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mortgage loans with an amortized cost.

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Recorded investment of PCD loans.

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The amount of unfunded commitments to borrowers.

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Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration.

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Amount of discount (premium) attributable to other factors on financing receivable purchased with credit deterioration.

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Loans and ACL - Additional Information (Detail)	3 Months Ended			6 Months Ended		12 Months Ended
Loans and ACL - Additional Information (Detail)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($) Loan	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) Loan	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Interest income from nonaccrual loans	$ 30,000		$ 122,000	$ 148,000	$ 187,000
Accrued interest excluded from ACL	10,000,000			10,000,000		$ 10,700,000
Loans pledged	1,977,738,000			1,977,738,000		2,110,755,000
Recorded investment of PCD Loans				39,100,000		43,800,000
Recorded investment, estimated allowance for credit loss				200,000		300,000
Recorded investment, PCD Discount (Premium)				2,500,000		3,000,000
Granted TLM	0		$ 0	$ 2,165,000	225,000
Revised maturity date				Jun. 30, 2027
Number of residential mortgage loans in the process of foreclosure \| Loan				9
Mortgage loans with total amortized cost				$ 1,600,000
Unfunded commitments	0			0		0
Extension and Principal Forbearance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Granted TLM				2,024,000	0
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	749,700,000			749,700,000		797,700,000
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	323,976,000			323,976,000		354,904,000
Commercial and Industrial [Member] \| Extension and Principal Forbearance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Granted TLM				2,024,000	$ 0
Commercial and Industrial [Member] \| Asset Pledged as Collateral without Right [Member] \| FRB [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	$ 75,100,000			$ 75,100,000		$ 91,600,000
Residential Mortgages [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and forbearance loan units \| Loan		3