Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) - Not Designated as Hedging Instrument $ in Thousands		Jun. 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]	295	322
Less than 1 year		$ 53,462	$ 102,999
Less than 2 years		119,443	76,487
Less than 3 years		139,057	149,265
Less than 4 years		211,198	147,422
Thereafter		1,083,785	1,222,557
Derivative, Notional Amount		1,606,945	1,698,730
Fair Value		$ 78,200	$ 127,226
Pay fixed, receive variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions | position	[1]	295	313
Less than 1 year		$ 53,462	$ 102,999
Less than 2 years		119,443	76,487
Less than 3 years		139,057	149,265
Less than 4 years		211,198	147,422
Thereafter		1,083,785	1,222,557
Derivative, Notional Amount		1,606,945	1,698,730
Fair Value		$ (78,200)	$ (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]	43	33
Less than 1 year		$ 132,804	$ 87,557
Less than 2 years			5,300
Less than 3 years		0	0
Less than 4 years		0	0
Thereafter		0	0
Derivative, Notional Amount		132,804	92,857
Fair Value		$ (2,269)	$ (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]	43	33
Less than 1 year		$ 132,804	$ 87,557
Less than 2 years			5,300
Less than 3 years		0	0
Less than 4 years		0	0
Thereafter		0	0
Derivative, Notional Amount		132,804	92,857
Fair Value		$ 2,273	$ 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		$ 0	0
Less than 3 years		2,655	2,675
Less than 4 years		31,761	7,307
Thereafter		67,927	93,378
Derivative, Notional Amount		102,343	110,081
Fair Value		$ 275	$ 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		42,099	30,649
Less than 3 years		16,875	29,072
Less than 4 years			0
Thereafter		8,404	15,844
Derivative, Notional Amount		67,378	75,565
Fair Value		$ (76)	$ (118)

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