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Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans and TDRs (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | $ 34,575 | $ 36,880
TDRs | 5,331 | 5,755
Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 3,563 | 3,927
Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 1,768 | 1,828
Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 1,571 | 3,302
TDRs | 104 | 111
Commercial and Industrial [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 104 | 111
Home Equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 5,181 | 5,345
TDRs | 641 | 663
Home Equity [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 388 | 363
Home Equity [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 253 | 300
Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 9,127 | 9,963
TDRs | 583 | 820
Commercial Real Estate [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 426 | 655
Commercial Real Estate [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 157 | 165
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 120 | 469
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 9,007 | 9,494
TDRs | 583 | 820
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 426 | 655
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 157 | 165
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 18,358 | 17,925
TDRs | 3,985 | 4,133
Residential Real Estate [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 2,632 | 2,779
Residential Real Estate [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 1,353 | 1,354
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 338 | 345
TDRs | 18 | 28
Consumer [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 13 | 19
Consumer [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | $ 5 | $ 9

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