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Loans and Leases and the Allowance for Credit Losses - Summary of Current, Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | $ 1,926,000 | $ 2,166,000
Total | 135,920,000 | 134,068,000
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 132,200,000 | 129,839,000
30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,506,000 | 1,724,000
Accruing Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 288,000 | 339,000
Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 810,000 | 670,000
Total | 61,012,000 | 57,010,000
Commercial and industrial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 59,926,000 | 56,091,000
Commercial and industrial | 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 265,000 | 238,000
Commercial and industrial | Accruing Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,000 | 11,000
Commercial Real Estate | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 578,000 | 869,000
Total | 22,371,000 | 25,277,000
Commercial Real Estate | Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 21,560,000 | 24,072,000
Commercial Real Estate | Commercial | 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 231,000 | 311,000
Commercial Real Estate | Commercial | Accruing Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,000 | 25,000
Commercial Real Estate | Residential builder and developer |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 2,000 | 3,000
Total | 992,000 | 1,073,000
Commercial Real Estate | Residential builder and developer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 981,000 | 1,065,000
Commercial Real Estate | Residential builder and developer | 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 9,000 | 5,000
Commercial Real Estate | Residential builder and developer | Accruing Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Commercial Real Estate | Other commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 84,000 | 171,000
Total | 5,320,000 | 6,653,000
Commercial Real Estate | Other commercial construction | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,123,000 | 6,322,000
Commercial Real Estate | Other commercial construction | 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 113,000 | 159,000
Commercial Real Estate | Other commercial construction | Accruing Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 1,000
Residential Real Estate | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 219,000 | 215,000
Total | 22,196,000 | 22,353,000
Residential Real Estate | Residential | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 21,042,000 | 21,080,000
Total | 21,042,000 | 21,080,000
Residential Real Estate | Residential | 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 667,000 | 763,000
Residential Real Estate | Residential | Accruing Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 268,000 | 295,000
Total | 268,000 | 295,000
Residential Real Estate | Residential — limited documentation |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 57,000 | 55,000
Total | 823,000 | 911,000
Residential Real Estate | Residential — limited documentation | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 737,000 | 825,000
Total | 737,000 | 825,000
Residential Real Estate | Residential — limited documentation | 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 29,000 | 31,000
Residential Real Estate | Residential — limited documentation | Accruing Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Total | 0 | 0
Consumer: | Home equity lines and loans |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 82,000 | 81,000
Total | 4,576,000 | 4,649,000
Consumer: | Home equity lines and loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,464,000 | 4,528,000
Total | 4,464,000 | 4,528,000
Consumer: | Home equity lines and loans | 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 30,000 | 40,000
Consumer: | Home equity lines and loans | Accruing Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Total | 0 | 0
Consumer: | Recreational finance |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 28,000 | 36,000
Total | 11,739,000 | 10,058,000
Consumer: | Recreational finance | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,621,000 | 9,935,000
Total | 11,621,000 | 9,935,000
Consumer: | Recreational finance | 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 90,000 | 87,000
Consumer: | Recreational finance | Accruing Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Total | 0 | 0
Consumer: | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 11,000 | 14,000
Total | 4,743,000 | 3,992,000
Consumer: | Automobile | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,680,000 | 3,918,000
Total | 4,680,000 | 3,918,000
Consumer: | Automobile | 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 52,000 | 60,000
Consumer: | Automobile | Accruing Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Total | 0 | 0
Consumer: | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans | 55,000 | 52,000
Total | 2,148,000 | 2,092,000
Consumer: | Other | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,066,000 | 2,003,000
Consumer: | Other | 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 20,000 | 30,000
Consumer: | Other | Accruing Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 7,000 | $ 7,000

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