Derivative Financial Instruments (Summary of Interest Rate Derivatives) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Derivative Assets
Derivative Assets	$ 183,925	$ 165,008	$ 212,380
Derivative Liabilities
Gross Amounts Recognized	167,857	123,000	193,439
Interest rate derivatives
Derivative Assets
Derivative Assets	175,756	152,493	188,331
Less: Amounts offset in the Statements of Condition	0	0	0
Net amount presented in the Statements of Condition	175,756	152,493	188,331
Offsetting Derivative Positions	(6,009)	(52,832)	(37,895)
Collateral Posted	(163,412)	(3,530)	0
Net Credit Exposure	6,335	96,131	150,436
Derivative Liabilities
Gross Amounts Recognized	165,107	119,907	187,359
Less: Amounts offset in the Statements of Condition	0	0	0
Net amount presented in the Statements of Condition	165,107	119,907	187,359
Offsetting Derivative Positions	(6,009)	(52,832)	(37,895)
Collateral Posted	(91)	(55,201)	(146,240)
Net Credit Exposure	$ 159,007	$ 11,874	$ 3,224