Short-Term Borrowings - Balance, Weighted Average and Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Balance	$ 301,207	$ 488,383	$ 590,161
Weighted Average Interest Rate	1.76%	2.57%	1.38%
Interest Expense	$ 6,526	$ 11,304	$ 7,453
REPOs
Short-term Debt [Line Items]
Balance	$ 19,888	$ 18,383	$ 50,161
Weighted Average Interest Rate	0.74%	0.46%	0.39%
Interest Expense	$ 110	$ 222	$ 54
FHLB advances
Short-term Debt [Line Items]
Balance	$ 281,319	$ 470,000	$ 540,000
Weighted Average Interest Rate	1.84%	2.65%	1.47%
Interest Expense	$ 6,416	$ 11,082	$ 7,399