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Loans and the Allowance for Credit Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | $ 39,890 |  | $ 39,890 |  | $ 45,688
Recorded Investment, With no specific allowance recorded | 29,599 |  | 29,599 |  | 36,444
Unpaid Principal Balance, With a specific allowance recorded | 11,591 |  | 11,591 |  |
Recorded Investment, With a specific allowance recorded | 11,042 |  | 11,042 |  |
Related Allowance, With a specific allowance recorded | 1,501 |  | 1,501 |  |
Total impaired loans, Unpaid principal balance | 51,481 |  | 51,481 |  | 45,688
Total impaired loans, Recorded investment | 40,641 |  | 40,641 |  | 36,444
Total impaired loans, Related Allowance | 1,501 |  | 1,501 |  |
Average recorded investment, with no related specific allowance | 28,360 | $ 37,542 | 30,114 | $ 38,225 |
Interest income recognized, With no related specific allowance |  | 99 |  | 614 |
Average recorded investment, With a specific allowance recorded | 11,156 |  | 7,683 | 1,052 |
Interest income recognized, With a specific allowance recorded | 99 |  | 269 |  |
Total impaired loans, Average recorded investment | 39,516 | 37,542 | 37,797 | 39,277 |
Total impaired loans, Interest income recognized | 99 | 99 | 269 | 614 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 15,090 |  | 15,090 |  | 20,270
Recorded Investment, With no specific allowance recorded | 13,303 |  | 13,303 |  | 18,016
Unpaid Principal Balance, With a specific allowance recorded | 5,096 |  | 5,096 |  |
Recorded Investment, With a specific allowance recorded | 4,662 |  | 4,662 |  |
Related Allowance, With a specific allowance recorded | 12 |  | 12 |  |
Average recorded investment, with no related specific allowance | 12,600 | 18,336 | 13,752 | 18,207 |
Interest income recognized, With no related specific allowance |  | 68 |  | 195 |
Average recorded investment, With a specific allowance recorded | 4,792 |  | 3,666 |  |
Interest income recognized, With a specific allowance recorded | 51 |  | 169 |  |
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 442 |  | 442 |  | 846
Recorded Investment, With no specific allowance recorded | 356 |  | 356 |  | 671
Unpaid Principal Balance, With a specific allowance recorded | 99 |  | 99 |  |
Recorded Investment, With a specific allowance recorded | 61 |  | 61 |  |
Related Allowance, With a specific allowance recorded | 1 |  | 1 |  |
Average recorded investment, with no related specific allowance | 334 | 692 | 425 | 776 |
Interest income recognized, With no related specific allowance |  | 3 |  | 8 |
Average recorded investment, With a specific allowance recorded | 68 |  | 60 |  |
Interest income recognized, With a specific allowance recorded | 1 |  | 3 |  |
Home Equity [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 5,866 |  | 5,866 |  | 5,924
Recorded Investment, With no specific allowance recorded | 5,030 |  | 5,030 |  | 5,036
Unpaid Principal Balance, With a specific allowance recorded | 774 |  | 774 |  |
Recorded Investment, With a specific allowance recorded | 746 |  | 746 |  |
Related Allowance, With a specific allowance recorded | 7 |  | 7 |  |
Average recorded investment, with no related specific allowance | 4,740 | 4,924 | 4,760 | 4,997 |
Interest income recognized, With no related specific allowance |  | 8 |  | 19 |
Average recorded investment, With a specific allowance recorded | 834 |  | 616 |  |
Interest income recognized, With a specific allowance recorded | 8 |  | 23 |  |
Commercial Real Estate - Land and Construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 606 |  | 606 |  |
Recorded Investment, With no specific allowance recorded | 554 |  | 554 |  |
Average recorded investment, with no related specific allowance | 425 |  | 284 | 260 |
Commercial Real Estate - Improved Property [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 14,162 |  | 14,162 |  | 14,038
Recorded Investment, With no specific allowance recorded | 7,982 |  | 7,982 |  | 9,293
Unpaid Principal Balance, With a specific allowance recorded | 5,435 |  | 5,435 |  |
Recorded Investment, With a specific allowance recorded | 5,388 |  | 5,388 |  |
Related Allowance, With a specific allowance recorded | 1,471 |  | 1,471 |  |
Average recorded investment, with no related specific allowance | 7,647 | 10,409 | 7,962 | 11,000 |
Interest income recognized, With no related specific allowance |  | 15 |  | 383 |
Average recorded investment, With a specific allowance recorded | 5,273 |  | 3,170 | 1,052 |
Interest income recognized, With a specific allowance recorded | 35 |  | 63 |  |
Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 3,724 |  | 3,724 |  | 4,610
Recorded Investment, With no specific allowance recorded | 2,374 |  | 2,374 |  | $ 3,428
Unpaid Principal Balance, With a specific allowance recorded | 187 |  | 187 |  |
Recorded Investment, With a specific allowance recorded | 185 |  | 185 |  |
Related Allowance, With a specific allowance recorded | 10 |  | 10 |  |
Average recorded investment, with no related specific allowance | 2,614 | 3,181 | 2,931 | 2,985 |
Interest income recognized, With no related specific allowance |  | $ 5 |  | $ 9 |
Average recorded investment, With a specific allowance recorded | 189 |  | 171 |  |
Interest income recognized, With a specific allowance recorded | $ 4 |  | $ 11 |  |

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