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, 2017	$ 99	$ 73,050	$ (5,383)	$ 172,782	$ (5,694)	$ 234,854
Balance (in shares) at Dec. 31, 2017	9,915,058
Increase (Decrease) in Stockholders' Equity
Net income				19,212		19,212
Other comprehensive income (loss)					(980)	(980)
Reclassification of deferred taxes				1,135	(1,135)
Cash dividends declared				(10,535)		(10,535)
Share-based compensation		341				341
Share-based compensation (in shares)	4,401
Allocation of 48,932 ESOP shares		966	490			1,456
Repurchase of shares of common stock	$ (3)	(10,549)				(10,552)
Repurchase of shares of common stock (in shares)	(347,393)
Exercise of options for common stock	$ 1	1,282				1,283
Exercise of options for common stock (in shares)	73,889
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				21,995		21,995
Other comprehensive income (loss)					141	141
Adoption of lease accounting standard				(10)		(10)
Cash dividends declared				(13,771)		(13,771)
Share-based compensation		571				571
Share-based compensation (in shares)	6,541
Allocation of 48,932 ESOP shares		909	489			1,398
Repurchase of shares of common stock	$ (2)	(5,384)				(5,386)
Repurchase of shares of common stock (in shares)	(192,248)
Exercise of options for common stock	$ 2	3,871				3,873
Exercise of options for common stock (in shares)	221,245
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