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Loans and the Allowance for Credit Losses - Summary of Nonperforming Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Total impaired loans, Recorded investment | $ 94,463 |  | $ 94,463 |  | $ 39,752
Nonperforming Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 89,457 |  | 89,457 |  | 46,009
Recorded Investment, With no specific allowance recorded | 69,426 |  | 69,426 |  | 36,634
Unpaid Principal Balance, With a specific allowance recorded | 25,104 |  | 25,104 |  | 3,118
Recorded Investment, With a specific allowance recorded | 25,037 |  | 25,037 |  | 3,118
Related Allowance, With a specific allowance recorded | 13,208 |  | 13,208 |  | 516
Total impaired loans, Unpaid principal balance | 114,561 |  | 114,561 |  | 49,127
Total impaired loans, Recorded investment | 94,463 |  | 94,463 |  | 39,752
Total impaired loans, Related Allowance | 13,208 |  | 13,208 |  | 516
Average recorded investment, with no related specific allowance | 65,957 | $ 32,945 | 59,990 | $ 31,406 |
Average recorded investment, With a specific allowance recorded | 23,447 |  | 15,023 |  |
Total impaired loans, Average recorded investment | 89,404 | 32,945 | 75,013 | 31,406 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Total impaired loans, Recorded investment | 33,543 |  | 33,543 |  | 19,036
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Total impaired loans, Recorded investment | 29,810 |  | 29,810 |  | 12,524
Residential Real Estate [Member] | Nonperforming Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 39,051 |  | 39,051 |  | 17,200
Recorded Investment, With no specific allowance recorded | 29,810 |  | 29,810 |  | 12,524
Average recorded investment, with no related specific allowance | 27,963 | 11,140 | 23,613 | 11,135 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Total impaired loans, Recorded investment | 1,594 |  | 1,594 |  | 87
Consumer [Member] | Nonperforming Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 3,266 |  | 3,266 |  | 140
Recorded Investment, With no specific allowance recorded | 1,594 |  | 1,594 |  | 87
Average recorded investment, with no related specific allowance | 2,087 | 91 | 1,901 | 77 |
Home Equity [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Total impaired loans, Recorded investment | 8,217 |  | 8,217 |  | 6,208
Home Equity [Member] | Nonperforming Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 11,545 |  | 11,545 |  | 8,284
Recorded Investment, With no specific allowance recorded | 8,217 |  | 8,217 |  | 6,208
Average recorded investment, with no related specific allowance | 8,338 | 5,466 | 7,660 | 5,095 |
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Total impaired loans, Recorded investment | 1,688 |  | 1,688 |  |
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Nonperforming Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 1,697 |  | 1,697 |  |
Recorded Investment, With no specific allowance recorded | 1,688 |  | 1,688 |  |
Average recorded investment, with no related specific allowance | 1,526 | 92 | 763 | 99 |
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Total impaired loans, Recorded investment | 31,855 |  | 31,855 |  | 19,036
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Nonperforming Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 21,591 |  | 21,591 |  | 17,489
Recorded Investment, With no specific allowance recorded | 18,555 |  | 18,555 |  | 15,918
Unpaid Principal Balance, With a specific allowance recorded | 13,367 |  | 13,367 |  | 3,118
Recorded Investment, With a specific allowance recorded | 13,300 |  | 13,300 |  | 3,118
Related Allowance, With a specific allowance recorded | 6,396 |  | 6,396 |  | 516
Average recorded investment, with no related specific allowance | 16,934 | 13,992 | 18,463 | 12,766 |
Average recorded investment, With a specific allowance recorded | 14,099 |  | 8,609 |  |
Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Total impaired loans, Recorded investment | 21,299 |  | 21,299 |  | 1,897
Commercial and Industrial [Member] | Nonperforming Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 12,307 |  | 12,307 |  | 2,896
Recorded Investment, With no specific allowance recorded | 9,562 |  | 9,562 |  | $ 1,897
Unpaid Principal Balance, With a specific allowance recorded | 11,737 |  | 11,737 |  |
Recorded Investment, With a specific allowance recorded | 11,737 |  | 11,737 |  |
Related Allowance, With a specific allowance recorded | 6,812 |  | 6,812 |  |
Average recorded investment, with no related specific allowance | 9,109 | $ 2,165 | 7,590 | $ 2,234 |
Average recorded investment, With a specific allowance recorded | $ 9,348 |  | $ 6,414 |  |

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