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Derivatives (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
contracts
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
contracts
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
contracts
Derivative Instruments and Hedging Activities Disclosure [Abstract]          
Counterparty default losses on forward contracts $ 0 $ 0 $ 0 $ 0  
Credit Derivatives [Line Items]          
Commitments    
Collateralized financings 7,700   7,700    
Termination value of derivatives in a net liability position 313,900   313,900   270,000
Collateral required to be posted under agreements 101,300   101,300   89,500
Variation Margin Adjustment $ 214,300   $ 214,300   $ 209,500
Customer swaps offset by a swap executed on a bilateral basis with a counterparty bank 210   210   71
Counterparty bank cash as collateral on bilateral positions $ 96,600   $ 96,600   $ 51,900
Interest rate futures          
Credit Derivatives [Line Items]          
Derivative, notional amount 218,000   218,000    
Mortgage-Backed Security          
Credit Derivatives [Line Items]          
Derivative, notional amount 10,000   10,000    
Interest rate swaps          
Credit Derivatives [Line Items]          
Derivative, notional amount $ 8,900,000   $ 8,900,000   $ 7,300,000
Number of interest rate swaps | contracts 1,325   1,325   922
Commitments To Originate Loans Held For Sale          
Credit Derivatives [Line Items]          
Commitments $ 44,305   $ 44,305   $ 56,100
Interest rate forward sales commitments          
Credit Derivatives [Line Items]          
Commitments $ 81,100   $ 81,100   $ 104,000