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Loans and allowance for loan losses - Loan Modification Activities to Borrowers Experiencing Financial Difficulty on Financing Receivables (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | $ 472,000 | $ 441,000 | $ 986,000 | $ 916,000
Percent of Total Loan Class | 0.35% | 0.33% | 0.73% | 0.68%
Guaranteed by Government-Related Entities |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | $ 36,000 | $ 47,000 | $ 70,000 | $ 88,000
Commercial and industrial |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | $ 87,000 | $ 64,000 | $ 223,000 | $ 209,000
Percent of Total Loan Class | 0.14% | 0.11% | 0.36% | 0.35%
Commercial | Commercial Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | $ 319,000 | $ 168,000 | $ 452,000 | $ 377,000
Percent of Total Loan Class | 1.58% | 0.74% | 2.24% | 1.66%
Residential builder and developer | Commercial Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | $ 0 | $ 26,000 | $ 0 | $ 27,000
Percent of Total Loan Class | 0.00% | 2.49% | 0.00% | 2.62%
Other commercial construction | Commercial Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | $ 12,000 | $ 125,000 | $ 214,000 | $ 197,000
Percent of Total Loan Class | 0.27% | 2.18% | 5.03% | 3.44%
Residential | Residential Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | $ 44,000 | $ 58,000 | $ 87,000 | $ 105,000
Percent of Total Loan Class | 0.18% | 0.25% | 0.36% | 0.46%
Home equity lines and loans | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | $ 0 | $ 0 | $ 0 | $ 1,000
Percent of Total Loan Class | 0.00% | 0.00% | 0.00% | 0.03%
Recreational finance | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | $ 0 | $ 0 | $ 0 | $ 0
Percent of Total Loan Class | 0.00% | 0.00% | 0.00% | 0.00%
Automobile | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | $ 0 | $ 0 | $ 0 | $ 0
Percent of Total Loan Class | 0.00% | 0.00% | 0.00% | 0.00%
Other | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | $ 10,000 | $ 0 | $ 10,000 | $ 0
Percent of Total Loan Class | 0.44% | 0.00% | 0.44% | 0.00%
Unfunded Loan Commitment |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | $ 10,000 | $ 1,000 | $ 18,000 | $ 27,000
Term Extension |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 393,000 | 423,000 | 824,000 | 844,000
Term Extension | Commercial and industrial |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 68,000 | 51,000 | 130,000 | 152,000
Term Extension | Commercial | Commercial Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 266,000 | 168,000 | 399,000 | 373,000
Term Extension | Residential builder and developer | Commercial Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 26,000 | 0 | 27,000
Term Extension | Other commercial construction | Commercial Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 12,000 | 125,000 | 214,000 | 197,000
Term Extension | Residential | Residential Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 37,000 | 53,000 | 71,000 | 95,000
Term Extension | Home equity lines and loans | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 0
Term Extension | Recreational finance | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 0
Term Extension | Automobile | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 0
Term Extension | Other | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 10,000 | 0 | 10,000 | 0
Other (a) |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 70,000 | 17,000 | 74,000 | 65,000
Other (a) | Commercial and industrial |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 16,000 | 13,000 | 17,000 | 57,000
Other (a) | Commercial | Commercial Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 53,000 | 0 | 53,000 | 0
Other (a) | Residential builder and developer | Commercial Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 0
Other (a) | Other commercial construction | Commercial Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 0
Other (a) | Residential | Residential Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 1,000 | 4,000 | 4,000 | 8,000
Other (a) | Home equity lines and loans | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 0
Other (a) | Recreational finance | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 0
Other (a) | Automobile | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 0
Other (a) | Other | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 0
Combination of Modification Types |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 9,000 | 1,000 | 88,000 | 7,000
Combination of Modification Types | Commercial and industrial |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 3,000 | 0 | 76,000 | 0
Combination of Modification Types | Commercial | Commercial Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 4,000
Combination of Modification Types | Residential builder and developer | Commercial Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 0
Combination of Modification Types | Other commercial construction | Commercial Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 0
Combination of Modification Types | Residential | Residential Real Estate |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 6,000 | 1,000 | 12,000 | 2,000
Combination of Modification Types | Home equity lines and loans | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 1,000
Combination of Modification Types | Recreational finance | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 0
Combination of Modification Types | Automobile | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | 0 | 0 | 0 | 0
Combination of Modification Types | Other | Consumer |  |  |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |  |  |
Modified in period | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 + Details
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