Basis of Presentation (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Customer deposits	$ 998,936		$ 844,785
Contract asset insurance renewals	47,200		44,300
Residential mortgage loans available-for-sale fair value	510,275		947,139
Residential mortgage loans available-for-sale aggregate outstanding principal balance	512,700		924,500
Net gains from the sale of mortgages	$ 52,400	$ 77,400
Variability in future cash flows of derivative instruments in days	60 days
Assets In-Scope Under Accounting Standards Codification 326	$ 198,000		208,400
Interest rate lock commitments
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount	981,900		337,900
Forward contracts
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount	1,200,000		903,000
Whole loan commitments
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount	$ 254,300		$ 310,000