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Basis of Presentation (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]          
Customer deposits $ 1,027,938   $ 1,027,938   $ 844,785
Contract asset insurance renewals 49,500   49,500   44,300
Residential mortgage loans available-for-sale fair value 553,789   553,789   947,139
Residential mortgage loans available-for-sale aggregate outstanding principal balance 553,900   553,900   924,500
Net gains from the sale of mortgages 45,100 $ 56,700 $ 97,500 $ 134,200  
Variability in future cash flows of derivative instruments in days     60 days    
Assets In-Scope Under Accounting Standards Codification 326 199,900   $ 199,900   208,400
Interest rate lock commitments          
Finite-Lived Intangible Assets [Line Items]          
Derivative, notional amount 1,500,000   1,500,000   337,900
Forward contracts          
Finite-Lived Intangible Assets [Line Items]          
Derivative, notional amount 1,700,000   1,700,000   903,000
Whole loan commitments          
Finite-Lived Intangible Assets [Line Items]          
Derivative, notional amount $ 316,200   $ 316,200   $ 310,000