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Short-Term Borrowings - Balance, Weighted Average and Interest Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Short-term Debt [Line Items]      
Balance $ 590,161 $ 710,832 $ 418,086
Weighted Average Interest Rate 1.38% 0.70% 0.44%
Interest Expense $ 7,453 $ 2,718 $ 936
REPOs      
Short-term Debt [Line Items]      
Balance $ 50,161 $ 50,832 $ 62,086
Weighted Average Interest Rate 0.39% 0.01% 0.01%
Interest Expense $ 54 $ 5 $ 4
FHLB advances      
Short-term Debt [Line Items]      
Balance $ 540,000 $ 660,000 $ 356,000
Weighted Average Interest Rate 1.47% 0.76% 0.52%
Interest Expense $ 7,399 $ 2,713 $ 932