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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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