Short-Term Borrowings - Schedule of Short-Term Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Total short-term borrowings	$ 387,706	$ 89,814
Securities sold under agreements to repurchase
Short-term Debt [Line Items]
Total short-term borrowings	7,706	6,814
Federal Home Loan Bank short-term advances
Short-term Debt [Line Items]
Total short-term borrowings	$ 380,000	$ 83,000