Borrowings - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Debt Disclosure [Abstract]
Advance from the Federal Home Loan Bank	$ 8,000		$ 8,000		$ 3,000
Guarantee from the FHLB through a standby letter of credit	$ 6,792		$ 6,792		$ 2,487
Floating interest rate on the overnight advances from the FHLB	1.28%		1.28%		0.78%
Interest expense on FHLB advances	$ 32	$ 0	$ 61	$ 6
Collateral mortgage loans available to secure advances from the FHLB	174,480		174,480		$ 164,843
Bank's ability to borrow under repurchase agreements	25,000		25,000		25,000
Securities sold under repurchase agreements	0		0		$ 0
Interest expense on securities sold under repurchase agreements	$ 0	$ 0	$ 0	$ 0