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Derivatives (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
contracts
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
contracts
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
contracts
Derivative Instruments and Hedging Activities Disclosure [Abstract]          
Counterparty default losses on forward contracts $ 0 $ 0 $ 0 $ 0  
Credit Derivatives [Line Items]          
Commitments    
Termination value of derivatives in a net liability position 137,900   137,900   8,700
Collateral required to be posted under agreements 84,900   84,900   92,600
Variation Margin Adjustment $ 119,400   $ 119,400   $ (172,900)
Interest rate swaps          
Credit Derivatives [Line Items]          
Number of interest rate swaps | contracts 944   944   936
Derivative, Notional Amount $ 7,300,000   $ 7,300,000   $ 7,000,000
Commitments To Originate Loans Held For Sale          
Credit Derivatives [Line Items]          
Commitments 201,663   201,663    
Interest rate forward sales commitments          
Credit Derivatives [Line Items]          
Commitments $ 327,666   $ 327,666