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Loans and ACL - Summary of Aging of loans held for investment by loan category (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Days past due | $ 1,977,738 | $ 2,110,755
Nonaccrual | 22,106 | 22,957
Deferred costs, net of loan fees | 847 | 1,042
Total | 1,978,585 | 2,111,797
Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 22,106 | 22,957
Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 3,085 | 2,447
Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 19,021 | 20,510
30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 3,722 | 7,130
60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 7,061 | 2,041
Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,881 | 2,486
Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 1,943,815 | 2,077,183
Deferred costs, net of loan fees | 847 | 1,042
Commercial and Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 323,976 | 354,904
Nonaccrual | 9,160 | 10,185
Commercial and Industrial [Member] | Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 353 | 778
Commercial and Industrial [Member] | Non accrual loans with an allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 8,807 | 9,407
Commercial and Industrial [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,049 | 1,335
Commercial and Industrial [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,042 | 1,232
Commercial and Industrial [Member] | Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,643 | 2,259
Commercial and Industrial [Member] | Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 311,082 | 339,893
Construction, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 78,476 | 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] | 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 | 78,476 | 114,238
Construction, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 52,031 | 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 | 51,877 | 51,807
Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 810,978 | 847,842
Nonaccrual | 4,033 | 4,235
Commercial [Member] | Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 1,125 |
Commercial [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 2,908 | 4,235
Commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 511 | 625
Commercial [Member] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 3,073 |
Commercial [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 803,361 | 842,982
Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 671,317 | 692,253
Nonaccrual | 8,244 | 7,497
Residential [Member] | Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 1,607 | 1,669
Residential [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 6,637 | 5,828
Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 930 | 3,874
Residential [Member] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 2,745 | 476
Residential [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 659,398 | 680,406
Farmland [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 4,723 | 5,520
Farmland [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 4,723 | 5,520
Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 36,237 | 43,938
Nonaccrual | 669 | 820
Consumer [Member] | Non accrual loans with an allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 669 | 820
Consumer [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,078 | 1,296
Consumer [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 201 | 300
Consumer [Member] | Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 238 | 227
Consumer [Member] | Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | $ 34,051 | $ 41,295

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