Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid -in Capital	Unearned ESOP Shares	Retained Earnings	Accumulated Other Comprehensive Income, net of tax
Beginning balance (in shares) at Dec. 31, 2018		2,544,059
Beginning balance at Dec. 31, 2018	$ 71,627	$ 25	$ 25,663	$ (340)	$ 46,165	$ 114
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,809				4,809
Other comprehensive income (loss), net of tax	71					71
Share-based compensation	159		159
Restricted stock awards issued (in shares)		15,925
Restricted stock awards issued	0
Cash dividends paid on common stock	(1,075)				(1,075)
Common stock surrendered (in shares)		(3,810)
Common stock surrendered	0
Common stock options exercised (in shares)		11,772
Common stock options exercised	131		131
Allocation of ESOP shares	294		209	85
Ending balance (in shares) at Sep. 30, 2019		2,567,946
Ending balance at Sep. 30, 2019	76,016	$ 25	26,162	(255)	49,899	185
Beginning balance (in shares) at Jun. 30, 2019		2,563,488
Beginning balance at Jun. 30, 2019	74,565	$ 25	25,926	(283)	48,710	187
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,548				1,548
Other comprehensive income (loss), net of tax	(2)					(2)
Share-based compensation	72		72
Cash dividends paid on common stock	(359)				(359)
Common stock surrendered (in shares)		(1,032)
Common stock surrendered	0
Common stock options exercised (in shares)		5,490
Common stock options exercised	93		93
Allocation of ESOP shares	99		71	28
Ending balance (in shares) at Sep. 30, 2019		2,567,946
Ending balance at Sep. 30, 2019	$ 76,016	$ 25	26,162	(255)	49,899	185
Beginning balance (in shares) at Dec. 31, 2019	2,567,389	2,567,389
Beginning balance at Dec. 31, 2019	$ 77,726	$ 25	26,343	(227)	51,410	175
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,443				5,443
Other comprehensive income (loss), net of tax	84					84
Share-based compensation	283		283
Restricted stock awards issued (in shares)		13,600
Restricted stock awards issued	0
Cash dividends paid on common stock	(1,683)				(1,683)
Common stock surrendered (in shares)		(3,423)
Common stock surrendered	0
Restricted shares forfeited (in shares)		(1,690)
Restricted shares forfeited	0
Common stock options exercised (in shares)		19,413
Common stock options exercised	239		239
Allocation of ESOP shares	$ 238		153	85
Ending balance (in shares) at Sep. 30, 2020	2,595,289	2,595,289
Ending balance at Sep. 30, 2020	$ 82,330	$ 25	27,018	(142)	55,170	259
Beginning balance (in shares) at Jun. 30, 2020		2,593,152
Beginning balance at Jun. 30, 2020	80,235	$ 25	26,894	(170)	53,224	262
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,335				2,335
Other comprehensive income (loss), net of tax	(3)					(3)
Share-based compensation	52		52
Cash dividends paid on common stock	(389)				(389)
Common stock surrendered (in shares)		(2,842)
Common stock surrendered	0
Common stock options exercised (in shares)		4,979
Common stock options exercised	23		23
Allocation of ESOP shares	$ 77		49	28
Ending balance (in shares) at Sep. 30, 2020	2,595,289	2,595,289
Ending balance at Sep. 30, 2020	$ 82,330	$ 25	$ 27,018	$ (142)	$ 55,170	$ 259