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Loans and ACL - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) Loan	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Interest income from nonaccrual loans	$ 289,000	$ 275,000	$ 437,000	$ 463,000
Accrued interest excluded from ACL	9,000,000		9,000,000		$ 10,700,000
Loans pledged	1,911,528,000		1,911,528,000		2,110,755,000
Recorded investment of PCD Loans			30,000,000		43,800,000
Recorded investment, estimated allowance for credit loss			200,000		300,000
Recorded investment, PCD Discount (Premium)			2,200,000		3,000,000
Granted TLM	523,000	1,555,000	$ 2,602,000	1,973,000
Number of residential mortgage loans in the process of foreclosure | Loan			6
Mortgage loans with total amortized cost			$ 2,700,000
Unfunded commitments	0		0		0
Extension and Principal Forbearance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Granted TLM	0	229,000	0	229,000
Extended Maturity [Member]
Loans and Leases Receivable Disclosure [Line Items]
Granted TLM	523,000	632,000	2,463,000	670,000
Commercial and Residential Mortgages Loans [Member] | Asset Pledged as Collateral without Right [Member] | Federal Home Loan Bank Advances [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	736,000,000		736,000,000		797,700,000
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	276,609,000		276,609,000		354,904,000
Commercial and Industrial [Member] | Extension and Principal Forbearance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Granted TLM	0	229,000	0	229,000
Commercial and Industrial [Member] | Extended Maturity [Member]
Loans and Leases Receivable Disclosure [Line Items]
Granted TLM	0	$ 560,000	1,940,000	$ 560,000
Commercial and Industrial [Member] | Asset Pledged as Collateral without Right [Member] | FRB [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	$ 75,400,000		$ 75,400,000		$ 91,600,000

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