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Loans and the Allowance for Credit Losses - Summary of Nonperforming Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Financing Receivable, Impaired [Line Items] |  |  |
Total impaired loans, Recorded investment | $ 81,489 |  | $ 39,752
Nonperforming Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 85,547 |  | 46,009
Recorded Investment, With no specific allowance recorded | 71,412 |  | 36,634
Unpaid Principal Balance, With a specific allowance recorded | 10,077 |  | 3,118
Recorded Investment, With a specific allowance recorded | 10,077 |  | 3,118
Related Allowance, With a specific allowance recorded | 8,121 |  | 516
Total impaired loans, Unpaid principal balance | 95,624 |  | 49,127
Total impaired loans, Recorded investment | 81,489 |  | 39,752
Total impaired loans, Related Allowance | 8,121 |  | 516
Average recorded investment, with no related specific allowance | 54,024 | $ 29,864 |
Average recorded investment, With a specific allowance recorded | 6,598 |  |
Total impaired loans, Average recorded investment | 60,622 | 29,864 |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total impaired loans, Recorded investment | 27,183 |  | 19,036
Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total impaired loans, Recorded investment | 26,002 |  | 12,524
Residential Real Estate [Member] | Nonperforming Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 32,857 |  | 17,200
Recorded Investment, With no specific allowance recorded | 26,002 |  | 12,524
Average recorded investment, with no related specific allowance | 19,263 | 11,131 |
Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total impaired loans, Recorded investment | 3,345 |  | 87
Consumer [Member] | Nonperforming Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 3,935 |  | 140
Recorded Investment, With no specific allowance recorded | 3,345 |  | 87
Average recorded investment, with no related specific allowance | 1,716 | 62 |
Home Equity [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total impaired loans, Recorded investment | 7,756 |  | 6,208
Home Equity [Member] | Nonperforming Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 10,408 |  | 8,284
Recorded Investment, With no specific allowance recorded | 7,756 |  | 6,208
Average recorded investment, with no related specific allowance | 6,982 | 4,723 |
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Nonperforming Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average recorded investment, with no related specific allowance |  | 105 |
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total impaired loans, Recorded investment | 27,183 |  | 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 | 27,029 |  | 17,489
Recorded Investment, With no specific allowance recorded | 24,065 |  | 15,918
Unpaid Principal Balance, With a specific allowance recorded | 3,118 |  | 3,118
Recorded Investment, With a specific allowance recorded | 3,118 |  | 3,118
Related Allowance, With a specific allowance recorded | 2,107 |  | 516
Average recorded investment, with no related specific allowance | 19,992 | 11,540 |
Average recorded investment, With a specific allowance recorded | 3,118 |  |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total impaired loans, Recorded investment | 17,203 |  | 1,897
Commercial and Industrial [Member] | Nonperforming Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 11,318 |  | 2,896
Recorded Investment, With no specific allowance recorded | 10,244 |  | $ 1,897
Unpaid Principal Balance, With a specific allowance recorded | 6,959 |  |
Recorded Investment, With a specific allowance recorded | 6,959 |  |
Related Allowance, With a specific allowance recorded | 6,014 |  |
Average recorded investment, with no related specific allowance | 6,071 | $ 2,303 |
Average recorded investment, With a specific allowance recorded | $ 3,480 |  |

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