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Basis of Presentation (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]          
Customer deposits $ 979,528   $ 979,528   $ 844,785
Contract asset insurance renewals 51,600   51,600   44,300
Residential mortgage loans available-for-sale fair value 438,205   438,205   947,139
Residential mortgage loans available-for-sale aggregate outstanding principal balance 454,700   454,700   924,500
Net gains from the sale of mortgages 34,400 $ 58,400 $ 131,900 $ 192,600  
Variability in future cash flows of derivative instruments in days     90 days    
Assets In-Scope Under Accounting Standards Codification 326 215,900   $ 215,900   208,400
Interest rate lock commitments          
Finite-Lived Intangible Assets [Line Items]          
Derivative, notional amount 1,300,000   1,300,000   337,900
Forward contracts          
Finite-Lived Intangible Assets [Line Items]          
Derivative, notional amount 1,500,000   1,500,000   903,000
Whole loan commitments          
Finite-Lived Intangible Assets [Line Items]          
Derivative, notional amount $ 270,900   $ 270,900   $ 310,000