Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Commitments and Contingencies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Commitments And Contingencies [Line Items]
Allowance for credit loss	$ 39,676,000	$ 52,420,000	$ 30,482,000	$ 33,914,000
Unfunded Commitments [Member] \| Provision for Credit Losses [Member]
Commitments And Contingencies [Line Items]
Credit Loss Benefit Expense	1,300	1,000,000.0
Unfunded Commitments [Member] \| Other Liabilities [Member]
Commitments And Contingencies [Line Items]
Allowance for credit loss	$ 1,800,000	$ 3,100,000