Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) - Not Designated as Hedging Instrument $ in Thousands		Sep. 30, 2021 USD ($) position	Dec. 31, 2020 USD ($) position
Receive fixed, pay variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	293	322
Less than 1 year		$ 30,047	$ 102,999
Less than 2 years		148,874	76,487
Less than 3 years		129,939	149,265
Less than 4 years		288,580	147,422
Thereafter		980,166	1,222,557
Derivative, Notional Amount		1,577,606	1,698,730
Fair Value		$ 67,126	$ 127,226
Pay fixed, receive variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	293	313
Less than 1 year		$ 30,047	$ 102,999
Less than 2 years		148,874	76,487
Less than 3 years		129,939	149,265
Less than 4 years		288,580	147,422
Thereafter		980,166	1,222,557
Derivative, Notional Amount		1,577,606	1,698,730
Fair Value		$ (67,122)	$ (127,216)
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]	45	33
Less than 1 year		$ 148,253	$ 87,557
Less than 2 years		6,087	5,300
Less than 3 years		0	0
Less than 4 years		0	0
Thereafter		0	0
Derivative, Notional Amount		154,340	92,857
Fair Value		$ (5,529)	$ (4,214)
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]	45	33
Less than 1 year		$ 148,253	$ 87,557
Less than 2 years		6,087	5,300
Less than 3 years		0	0
Less than 4 years		0	0
Thereafter		0	0
Derivative, Notional Amount		154,340	92,857
Fair Value		$ 5,530	$ 4,224
Risk Participated Out | Risk Participation Agreement
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position		11	12
Less than 1 year			$ 6,721
Less than 2 years		$ 2,645	0
Less than 3 years			2,675
Less than 4 years		31,719	7,307
Thereafter		67,767	93,378
Derivative, Notional Amount		102,131	110,081
Fair Value		$ 236	$ 512
Risk Participated In | Risk Participation Agreement
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position		7	8
Less than 1 year		$ 18,450	$ 0
Less than 2 years		23,375	30,649
Less than 3 years		16,768	29,072
Less than 4 years			0
Thereafter		8,372	15,844
Derivative, Notional Amount		66,965	75,565
Fair Value		$ (64)	$ (118)

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