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Business Combinations (Textual) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2018 | Oct. 31, 2018 | May 01, 2018 | Apr. 27, 2018 | Nov. 01, 2017 | May 19, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 15, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  | 13,933,504 | 11,152,561 |
Goodwill |  |  |  |  |  |  | $ 66,100 |  |
Foothills Bancorp [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares issued upon conversion (in shares) | 0.666 |  |  |  |  |  |  |  |
Cash paid upon conversion (in dollars per share) | $ 1.75 |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 1,183,232 |  |  |  |  |  |  |  |
Cash paid for merger | $ 3,100 |  |  |  |  |  |  |  |
Additional consideration transferred | $ 3,000 |  |  |  |  |  |  |  |
Consecutive trading days |  | 10 days |  |  |  |  |  |  |
Share price (in dollars per share) | $ 20.34 |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 91.00% |  |  |  |  |  |  |  |
Goodwill | $ 7,476 |  |  |  |  |  |  |  |
Pro forma, revenue of acquiree since acquisition date, actual |  |  |  |  |  |  | 1,500 |  |
Pro forma information, earnings (loss) since acquisition date, actual |  |  |  |  |  |  | 876 |  |
Pro forma revenue |  |  |  |  |  |  | 11,000 |  |
Pro forma net income (loss) |  |  |  |  |  |  | 1,600 |  |
Cash consideration paid | $ 6,069 |  |  |  |  |  |  |  |
Tennessee Bancshares [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares issued upon conversion (in shares) |  |  | 0.8065 |  |  |  |  |  |
Number of shares issued (in shares) |  |  | 1,458,981 |  |  |  |  |  |
Consecutive trading days |  |  |  | 10 days |  |  |  |  |
Share price (in dollars per share) |  |  | $ 23.85 |  |  |  |  |  |
Ownership interest (as a percent) |  |  | 89.00% |  |  |  |  |  |
Goodwill |  |  | $ 15,779 |  |  |  |  |  |
Pro forma, revenue of acquiree since acquisition date, actual |  |  |  |  |  |  | 8,400 |  |
Pro forma information, earnings (loss) since acquisition date, actual |  |  |  |  |  |  | 3,500 |  |
Pro forma revenue |  |  |  |  |  |  | 14,700 |  |
Pro forma net income (loss) |  |  |  |  |  |  | 3,600 |  |
Cash consideration paid |  |  | $ 5 |  |  |  |  |  |
Fair value adjustment |  |  |  |  |  |  | 51 |  |
Capstone Bancshares Inc. [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Share price (in dollars per share) |  |  |  |  | $ 23.49 |  |  |  |
Ownership interest (as a percent) |  |  |  |  | 74.00% |  |  |  |
Goodwill |  |  |  |  | $ 38,058 |  |  |  |
Pro forma, revenue of acquiree since acquisition date, actual |  |  |  |  |  |  | 27,800 | $ 5,000 |
Pro forma information, earnings (loss) since acquisition date, actual |  |  |  |  |  |  | 13,500 | 186 |
Pro forma revenue |  |  |  |  |  |  |  | 24,900 |
Pro forma net income (loss) |  |  |  |  |  |  |  | 947 |
Exchange of shares (in 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% |  |  |  |
Goodwill adjustment |  |  |  |  |  |  | 11 |  |
Cash consideration paid |  |  |  |  | $ 15,826 |  |  |  |
Atlantic Capital Bank, N.A. [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 660 |  |  |
Pro forma, revenue of acquiree since acquisition date, actual |  |  |  |  |  |  | 1,600 | 903 |
Pro forma information, earnings (loss) since acquisition date, actual |  |  |  |  |  |  | 546 | $ 63 |
Cash consideration paid |  |  |  |  |  | $ 1,183 |  |  |
Pro Forma [Member] | Foothills Bancorp [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  | 2,300 |  |
Pro Forma [Member] | Tennessee Bancshares [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  | 2,000 |  |
Pro Forma [Member] | Capstone Bancshares Inc. [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  | $ 4,600 |  |
Weighted Average [Member] | Foothills Bancorp [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Share price (in dollars per share) |  | $ 22.46 |  |  |  |  |  |  |
Weighted Average [Member] | Tennessee Bancshares [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Share price (in dollars per share) |  |  |  | $ 23.92 |  |  |  |  |
Subsequent Event [Member] | Entegra Financial Corp [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares issued upon conversion (in shares) |  |  |  |  |  |  |  |  | 1.215
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  | 6,917,703

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