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Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans and TDRs (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | $ 38,185 | $ 35,742
TDRs | 4,941 | 5,293
Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 3,230 | 3,746
Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 1,711 | 1,547
Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 2,946 | 5,064
TDRs | 166 | 192
Commercial and Industrial [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 166 | 192
Home Equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 5,044 | 5,163
TDRs | 548 | 535
Home Equity [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 330 | 277
Home Equity [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 218 | 258
Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 16,366 | 7,788
TDRs | 376 | 507
Commercial Real Estate [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 347 | 374
Commercial Real Estate [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 29 | 133
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 112 | 73
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 16,254 | 7,715
TDRs | 376 | 507
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 347 | 374
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 29 | 133
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 13,695 | 17,190
TDRs | 3,826 | 4,031
Residential Real Estate [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 2,362 | 2,875
Residential Real Estate [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 1,464 | 1,156
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 134 | 537
TDRs | 25 | 28
Consumer [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | $ 25 | $ 28

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