Commitments and Contingencies (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Financial guarantees in connection with standby letters of credit	$ 0	$ 0	$ 0	$ 0
Standby letters of credit expiring within one year	158,000,000		158,000,000
Standby letters of credit expiring thereafter	7,800,000		7,800,000
Residential mortgage loan repurchase reserve liability	200,000		200,000
Loss Contingency Accrual	4,600,000		4,600,000
Concentration Risk [Line Items]
Prior Bankruptcy Recoveries by Plaintiffs	110,000,000		110,000,000
GNMA Loans past due by 90 days, but not yet repurchased	$ 1,600,000		1,600,000
Minimum
Concentration Risk [Line Items]
Loss Contingency, Damages Sought, Value			386,200,000
Maximum
Concentration Risk [Line Items]
Loss Contingency, Damages Sought, Value			$ 429,800,000
Product Concentration Risk | Revenue Benchmark | Real Estate Loans As Part Of Loan Portfolio
Concentration Risk [Line Items]
Concentration risk (as a percent)			75.00%		78.00%