Allowance for Credit Losses (Narrative) (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) contract	Dec. 31, 2021 USD ($) contract	Dec. 31, 2020 USD ($) contract
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued interest related to financial assets held at amortized cost	$ 214,000,000	$ 117,400,000
Financial Asset, Amortized Cost, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest Receivable and Other Assets	Interest Receivable and Other Assets
Nonaccrual loans with no related allowance for credit losses	$ 21,100,000
Loans reasonably expected to be modified into TDRs	0
Provision for (reversal of) credit losses	78,179,000	$ (59,280,000)
Loan net charge-offs	20,300,000
Provision for credit losses	$ 410,000	$ 17,000
TDRs, count | contract	40	64	124
Foreclosed residential real estate properties	$ 1,600,000
TDRs, balance	$ 13,377,000	$ 13,869,000	$ 45,872,000
Weighted average extension term	69 months	83 months	14 months
Weighted average decrease in stated interest rate	0.88%	1.37%	1.29%
Interest-only payment terms	8 months	3 months	12 months
Loan forgiveness	$ 0	$ 0	$ 453,000
Financing Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans modified in TDRs	$ 41,100,000
TDRs, count | contract	191
Allowance for loan losses related to impaired loans	$ 871,000,000
Financing Receivable | Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded investment, foreclosure proceedings in process	$ 59,500,000	$ 9,600,000