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Basis of Presentation (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
Finite-Lived Intangible Assets [Line Items]          
Customer deposits $ 597,820   $ 597,820   $ 675,091
Contract asset insurance renewals 87,200   87,200   74,000
Residential mortgage loans available-for-sale fair value 556,664   556,664   516,064
Residential mortgage loans available-for-sale aggregate outstanding principal balance 554,100   554,100   508,500
Net gains from the sale of mortgages 62,000 $ 33,700 $ 173,200 $ 102,800  
Variability in future cash flows of derivative instruments in days     90 days    
Interest rate lock commitments          
Finite-Lived Intangible Assets [Line Items]          
Derivative, notional amount 724,100   $ 724,100   404,700
Forward contracts          
Finite-Lived Intangible Assets [Line Items]          
Derivative, notional amount 1,100,000   1,100,000   745,000
Whole loan commitments          
Finite-Lived Intangible Assets [Line Items]          
Derivative, notional amount $ 298,700   $ 298,700   $ 207,900