Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Unallocated common stock held by the ESOP	Retained Earnings	Accumulated Other Comprehensive Loss	Total
Balance at Dec. 31, 2017		$ 100		$ 61,832	$ (6,955)	$ 54,977
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				616		616
Other comprehensive income (loss)					(1,074)	(1,074)
Balance at Mar. 31, 2018		100		62,448	(8,029)	54,519
Balance at Dec. 31, 2017		100		61,832	(6,955)	54,977
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income						1,195
Other comprehensive income (loss)						(611)
Balance at Jun. 30, 2018		100		63,027	(7,566)	55,561
Balance at Mar. 31, 2018		100		62,448	(8,029)	54,519
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				579		579
Other comprehensive income (loss)					463	463
Balance at Jun. 30, 2018		100		63,027	(7,566)	55,561
Balance at Dec. 31, 2018		100		66,189	(7,012)	59,277
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				911		911
Other comprehensive income (loss)					1,096	1,096
Common Stock and proceeds of offering	111	45,754				45,865
Unallocated common stock held by ESOP			(4,364)			(4,364)
Balance at Mar. 31, 2019	111	45,854	(4,364)	67,100	(5,916)	102,785
Balance at Dec. 31, 2018		100		66,189	(7,012)	59,277
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income						2,132
Other comprehensive income (loss)						2,657
Balance at Jun. 30, 2019	111	45,844	(4,364)	68,321	(4,355)	105,557
Balance at Mar. 31, 2019	111	45,854	(4,364)	67,100	(5,916)	102,785
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				1,221		1,221
Other comprehensive income (loss)					1,561	1,561
Common Stock and proceeds of offering		(10)				(10)
Balance at Jun. 30, 2019	$ 111	$ 45,844	$ (4,364)	$ 68,321	$ (4,355)	$ 105,557