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Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans and TDRs (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | $ 34,801 | $ 30,700
TDRs | 7,185 | 8,599
Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 5,840 | 5,744
Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 1,345 | 2,855
Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 554 |
Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 12,036 | 8,413
TDRs | 1,531 | 2,409
Commercial Real Estate - Improved Property [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 1,334 | 880
Commercial Real Estate - Improved Property [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 197 | 1,529
Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 2,374 | 3,260
TDRs | 185 | 337
Commercial and Industrial [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 185 | 168
Commercial and Industrial [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs |  | 169
Home Equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 5,299 | 4,610
TDRs | 746 | 624
Home Equity [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 477 | 426
Home Equity [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 269 | 198
Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 12,590 | 8,413
TDRs | 1,531 | 2,409
Commercial Real Estate [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 1,334 | 880
Commercial Real Estate [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 197 | 1,529
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 14,171 | 13,831
TDRs | 4,662 | 5,106
Residential Real Estate [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 3,794 | 4,185
Residential Real Estate [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 868 | 921
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans | 367 | 586
TDRs | 61 | 123
Consumer [Member] | Accruing TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | 50 | 85
Consumer [Member] | Non-Accrual TDRs [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
TDRs | $ 11 | $ 38

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