Derivative Financial Instruments (Summary of Interest Rate Derivatives) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Derivative Assets
Derivative Assets	$ 313,480	$ 165,008	$ 191,612
Derivative Liabilities
Gross Amounts Recognized	357,170	123,000	161,314
Interest rate derivatives
Derivative Assets
Derivative Assets	299,298	152,493	169,315
Less: Amounts offset in the Statements of Condition	0	0	0
Net amount presented in the Statements of Condition	299,298	152,493	169,315
Offsetting Derivative Positions	(74,101)	(52,832)	(42,645)
Collateral Posted	(204,260)	(3,530)	0
Net Credit Exposure	20,937	96,131	126,670
Derivative Liabilities
Gross Amounts Recognized	353,426	119,907	157,578
Less: Amounts offset in the Statements of Condition	0	0	0
Net amount presented in the Statements of Condition	353,426	119,907	157,578
Offsetting Derivative Positions	(74,101)	(52,832)	(42,645)
Collateral Posted	0	(55,201)	(110,440)
Net Credit Exposure	$ 279,325	$ 11,874	$ 4,493