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Loans and Allowance for Credit Losses - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans pledged |  |  | $ 2,110,755,000 | $ 2,430,117,000
Total charge-offs |  |  | 28,437,000 | 31,819,000
Recorded investment of PCD Loans |  |  | 43,800,000 | 51,000,000
Recorded investment, estimated allowance for credit loss |  |  | 262,000 | 529,000
Recorded investment, PCD Discount (Premium) |  |  | 3,000,000 | 3,800,000
Recovery of credit losses |  |  | 18,467,000 | 4,851,000
Financing Receivable, Modified in Period, Amount |  |  | 3,520,000 | 44,060,000
Financing receivable, allowance for credit loss, writeoff |  |  | 28,437,000 | 31,819,000
Unfunded commitments |  |  | 0 | 0
Mortgage loans with amortized cost |  |  | 169,000 | 134,000
Accrued interest receivable |  |  | 12,537,000 | 14,967,000
Accrued interest excluded from ACL |  |  | 10,700,000 | 13,200,000
Interest income from nonaccrual loans |  |  | 534,000 | 223,000
Payment Deferral [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | 1,346,000 | 759,000
Reclassification [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Total charge-offs |  | $ 9,400,000 |  |
Financing receivable, allowance for credit loss, writeoff |  | $ 9,400,000 |  |
Related Party [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Recovery of credit losses | $ 8,400,000 |  |  |
Doubtful [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans pledged |  |  | 1,654,000 | 37,137,000
Commercial and industrial loan amount |  |  |  | 37,100,000
Collective specific reserve |  |  |  | 9,600,000
Attributable to specific reserve |  |  |  | 34,200,000
Grade 7 Substandard [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans pledged |  |  | 64,697,000 | 56,687,000
Commercial and Residential Mortgages [Member] | Asset Pledged As Collateral Without Right [Member] | Federal Home Loan Bank Advances [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans pledged |  |  | 797,900,000 | 767,100,000
Commercial and Industrial [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans pledged |  |  | 354,904,000 | 508,944,000
Total charge-offs |  |  | 24,005,000 | 27,837,000
Recovery of credit losses |  |  | 17,348,000 | 3,675,000
Financing Receivable, Modified in Period, Amount |  |  |  | 32,800,000
Financing receivable, allowance for credit loss, writeoff |  |  | 24,005,000 | 27,837,000
Commercial and Industrial [Member] | Payment Deferral [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | 836,000 | 182,000
Commercial and Industrial [Member] | Asset Pledged As Collateral Without Right [Member] | FRB [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans pledged |  |  | 91,600,000 | 161,000,000
Commercial and Industrial [Member] | Doubtful [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans pledged |  |  | 83,000 | 37,136,000
Commercial and Industrial [Member] | Grade 7 Substandard [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans pledged |  |  | $ 22,157,000 | $ 15,197,000

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