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Loans and ACL - Summary of Aging of loans held for investment by loan category (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Days past due | $ 1,911,528 | $ 2,110,755
Nonaccrual | 24,327 | 22,957
Deferred costs, net of loan fees | 1,198 | 1,042
Total | 1,912,726 | 2,111,797
Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 24,327 | 22,957
Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 9,055 | 2,447
Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 15,272 | 20,510
30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 3,552 | 7,130
60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 3,528 | 2,041
Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 4,252 | 2,486
Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 1,877,067 | 2,077,183
Deferred costs, net of loan fees | 1,198 | 1,042
Commercial and Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 276,609 | 354,904
Nonaccrual | 8,449 | 10,185
Commercial and Industrial [Member] | Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 481 | 778
Commercial and Industrial [Member] | Non accrual loans with an allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 7,968 | 9,407
Commercial and Industrial [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,328 | 1,335
Commercial and Industrial [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,171 | 1,232
Commercial and Industrial [Member] | Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,700 | 2,259
Commercial and Industrial [Member] | Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 263,961 | 339,893
Construction, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 73,473 | 114,491
Nonaccrual |  | 220
Construction, Commercial [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual |  | 220
Construction, Commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 236 |
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 | 73,237 | 114,238
Construction, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 50,892 | 51,807
Construction, Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 154 |
Construction, Residential [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 50,738 | 51,807
Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 818,101 | 847,842
Nonaccrual | 7,751 | 4,235
Commercial [Member] | Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 5,699 |
Commercial [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 2,052 | 4,235
Commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 303 | 625
Commercial [Member] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 831 |
Commercial [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 809,216 | 842,982
Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 654,030 | 692,253
Nonaccrual | 7,552 | 7,497
Residential [Member] | Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 2,875 | 1,669
Residential [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 4,677 | 5,828
Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 536 | 3,874
Residential [Member] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,351 | 476
Residential [Member] | Greater than 90 Days Past Due & Accruing [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 2,350 |
Residential [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 642,241 | 680,406
Farmland [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 4,645 | 5,520
Farmland [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 4,645 | 5,520
Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 33,778 | 43,938
Nonaccrual | 575 | 820
Consumer [Member] | Non accrual loans with an allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 575 | 820
Consumer [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 995 | 1,296
Consumer [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 175 | 300
Consumer [Member] | Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 202 | 227
Consumer [Member] | Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | $ 31,831 | $ 41,295

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