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Loans and ACL - Summary of Aging of amortized cost of loans held for investment by loan category (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Days past due | $ 2,393,364 | $ 2,430,117
Nonaccrual | 50,874 | 60,026
Gross loans | 2,393,364 | 2,430,117
Deferred loan fees, net of costs | 725 | 830
Total | 2,394,089 | 2,430,947
Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 50,874 | 60,026
Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 2,428 | 4,088
Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 48,446 | 55,938
30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 19,976 | 14,282
60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 2,498 | 1,913
Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 2,309 | 3,037
Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current, Total | 2,318,432 | 2,351,689
Deferred loan fees, net of costs | 725 | 830
Commercial and Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 489,972 | 508,944
Nonaccrual | 33,946 | 39,429
Gross loans | 489,972 | 508,944
Commercial and Industrial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due |  | 180,052
Commercial and Industrial [Member] | Nonaccrual loans with no allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual |  | 1,487
Commercial and Industrial [Member] | Non accrual loans with an allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 33,946 | 37,942
Commercial and Industrial [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 4,357 | 2,235
Commercial and Industrial [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,609 | 632
Commercial and Industrial [Member] | Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,904 | 1,709
Commercial and Industrial [Member] | Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current, Total | 448,156 | 464,939
Construction, commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 156,943 |
Nonaccrual | 2,233 | 383
Gross loans | 156,943 | 180,052
Construction, commercial [Member] | Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 1,863 |
Construction, commercial [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 370 | 383
Construction, commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due |  | 2,016
Construction, commercial [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current, Total | 154,710 | 177,653
Construction, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 62,947 | 75,832
Financing Receivable Recorded Investments Current, Total | 62,947 |
Gross loans | 62,947 | 75,832
Construction, Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due |  | 523
Construction, Residential [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current, Total | 62,947 | 75,309
Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 881,798 | 870,540
Nonaccrual | 7,441 | 11,880
Gross loans | 881,798 | 870,540
Commercial [Member] | Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual |  | 2,024
Commercial [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 7,441 | 9,856
Commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 2,297 | 2,109
Commercial [Member] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due |  | 714
Commercial [Member] | Greater than 90 Days Past Due & Accruing [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due |  | 574
Commercial [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current, Total | 872,060 | 855,263
Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 740,249 | 730,110
Nonaccrual | 6,464 | 7,580
Gross loans | 740,249 | 730,110
Residential [Member] | Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 565 | 577
Residential [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 5,899 | 7,003
Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 6,356 | 5,101
Residential [Member] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 419 | 288
Residential [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current, Total | 727,010 | 717,141
Farmland [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 5,673 | 5,470
Gross loans | 5,673 | 5,470
Farmland [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current, Total | 5,673 | 5,470
Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 55,782 | 59,169
Nonaccrual | 790 | 754
Gross loans | 55,782 | 59,169
Consumer [Member] | Non accrual loans with an allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 790 | 754
Consumer [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 6,966 | 2,298
Consumer [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 470 | 279
Consumer [Member] | Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 405 | 754
Consumer [Member] | Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current, Total | $ 47,151 | $ 55,084

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