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Derivatives (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]          
Counterparty default losses on forward contracts $ 0 $ 0 $ 0 $ 0  
Credit Derivatives [Line Items]          
Commitments    
Collateral required to be posted under agreements 95,400   95,400   88,300
Variation Margin Adjustment 120,600   120,600   166,300
Interest rate futures          
Credit Derivatives [Line Items]          
Derivative, notional amount 166,000   166,000   150,000
Mortgage-Backed Security          
Credit Derivatives [Line Items]          
Derivative, notional amount 28,000   28,000   36,000
Interest rate swaps          
Credit Derivatives [Line Items]          
Derivative Asset, Notional Amount 4,400,000   4,400,000   4,700,000
Derivative Liability, Notional Amount 4,500,000   4,500,000   4,700,000
Commitments To Originate Loans Held For Sale          
Credit Derivatives [Line Items]          
Commitments 60,395   60,395   20,600
Interest rate forward sales commitments          
Credit Derivatives [Line Items]          
Commitments $ 90,597   $ 90,597   $ 39,500