	1,569,916,000	1,292,303,000
Carrying Amount [Member]
Assets:
Cash and cash equivalents	170,235,000	113,027,000
Securities available-for-sale, at fair value	156,577,000	151,944,000
Restricted investments	8,273,000	6,431,000
Loans, net	1,568,361,000	1,317,398,000
Liabilities:
Noninterest-bearing demand deposits	301,318,000	220,520,000
Interest-bearing demand deposits	246,942,000	231,644,000
Money Market and Savings deposits	632,518,000	543,645,000
Time deposits	535,879,000	442,774,000
Securities sold under agreements to repurchase	18,635,000	24,055,000
Federal Home Loan Bank advances and other borrowings	72,040,000	43,600,000
Estimated Fair Value [Member]
Assets:
Cash and cash equivalents	170,235,000	113,027,000
Securities available-for-sale, at fair value	156,577,000	151,944,000
Loans, net	1,569,916,000	1,292,303,000
Liabilities:
Noninterest-bearing demand deposits	301,318,000	250,520,000
Interest-bearing demand deposits	246,942,000	231,644,000
Money Market and Savings deposits	632,518,000	543,645,000
Time deposits	537,006,000	443,547,000
Securities sold under agreements to repurchase	18,635,000	24,055,000
Federal Home Loan Bank advances and other borrowings	$ 72,040,000	$ 43,600,000

Small Business Lending Fund - Narrative (Details) - USD ($)				3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 06, 2017	Jan. 30, 2017	Feb. 04, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)				0		0				0
Preferred stock, dividend rate (as a percent)			9.00%						1.00%
Preferred stock dividends				$ 0	$ 0	$ 0	$ 195,000	$ 1,022,000	$ 120,000
Proceeds from issuance of common stock						1,079,979	37,591,479
Payments for redemption of preferred stock	$ 12,000,000
Payment of dividends on preferred stock	$ 195,000					$ 0	$ 195,000
SBLF Program [Member]
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)									12,000
Share price (in dollars per share)									$ 1,000
Common Stock [Member]
Class of Stock [Line Items]
Issuance of common stock in public offering (in shares)		2,010,084
Proceeds from issuance of common stock		$ 33,200,000

Related Party Transactions (Details) - Director [Member]	Mar. 01, 2018 director $ / shares shares
Related Party Transaction [Line Items]
Number of shares sold (in shares)	21,250
Number of directors \| director	2
Price per share (in dollars per share) \| $ / shares	$ 21.70
Steven B. Tucker [Member]
Related Party Transaction [Line Items]
Stock purchased (in shares)	6,250
W. Miller Welborn [Member]
Related Party Transaction [Line Items]
Stock purchased (in shares)	15,000

Subsequent Events - Narrative (Details) - USD ($)	6 Months Ended
Subsequent Events - Narrative (Details) - USD ($)	Jun. 30, 2018	Jun. 27, 2018	Jun. 26, 2018	May 01, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Common Stock, Shares, Outstanding	12,704,581				11,152,561
Foothills Bancorp [Member]
Subsequent Event [Line Items]
Cash paid upon conversion (in dollars per share)		$ 1.75
Common shares converted (in shares)		0.666
Common Stock, Shares, Outstanding			1,776,925
Termination fee	$ 1,450,000
Tennessee Bancshares [Member]
Subsequent Event [Line Items]
Common shares converted (in shares)				0.8065