Loans and Allowance for Credit Losses on Loans - Additional Information (Details)	9 Months Ended
	Sep. 30, 2024 USD ($) factor	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Loans And Leases Receivable Disclosure [Line Items]
Number of past due days	90 days
Historical loss of reversion period, baseline scenario	1 year
Historical loss of reversion period, adverse scenario	2 years
Number of matrix factors | factor	9
Non accrual loan threshold	$ 500,000
Collateral dependent loans	1,931,007,000		$ 1,765,845,000
Allowance for credit losses on loans	22,960,000	$ 22,760,000	21,993,000	$ 21,617,000	$ 20,802,000	$ 19,241,000
Additional commitments lend to borrowers whose loans were modified	2,000,000.0
Loan Borrowing
Loans And Leases Receivable Disclosure [Line Items]
Loans	0		0
Collateralized Debt Obligations
Loans And Leases Receivable Disclosure [Line Items]
Collateral dependent loans	2,500,000		5,200,000
Allowance for credit losses on loans	$ 434,000		$ 355,000