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]
Issuance of common stock, net	$ 3,207	48,185	0	0	0	0	51,392
Issuance of common stock, net (in shares)	3,207,000
Net income	$ 0	0	19,111	0	0	0	19,111
Cash dividends, common	0	0	(539)	0	0	0	(539)
Other comprehensive income (loss), (net of tax)	0	0	0	5,871	0	0	5,871
Exercise of employee stock options and vesting of restricted stock units	$ 25	25	0	0	0	0	(161)
Exercise of employee stock options and vesting of restricted stock units (in shares)	25,803
Terminated ESOP put option	$ 0	0	0	0	0	58,195	58,195
Stock-based compensation	0	407	0	0	0	0	407
Share-based liability awards modified to equity awards	0	11,450	0	0	0	0	11,450
Balance at Sep. 30, 2019	$ 18,004	140,268	137,127	3,628	0	0	299,027
Balance (in shares) at Sep. 30, 2019	18,004,323
Balance at Jun. 30, 2019	$ 17,979	140,189	129,408	3,537	0	0	291,113
Balance (in shares) at Jun. 30, 2019	17,978,520
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net	$ 0	0	0	0	0	0	0
Issuance of common stock, net (in shares)	0
Net income	$ 0	0	8,258	0	0	0	8,258
Cash dividends, common	0	0	(539)	0	0	0	(539)
Other comprehensive income (loss), (net of tax)	0	0	0	91	0	0	91
Exercise of employee stock options and vesting of restricted stock units	$ 25	(186)	0	0	0	0	(161)
Exercise of employee stock options and vesting of restricted stock units (in shares)	25,803
Stock-based compensation	$ 0	265	0	0	0	0	265
Share-based liability awards modified to equity awards	0	0	0	0	0	0	0
Balance at Sep. 30, 2019	$ 18,004	140,268	137,127	3,628	0	0	299,027
Balance (in shares) at Sep. 30, 2019	18,004,323
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	29,429	0	0	0	$ 29,429
Cash dividends, common	0	0	(1,624)	0	0	0	(1,624)
Other comprehensive income (loss), (net of tax)	0	0	0	17,805	0	0	17,805
Exercise of employee stock options and vesting of restricted stock units	$ 28	(157)	0	0	0	0	(129)
Exercise of employee stock options and vesting of restricted stock units (in shares)	27,759
Purchase of treasury stock	$ 0	0	0	0	(61)	0	(61)
Extinguish treasury stock	(5)	(56)	0	0	61	0	$ 0
Extinguish treasury stock (in shares)							(4,700)
Stock-based compensation	0	966	0	0	0	0	$ 966
Balance at Sep. 30, 2020	$ 18,059	141,245	174,501	18,763	0	0	$ 352,568
Balance (in shares) at Sep. 30, 2020	18,059,174						18,059,174
Balance at Jun. 30, 2020	$ 18,059	140,620	158,311	19,544	0	0	$ 336,534
Balance (in shares) at Jun. 30, 2020	18,059,174
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	16,731	0	0	0	16,731
Cash dividends, common	0	0	(541)	0	0	0	(541)
Other comprehensive income (loss), (net of tax)	0	0	0	(781)	0	0	(781)
Stock-based compensation	0	625	0	0	0	0	625
Balance at Sep. 30, 2020	$ 18,059	$ 141,245	$ 174,501	$ 18,763	$ 0	$ 0	$ 352,568
Balance (in shares) at Sep. 30, 2020	18,059,174						18,059,174