Derivative Financial Instruments - Summary of Interest Rate Swap Derivatives Designated as Fair Value Accounting Hedges of Fixed-rate Receivables (Detail) - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value	$ 100,000,000	$ 100,000,000
Weighted Average Remaining Maturity (years)	2 years 9 months 18 days	3 years 7 months 6 days
Fair Value	$ (2,943,000)	$ (2,679,000)
Pay	4.47%	4.47%
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember	us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Loans [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value	$ 100,000,000	$ 100,000,000
Weighted Average Remaining Maturity (years)	2 years 9 months 18 days	3 years 7 months 6 days
Fair Value	$ (2,943,000)	$ (2,679,000)
Pay	4.47%	4.47%
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember	us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember