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Loans and ACL - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Interest income from nonaccrual loans | $ 65 | $ 89 |
Accrued interest excluded from ACL | 12,900 |  | $ 13,200
Loans pledged | 2,393,364 |  | 2,430,117
Recorded investment of PCD Loans | 51,000 |  | 51,000
Recorded investment, estimated allowance for credit loss | 522 |  | 529
Recorded investment, PCD Discount (Premium) | 3,700 |  | 3,800
Mortgage loans with amortized cost | 1,300 |  |
Doubtful [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Commercial and industrial loan amount | 32,300 |  |
Attributable to specific reserve | 29,800 |  |
Collective specific reserve | 9,600 |  |
Loans pledged | 32,307 |  | 37,137
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 | 815,200 |  | 767,100
Commercial and Industrial [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans pledged | 489,972 |  | 508,944
Commercial and Industrial [Member] | Asset Pledged as Collateral without Right [Member] | Federal Reserve Bank Borrowings [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans pledged | 101,800 |  | 161,000
Commercial and Industrial [Member] | Doubtful [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans pledged | $ 32,307 |  | $ 37,136

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