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v3.25.1

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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