Fair Value Measurements - Schedule of Assets Measured on Nonrecurring Basis (Detail) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated collateral dependent loans	$ 2,256,000	$ 0
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated collateral dependent loans	1,577,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated collateral dependent loans	679,000
Level III [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated collateral dependent loans	2,256,000
Level III [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated collateral dependent loans	1,577,000
Level III [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated collateral dependent loans	$ 679,000