Derivatives (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) contracts	Dec. 31, 2022 USD ($) contracts	Dec. 31, 2021 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Counterparty default losses on forward contracts	$ 0	$ 0	$ 0
Collateralized Financings	815	3,800
Credit Derivatives [Line Items]
Commitments and contingent liabilities
Termination value of derivatives in net liability position	260,100	270,000
Required collateral posting	88,300	89,500
Variation Margin Payment	$ 166,300	$ 209,500
Customer swaps offset by a swap executed on a bilateral basis with a counterparty bank	252	71
Counterparty bank cash as collateral on bilateral positions	$ 61,600	$ 51,900
Interest Rate Futures Contracts
Credit Derivatives [Line Items]
Notional amount of credit risk derivatives	150,000	152,000
Mortgage-Backed Security
Credit Derivatives [Line Items]
Notional amount of credit risk derivatives	36,000	10,000
Interest rate swaps
Credit Derivatives [Line Items]
Notional amount of credit risk derivatives	$ 9,100,000	$ 7,300,000
Number of interest rate derivatives held | contracts	1,292	922
Commitments To Originate Loans Held For Sale
Credit Derivatives [Line Items]
Commitments and contingent liabilities	$ 20,588	$ 56,100
Forward Sales Commitments
Credit Derivatives [Line Items]
Commitments and contingent liabilities	$ 39,500	$ 104,000