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Loans and ACL - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2025 USD ($) Loan	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Interest income from nonaccrual loans	$ 118,000	$ 65,000
Accrued interest excluded from ACL	10,700,000		$ 10,700,000
Loans pledged	2,059,281,000		2,110,755,000
Recorded investment of PCD Loans	39,500,000		43,800,000
Recorded investment, estimated allowance for credit loss	255,000		262,000
Recorded investment, PCD Discount (Premium)	$ 2,800,000		3,000,000
Revised maturity date	Jun. 30, 2027
Number of residential mortgage loans in the process of foreclosure | Loan	5
Mortgage loans with total amortized cost	$ 755,000
Unfunded commitments	$ 0		0
Extension and Principal Forbearance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Granted loan maturity period	18 months
Extended Maturity [Member]
Loans and Leases Receivable Disclosure [Line Items]
Granted loan maturity period	72 months
Forgiveness [Member]
Loans and Leases Receivable Disclosure [Line Items]
Accrued interest amount	$ 40,000
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	772,400,000		797,700,000
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	340,099,000		354,904,000
Commercial and Industrial [Member] | Asset Pledged as Collateral without Right [Member] | FRB [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	$ 68,500,000		$ 91,600,000
Residential Mortgages [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and forbearance loan units | Loan	3

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