Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) - Not Designated as Hedging Instrument $ in Thousands		Mar. 31, 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]	302	322
Less than 1 year		$ 72,391	$ 102,999
Less than 2 years		105,368	76,487
Less than 3 years		137,041	149,265
Less than 4 years		177,153	147,422
Thereafter		1,149,151	1,222,557
Derivative, Notional Amount		1,641,104	1,698,730
Fair Value		$ 66,621	$ 127,226
Pay fixed, receive variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	302	313
Less than 1 year		$ 72,391	$ 102,999
Less than 2 years		105,368	76,487
Less than 3 years		137,041	149,265
Less than 4 years		177,153	147,422
Thereafter		1,149,151	1,222,557
Derivative, Notional Amount		1,641,104	1,698,730
Fair Value		$ (66,615)	$ (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]	30	33
Less than 1 year		$ 94,917	$ 87,557
Less than 2 years		6,538	5,300
Less than 3 years		0	0
Less than 4 years		0	0
Thereafter		0	0
Derivative, Notional Amount		101,455	92,857
Fair Value		$ 2,502	$ (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]	30	33
Less than 1 year		$ 94,917	$ 87,557
Less than 2 years		6,538	5,300
Less than 3 years		0	0
Less than 4 years		0	0
Thereafter		0	0
Derivative, Notional Amount		101,455	92,857
Fair Value		$ (2,493)	$ 4,224
Risk Participated Out | Risk Participation Agreement
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position		12	12
Less than 1 year		$ 6,642	$ 6,721
Less than 2 years		0	0
Less than 3 years		2,665	2,675
Less than 4 years		31,804	7,307
Thereafter		68,040	93,378
Derivative, Notional Amount		109,151	110,081
Fair Value		$ 195	$ 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		$ 0	$ 0
Less than 2 years		30,483	30,649
Less than 3 years		28,866	29,072
Less than 4 years			0
Thereafter		8,436	15,844
Derivative, Notional Amount		67,785	75,565
Fair Value		$ (73)	$ (118)

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