Statement of Changes in Stockholders' Equity - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock	Paid-In Capital	Retained Earnings	Unallocated Common Stock Held by ESOP	Accumulated Other Comprehensive Loss
Balance- December 31, 2016 at Dec. 31, 2016	$ 73,185	$ 57	$ 51,809	$ 23,370	$ (1,929)	$ (122)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	2,450			2,450
Other comprehensive income, net of tax	91					91
Allocation of ESOP stock	175		55		120
Exercise of stock option (273,081 shares)	2,578	3	2,575
Stock-based compensation	299		299
Cash paid for common stock dividend	(2,451)			(2,451)
Repurchased Stock (218,627 shares)	(3,787)	(2)	(3,785)
Balance - September 30, 2017 at Sep. 30, 2017	$ 72,540	$ 58	$ 50,953	$ 23,369	$ (1,809)	$ (31)