Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Unearned ESOP Shares	Retained Earnings	Accumulated Other Comprehensive Loss	Total
Balance at Dec. 31, 2018	$ 97	$ 65,090	$ (4,893)	$ 182,594	$ (7,809)	$ 235,079
Balance (in shares) at Dec. 31, 2018	9,645,955
Increase (Decrease) in Stockholders' Equity
Net income				6,524		6,524
Other comprehensive income (loss)					490	490
Adoption of lease accounting standard				(10)		(10)
Cash dividends declared				(2,024)		(2,024)
Share-based compensation		86				86
Share-based compensation (in shares)	3,340
Allocation of ESOP shares		211	122			333
Repurchase shares of common stock	$ (1)	(2,933)				(2,934)
Repurchase shares of common stock (in shares)	(107,660)
Exercise of options for common stock		1,294				1,294
Exercise of options for common stock (in shares)	74,560
Balance at Mar. 31, 2019	$ 96	63,748	(4,771)	187,084	(7,319)	238,838
Balance (in shares) at Mar. 31, 2019	9,616,195
Balance at Dec. 31, 2019	$ 97	65,057	(4,404)	190,808	(7,668)	243,890
Balance (in shares) at Dec. 31, 2019	9,681,493
Increase (Decrease) in Stockholders' Equity
Net income				4,473		4,473
Other comprehensive income (loss)					(102)	(102)
Cash dividends declared				(2,121)		(2,121)
Share-based compensation		157				157
Share-based compensation (in shares)	15,671
Allocation of ESOP shares		217	122			339
Repurchase shares of common stock	$ (1)	(3,107)				(3,108)
Repurchase shares of common stock (in shares)	(126,379)
Exercise of options for common stock		391				391
Exercise of options for common stock (in shares)	22,547
Balance at Mar. 31, 2020	$ 96	$ 62,715	$ (4,282)	$ 193,160	$ (7,770)	$ 243,919
Balance (in shares) at Mar. 31, 2020	9,593,332