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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Earnings (Loss) Per Share, Basic and Diluted [Abstract]
Net income (loss) available to common stockholders	$ 7,416	$ 3,737	$ 4,630	$ 3,559	$ 991	$ 3,560	$ 2,572	$ 1,881	$ 19,342	$ 9,004
Average common shares outstanding (shares)									17,434,780	18,429,018
Less:
Unearned ESOP shares (shares)									0	(148,179)
Unvested restricted stock shares (shares)									(435)	(940)
Weighted average common shares outstanding (shares)									17,434,345	18,279,899
Add - Net effect of dilutive stock options and unvested restricted stock									0	437
Weighted average diluted common shares outstanding (shares)									17,434,345	18,280,336
Basic earnings (loss) per common share (usd per share)	$ 0.44	$ 0.22	$ 0.26	$ 0.20		$ 0.20	$ 0.14	$ 0.10	$ 1.11	$ 0.49
Diluted earnings (loss) per common share (usd per share)		$ 0.22	$ 0.26	$ 0.20	$ 0.06	$ 0.20	$ 0.14	$ 0.10	$ 1.11	$ 0.49

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