Derivatives (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) contracts	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) contracts	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) contracts
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Counterparty default losses on forward contracts	$ 0	$ 0	$ 0	$ 0
Credit Derivatives [Line Items]
Commitments
Collateralized financings	13,400		13,400
Termination value of derivatives in a net liability position	282,100		282,100		8,700
Collateral required to be posted under agreements	96,900		96,900		92,600
Variation Margin Adjustment	238,300		238,300		(172,900)
Interest rate futures
Credit Derivatives [Line Items]
Derivative, notional amount	155,000		155,000
Mortgage-Backed Security
Credit Derivatives [Line Items]
Derivative, notional amount	14,100		14,100
Interest rate swaps
Credit Derivatives [Line Items]
Derivative, notional amount	$ 7,300,000		$ 7,300,000		$ 7,000,000
Number of interest rate swaps | contracts	932		932		936
Commitments To Originate Loans Held For Sale
Credit Derivatives [Line Items]
Commitments	$ 131,443		$ 131,443
Interest rate forward sales commitments
Credit Derivatives [Line Items]
Commitments	$ 247,469		$ 247,469