CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Less: ESOP Owned Shares [Member]	Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative change in accounting principle	$ 0	$ 0	$ (1,279)	$ 0	$ 0	$ 0	$ (1,279)
Balance at Dec. 31, 2018	$ 14,772	80,412	119,834	(2,243)	0	(58,195)	154,580
Balance (in shares) at Dec. 31, 2018	14,771,520
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	4,773	0	0	0	4,773
Other comprehensive income (loss), (net of tax)	0	0	0	2,296	0	0	2,296
Balance at Mar. 31, 2019	$ 14,772	80,412	123,328	53	0	(58,195)	160,370
Balance (in shares) at Mar. 31, 2019	14,771,520
Balance at Dec. 31, 2019	$ 18,036	140,492	146,696	958	0	0	$ 306,182
Balance (in shares) at Dec. 31, 2019	18,036,115						18,036,115
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	7,083	0	0	0	$ 7,083
Cash dividends, common	0	0	(541)	0	0	0	(541)
Other comprehensive income (loss), (net of tax)	0	0	0	13,939	0	0	13,939
Exercise of employee stock options and vesting of restricted stock units, net of 660 shares for cashless exercise and net of 4,986 shares for taxes	$ 20	(103)	0	0	0	0	(83)
Exercise of employee stock options and vesting of restricted stock units, net of 660 shares for cashless exercise and net of 4,986 shares for taxes (in shares)	19,899
Stock-based compensation	$ 0	310	0	0	0	0	310
Balance at Mar. 31, 2020	$ 18,056	$ 140,699	$ 153,238	$ 14,897	$ 0	$ 0	$ 326,890
Balance (in shares) at Mar. 31, 2020	18,056,014						18,056,014