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Basis of Presentation (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]      
Customer deposits $ 698,775   $ 675,091
Contract asset insurance renewals 77,800   74,000
Residential mortgage loans available-for-sale fair value 570,839   516,064
Residential mortgage loans available-for-sale aggregate outstanding principal balance 573,700   508,500
Net gains from the sale of mortgages $ 50,600 $ 20,600  
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 $ 706,700   404,700
Forward contracts      
Finite-Lived Intangible Assets [Line Items]      
Derivative, notional amount 990,000   745,000
Whole loan commitments      
Finite-Lived Intangible Assets [Line Items]      
Derivative, notional amount $ 315,500   $ 207,900