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, Allowance for Credit Losses and Credit Quality - Additional Information (Details)	9 Months Ended
	Sep. 30, 2024 USD ($) Segment	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Financing Receivable Modifications [Line Items]
Number of primary loan portfolio segments \| Segment	3
Accrued interest on loans	$ 14,621,000		$ 14,091,000
Allowance for credit losses	31,077,000	$ 30,916,000	28,991,000	$ 27,832,000	$ 26,889,000	$ 24,310,000
Loans Receivable
Financing Receivable Modifications [Line Items]
Accrued interest on loans	11,800,000		$ 11,300,000
Unfunded Lending Commitments
Financing Receivable Modifications [Line Items]
Allowance for credit losses	$ 0