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Loans and Allowance for Credit Losses - Summary of Aging of loans held for investment by loan category (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Days past due | $ 2,110,755 | $ 2,430,117
Nonaccrual | 22,957 | 60,026
Deferred costs, net of loan fees | 1,042 | 830
Total | 2,111,797 | 2,430,947
Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 22,957 | 60,026
Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 2,447 | 4,088
Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 20,510 | 55,938
30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 7,130 | 14,282
60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 2,041 | 1,913
Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 2,486 | 3,037
Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 2,077,183 | 2,351,689
Deferred costs, net of loan fees | 1,042 | 830
Commercial and Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 354,904 | 508,944
Nonaccrual | 10,185 | 39,429
Commercial and Industrial [Member] | Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 778 | 1,487
Commercial and Industrial [Member] | Non accrual loans with an allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 9,407 |
Commercial and Industrial [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
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 | 1,335 | 2,235
Commercial and Industrial [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,232 | 632
Commercial and Industrial [Member] | Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 2,259 | 1,709
Commercial and Industrial [Member] | Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 339,893 | 464,939
Construction, commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual |  | 383
Construction, commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 114,491 | 180,052
Nonaccrual | 220 | 383
Construction, commercial [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual |  | 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] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 33 |
Construction, commercial [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 114,238 | 177,653
Construction, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 51,807 | 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 | 51,807 | 75,309
Commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual |  | 11,880
Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 847,842 | 870,540
Nonaccrual | 4,235 | 11,880
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 | 4,235 | 9,856
Commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 625 | 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 | 842,982 | 855,263
Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual |  | 7,580
Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 692,253 | 730,110
Nonaccrual | 7,497 | 7,580
Residential [Member] | Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 1,669 | 577
Residential [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 5,828 | 7,003
Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 3,874 | 5,101
Residential [Member] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 476 | 288
Residential [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 680,406 | 717,141
Farmland [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 5,520 | 5,470
Farmland [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 5,520 | 5,470
Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 43,938 | 59,169
Nonaccrual | 820 | 754
Consumer [Member] | Non accrual loans with an allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 820 |
Consumer [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual |  | 754
Consumer [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,296 | 2,298
Consumer [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 300 | 279
Consumer [Member] | Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 227 | 754
Consumer [Member] | Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | $ 41,295 | $ 55,084

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