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Loans and Allowance for Credit Losses - Additional Information (Detail) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) Loan
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans pledged |  | $ 2,430,117 |
Gross loans |  | 2,430,117 | $ 2,412,699
Recorded investment of PCD Loans |  | 51,000 |
Recorded investment, estimated allowance for credit loss |  | 529 |
Recorded investment, PCD Discount (Premium) | $ 5,600 | 3,800 |
Financing receivable, allowance for credit loss, writeoff |  | 31,800 |
Nonperforming trouble debt restructuring |  |  | 38,300
Mortgage loans with amortized cost |  | 134 | $ 0
Number of doubtful loans | Loan |  |  | 0
Accrued interest receivable |  | 14,967 | $ 11,569
Accrued interest excluded from ACL |  | 13,200 |
Interest income from nonaccrual loans |  | 223 |
Commercial Loan [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Attributable to specific reserve |  | 19,500 |
Doubtful [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans pledged |  | 37,137 |
Commercial and industrial loan amount |  | 37,100 |
Collective specific reserve |  | 9,600 |
Attributable to specific reserve |  | 34,200 |
Grade 5 Watch [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Gross loans |  |  | 136,557
Grade 7 Substandard [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans pledged |  | 56,687 |
Gross loans |  |  | 86,879
Paycheck Protection Program [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans pledged |  | 2,386 |
Gross loans |  | 2,386 | 11,967
Commercial and Industrial [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans pledged |  | 506,558 |
Gross loans |  | 506,558 | 590,049
Commercial and Industrial [Member] | Doubtful [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans pledged |  | 37,136 |
Commercial and Industrial [Member] | Grade 7 Substandard [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans pledged |  | 15,197 |
Federal Home Loan Bank Advances [Member] | Asset Pledged As Collateral Without Right [Member] | Paycheck Protection Plan Liquidity Facility Advances [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans pledged |  | 0 | 51
Federal Home Loan Bank Advances [Member] | Asset Pledged As Collateral Without Right [Member] | Commercial and Residential Mortgages [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans pledged |  | 767,100 | $ 436,000
FRB [Member] | Asset Pledged As Collateral Without Right [Member] | Commercial and Industrial [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans pledged |  | $ 161,000 |

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