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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, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Days past due | $ 2,453,128 |
Nonaccrual | 85,166 | $ 76,049
Total Past Due & Nonaccrual |  | 101,277
Gross loans | 2,453,128 | 2,412,699
Less: deferred loan fees, net of costs | (345) | (1,640)
Total | 2,452,783 | 2,411,059
Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 85,166 |
Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 10,888 |
Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 74,278 |
30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 8,986 | 14,663
60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 2,051 | 2,305
Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 2,167 | 8,260
PCI Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
PCI Loans |  | 58,748
Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 2,452,783 | 2,251,034
Less: deferred loan fees, net of costs | (345) | (1,640)
Total | 2,354,413 |
Commercial and Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 566,898 |
Nonaccrual | 65,260 | 68,039
Total Past Due & Nonaccrual |  | 68,806
Gross loans | 566,898 | 590,049
Commercial and Industrial [Member] | Nonaccrual loans with no allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 186 |
Commercial and Industrial [Member] | Non accrual loans with an allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 65,074 |
Commercial and Industrial [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,122 | 488
Nonaccrual | 65,260 |
Commercial and Industrial [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 61 | 279
Commercial and Industrial [Member] | PCI Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
PCI Loans |  | 1,481
Commercial and Industrial [Member] | Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 500,455 | 519,762
Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 7,988 |
Gross loans | 7,988 | 11,967
Paycheck Protection Program [Member] | Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 7,988 | 11,967
Construction, commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 437 |
Construction, commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 180,149 |
Nonaccrual |  | 714
Total Past Due & Nonaccrual |  | 1,870
Gross loans | 180,149 | 183,301
Construction, commercial [Member] | Nonaccrual loans with no allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 0 |
Construction, commercial [Member] | Non accrual loans with an allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 437 |
Construction, commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,106 | 1,137
Nonaccrual | 437 |
Construction, commercial [Member] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 867 | 19
Construction, commercial [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 177,739 | 181,431
Construction, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 92,403 |
Total Past Due & Nonaccrual |  | 2,620
Gross loans | 92,403 | 76,599
Construction, Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 399 | 1,416
Construction, Residential [Member] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 388 | 1,204
Construction, Residential [Member] | PCI Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
PCI Loans |  | 7
Construction, Residential [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 91,616 | 73,972
Mortgage, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 867,916 |
Nonaccrual | 11,571 | 1,658
Total Past Due & Nonaccrual |  | 14,387
Gross loans | 867,916 | 864,989
Mortgage, Commercial [Member] | Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 10,108 |
Mortgage, Commercial [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 1,463 |
Mortgage, Commercial [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 960 | 6,198
Nonaccrual | 11,571 |
Mortgage, Commercial [Member] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due |  | 297
Mortgage, Commercial [Member] | Greater than 90 Days Past Due & Accruing [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due |  | 6,234
Mortgage, Commercial [Member] | PCI Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
PCI Loans |  | 51,223
Mortgage, Commercial [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 855,385 | 799,379
Mortgage, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 672,473 |
Nonaccrual | 7,447 | 5,143
Total Past Due & Nonaccrual |  | 11,916
Gross loans | 672,473 | 631,772
Mortgage, Residential [Member] | Nonaccrual loans with no allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 592 |
Mortgage, Residential [Member] | Non accrual loans with an allowance | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 6,855 |
Mortgage, Residential [Member] | 30-59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 4,153 | 4,544
Nonaccrual | 7,447 |
Mortgage, Residential [Member] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 585 | 231
Mortgage, Residential [Member] | Greater than 90 Days Past Due & Accruing [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,998 | 1,998
Mortgage, Residential [Member] | PCI Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
PCI Loans |  | 5,678
Mortgage, Residential [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 658,290 | 614,178
Mortgage, Farmland [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 6,394 |
Total Past Due & Nonaccrual |  | 75
Gross loans | 6,394 | 6,599
Mortgage, Farmland [Member] | 60-89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due |  | 75
Mortgage, Farmland [Member] | Current Loans [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | 6,394 | 6,524
Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 58,907 |
Nonaccrual | 451 | 495
Total Past Due & Nonaccrual |  | 1,603
Gross loans | 58,907 | 47,423
Consumer [Member] | Nonaccrual loans with no allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 2 |
Consumer [Member] | Non accrual loans with an allowance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 449 |
Consumer [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,246 | 880
Nonaccrual | 451 |
Consumer [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 150 | 200
Consumer [Member] | Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 169 | 28
Consumer [Member] | PCI Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
PCI Loans |  | 359
Consumer [Member] | Current Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable Recorded Investments Current | $ 56,891 | $ 45,461

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