Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-In Capital	Retained Earnings	Unallocated Common Stock Heldby ESOP
Beginning balance at Dec. 31, 2017	$ 73,025	$ 58	$ 51,068	$ 23,641	$ (1,742)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,835			4,835
Allocation of ESOP stock	329		219		110
Repurchased stock	(7,030)	(4)	(7,026)
Exercise of stock options	137		137
Stock-based compensation	328		328
Cash paid for common stock dividend	(4,978)			(4,978)
Ending balance at Dec. 31, 2018	66,646	54	44,726	23,498	(1,632)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,103			4,103
Allocation of ESOP stock	260		151		109
Repurchased stock	(3,349)	(2)	(3,347)
Stock-based compensation	327		327
Cash paid for common stock dividend	(2,612)			(2,612)
Ending balance at Dec. 31, 2019	$ 65,375	$ 52	$ 41,857	$ 24,989	$ (1,523)