CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Unearned ESOP Shares [Member]	Treasury Stock [Member]	Less: ESOP Owned Shares [Member]	Total
Balance at Dec. 31, 2017	$ 15,154	$ 85,888	$ 120,589	$ (446)	$ 0	$ (5,858)	$ (57,121)	$ 158,206
Balance (in shares) at Dec. 31, 2017	15,153,510
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	29,290	0	0	0	0	29,290
Cash dividends, common	0	0	(30,045)	0	0	0	0	(30,045)
Other comprehensive income (loss), (net of tax)	0	0	0	(1,797)	0	0	0	(1,797)
Net change in value of ESOP shares	0	0	0	0	0	0	(1,074)	(1,074)
Extinguish treasury stock	$ (382)	(5,476)	0	0	0	5,858	0	0
Extinguish treasury stock (in shares)	(381,990)
Balance at Dec. 31, 2018	$ 14,772	80,412	119,834	(2,243)	0	0	(58,195)	154,580
Balance (in shares) at Dec. 31, 2018	14,771,520
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative change in accounting principle	$ 0	0	(1,279)	0	0	0	0	(1,279)
Issuance of common stock, net	$ 3,207	48,185	0	0	0	0	0	51,392
Issuance of common stock, net (in shares)	3,207,000
Net income	$ 0	0	29,220	0	0	0	0	29,220
Cash dividends, common	0	0	(1,079)	0	0	0	0	(1,079)
Other comprehensive income (loss), (net of tax)	0	0	0	3,201	0	0	0	3,201
Terminated ESOP put option	0	0	0	0	0	0	58,195	58,195
Exercise of employee stock options, net of 111,011 shares for cashless exercise and net of 18,894 shares for taxes	$ 57	(408)	0	0	0	0	0	(351)
Exercise of employee stock options, net of 111,011 shares for cashless exercise and net of 18,894 shares for taxes (in shares)	57,595
Stock-based compensation	$ 0	853	0	0	0	0	0	853
Share-based liability awards modified to equity awards	0	11,450	0	0	0	0	0	11,450
Balance at Dec. 31, 2019	$ 18,036	$ 140,492	$ 146,696	$ 958	$ 0	$ 0	$ 0	$ 306,182
Balance (in shares) at Dec. 31, 2019	18,036,115