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 ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Commitments And Contingencies [Line Items]
Allowance for credit loss	$ 47,528	$ 45,413	$ 40,966	$ 39,676
Unfunded Commitments [Member] \| Other Liabilities [Member]
Commitments And Contingencies [Line Items]
Allowance for credit loss	$ 4,100	$ 4,100