Borrowings - Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Long-term debt
Notes payable, FHLB, ranging in original maturity from nineteen months to ten years, collateralized by FHLB deposits, residential and commercial real estate loans and FHLB stock.	$ 36,976	$ 50,000
Notes Payable	52,500
Total long-term borrowings	$ 89,476	$ 50,000
FHLB advances
Long-term debt
Weighted average rate (as a percent)	2.36%	2.28%
FHLB advances | Minimum
Long-term debt
Interest rate (as a percent)	1.64%	2.20%
FHLB advances | Maximum
Long-term debt
Interest rate (as a percent)	3.04%	2.41%