Short-Term Borrowings and Long-Term FHLB Advances - Rate and Maturity Information on Federal Home Loan Bank Advances and Other Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank, Advances [Line Items]
Other long-term debt	$ 55,400	$ 55,400
Bullet maturity – fixed rate | Fixed Rate
Federal Home Loan Bank, Advances [Line Items]
Other long-term debt	$ 55,407	$ 55,374
Bullet maturity – fixed rate | Fixed Rate | Weighted average rate
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, advances, interest rate at period end	1.76%
Bullet maturity – fixed rate | Fixed Rate | Minimum
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, advances, interest rate at period end	1.40%
Bullet maturity – fixed rate | Fixed Rate | Maximum
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, advances, interest rate at period end	2.13%