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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 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Days past due | $ 2,179,508 | $ 2,430,117
Nonaccrual | 28,349 | 60,026
Gross loans | 2,179,508 | 2,430,117
Deferred costs, net of loan fees | 905 | 830
Total | 2,180,413 | 2,430,947
Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 28,349 | 60,026
Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 2,496 | 4,088
Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 25,853 | 55,938
30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 9,071 | 14,282
60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,930 | 1,913
Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 3,725 | 3,037
Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 2,137,338 | 2,351,689
Deferred costs, net of loan fees | 905 | 830
Commercial and Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 378,922 | 508,944
Nonaccrual | 11,470 | 39,429
Gross loans | 378,922 | 508,944
Commercial and Industrial [Member] | Nonaccrual loans with no allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 11,470 | 1,487
Commercial and Industrial [Member] | Non accrual loans with an allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual |  | 37,942
Commercial and Industrial [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,640 | 2,235
Gross loans | 1,640 | 2,235
Commercial and Industrial [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,253 | 632
Gross loans | 1,253 | 632
Commercial and Industrial [Member] | Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 3,142 | 1,709
Gross loans | 3,142 | 1,709
Commercial and Industrial [Member] | Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 361,417 | 464,939
Construction, commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 116,276 | 180,052
Nonaccrual | 313 | 383
Gross loans | 116,276 | 180,052
Construction, commercial [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 313 | 383
Construction, commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due |  | 2,016
Gross loans |  | 2,016
Construction, commercial [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 115,963 | 177,653
Construction, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 43,322 | 75,832
Gross loans | 43,322 | 75,832
Construction, Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due |  | 523
Gross loans |  | 523
Construction, Residential [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 43,322 | 75,309
Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 873,721 | 870,540
Nonaccrual | 7,329 | 11,880
Gross loans | 873,721 | 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 | 7,329 | 9,856
Commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 4,252 | 2,109
Gross loans | 4,252 | 2,109
Commercial [Member] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due |  | 714
Gross loans |  | 714
Commercial [Member] | Greater than 90 Days Past Due & Accruing [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due |  | 574
Gross loans |  | 574
Commercial [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 862,140 | 855,263
Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 713,442 | 730,110
Nonaccrual | 8,589 | 7,580
Gross loans | 713,442 | 730,110
Residential [Member] | Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 2,496 | 577
Residential [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 6,093 | 7,003
Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,237 | 5,101
Gross loans | 1,237 | 5,101
Residential [Member] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 77 | 288
Gross loans | 77 | 288
Residential [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 703,539 | 717,141
Farmland [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 5,619 | 5,470
Gross loans | 5,619 | 5,470
Farmland [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 5,619 | 5,470
Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 48,206 | 59,169
Nonaccrual | 648 | 754
Gross loans | 48,206 | 59,169
Consumer [Member] | Non accrual loans with an allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 648 | 754
Consumer [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due |  | 2,298
Gross loans |  | 2,298
Consumer [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,942 |
Gross loans | 1,942 |
Consumer [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 600 | 279
Gross loans | 600 | 279
Consumer [Member] | Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 583 | 754
Gross loans | 583 | 754
Consumer [Member] | Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | $ 44,433 | $ 55,084

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