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

Loans and Investments - Charge-offs and Recoveries Narratives (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) loan	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Loans and Investments
Allowance for credit losses	$ 122,296	$ 121,331	$ 113,241	$ 131,534	$ 138,447	$ 148,329
Loans Collateralized By Land Development Project [Member]
Loans and Investments
Allowance for credit losses	$ 71,400		$ 71,400
Six loans collateralized by a land development project
Loans and Investments
Number of loans with unpaid principal balance \| loan	6
Unpaid principal balance on loans	$ 121,400
Five loans collateralized by a land development project
Loans and Investments
Number of loans with unpaid principal balance \| loan	5
Unpaid principal balance on loans	$ 112,100
Weighted average accrual rate of interest (as a percent)	7.91%