Derivative Financial Instruments Derivative Financial Instruments (Details 3) $ in Thousands	Mar. 31, 2020 USD ($) instrument	Dec. 31, 2019 USD ($) instrument
Derivative [Line Items]
Cash collateral pledged for derivatives	$ 151,300	$ 56,600
Risk participation agreement - participant bank
Derivative [Line Items]
Instruments held | instrument	10	12
Maximum exposure	$ 7,000	$ 3,600
Notional amount	$ 136,500	$ 146,700
Risk participation agreement - lead bank
Derivative [Line Items]
Instruments held | instrument	8	12
Notional amount	$ 80,800	$ 145,900
Non-hedging | Commercial loan/lease
Derivative [Line Items]
Credit risk exposure, net of collateral pledged, relating to derivatives	$ 125,900	$ 48,700
Non-hedging | Interest rate cap | Commercial loan/lease
Derivative [Line Items]
Weighted average fixed interest rate	3.31%	3.29%
Interest-bearing deposits
Derivative [Line Items]
Cash collateral pledged for derivatives	$ 125,400	$ 54,300
Other assets
Derivative [Line Items]
Cash collateral pledged for derivatives	$ 25,900	$ 2,300