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)	[1]	$ 54,977
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				616			616
Other comprehensive income					(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)	[1]	54,977
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income							3,159
Other comprehensive income					(1,123)	[1]	(1,123)
Balance at Sep. 30, 2018		100		64,991	(8,078)	[1]	57,013
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					463		463
Balance at Jun. 30, 2018		100		63,027	(7,566)	[1]	55,561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				1,964			1,964
Other comprehensive income					(512)	[1]	(512)
Balance at Sep. 30, 2018		100		64,991	(8,078)	[1]	57,013
Balance at Dec. 31, 2018		100		66,189	(7,012)	[1]	59,277
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				911			911
Other comprehensive income					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)
ESOP shares committed to be allocated		9	55				64
Balance at Mar. 31, 2019	111	45,863	(4,309)	67,100	(5,916)		102,849
Balance at Dec. 31, 2018		100		66,189	(7,012)	[1]	59,277
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income							4,223
Other comprehensive income					3,079	[1]	3,079
Balance at Sep. 30, 2019	111	45,865	(4,200)	70,412	(3,933)	[1]	108,255
Balance at Mar. 31, 2019	111	45,863	(4,309)	67,100	(5,916)		102,849
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				1,221			1,221
Other comprehensive income					1,561		1,561
Common Stock and proceeds of offering		(10)					(10)
ESOP shares committed to be allocated		8	54				62
Balance at Jun. 30, 2019	111	45,861	(4,255)	68,321	(4,355)	[1]	105,683
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				2,091			2,091
Other comprehensive income					422	[1]	422
ESOP shares committed to be allocated		4	55				59
Balance at Sep. 30, 2019	$ 111	$ 45,865	$ (4,200)	$ 70,412	$ (3,933)	[1]	$ 108,255

[1] All amounts are net of tax. Related income tax expense or benefit is calculated using an income tax rate of 21.0%.