Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) - Not Designated as Hedging Instrument $ in Thousands		Jun. 30, 2020 USD ($) position	Dec. 31, 2019 USD ($) position
Receive fixed, pay variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	324	299
Less than 1 year		$ 140,331	$ 156,690
Less than 2 years		71,765	125,203
Less than 3 years		123,243	85,603
Less than 4 years		139,981	165,599
Thereafter		1,231,251	1,044,315
Derivative, Notional Amount		1,706,571	1,577,410
Fair Value	[2]	$ 153,344	$ 48,596
Pay fixed, receive variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	316	290
Less than 1 year		$ 143,646	$ 156,690
Less than 2 years		71,765	125,203
Less than 3 years		123,243	85,603
Less than 4 years		139,981	165,599
Thereafter		1,231,251	1,044,315
Derivative, Notional Amount		1,709,886	1,577,410
Fair Value	[2]	$ (153,348)	$ (48,591)
Buys foreign currency, sells U.S. currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	37	40
Less than 1 year		$ 108,120	$ 91,434
Derivative, Notional Amount		108,120	91,434
Fair Value	[2]	$ 1,007	$ (81)
Buys U.S. currency, sells foreign currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	37	40
Less than 1 year		$ 108,120	$ 91,434
Derivative, Notional Amount		108,120	91,434
Fair Value	[2]	$ (963)	$ 123

[1] The Company may enter into one dealer swap agreement which offsets multiple commercial borrower swap agreements.

[2] Beginning in 2020, the Company made an election to include accrued interest within fair value balances.