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Loans and the Allowance for Credit Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | $ 37,167 |  | $ 37,167 |  | $ 45,688
Recorded Investment, With no specific allowance recorded | 27,118 |  | 27,118 |  | 36,444
Unpaid Principal Balance, With a specific allowance recorded | 11,866 |  | 11,866 |  |
Recorded Investment, With a specific allowance recorded | 11,267 |  | 11,267 |  |
Related Allowance, With a specific allowance recorded | 1,511 |  | 1,511 |  |
Total impaired loans, Unpaid principal balance | 49,033 |  | 49,033 |  | 45,688
Total impaired loans, Recorded investment | 38,385 |  | 38,385 |  | 36,444
Total impaired loans, Related Allowance | 1,511 |  | 1,511 |  |
Average recorded investment, with no related specific allowance | 27,207 | $ 38,130 | 30,284 | $ 39,066 |
Interest income recognized, With no related specific allowance |  | 94 |  | 515 |
Average recorded investment, With a specific allowance recorded | 9,843 | 1,052 | 6,561 | 1,403 |
Interest income recognized, With a specific allowance recorded | 86 |  | 170 |  |
Total impaired loans, Average recorded investment | 37,050 | 39,182 | 36,845 | 40,469 |
Total impaired loans, Interest income recognized | 86 | 94 | 170 | 515 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 13,572 |  | 13,572 |  | 20,270
Recorded Investment, With no specific allowance recorded | 11,896 |  | 11,896 |  | 18,016
Unpaid Principal Balance, With a specific allowance recorded | 5,358 |  | 5,358 |  |
Recorded Investment, With a specific allowance recorded | 4,922 |  | 4,922 |  |
Related Allowance, With a specific allowance recorded | 12 |  | 12 |  |
Average recorded investment, with no related specific allowance | 11,845 | 18,264 | 13,902 | 18,434 |
Interest income recognized, With no related specific allowance |  | 61 |  | 127 |
Average recorded investment, With a specific allowance recorded | 5,000 |  | 3,333 |  |
Interest income recognized, With a specific allowance recorded | 60 |  | 118 |  |
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 416 |  | 416 |  | 846
Recorded Investment, With no specific allowance recorded | 311 |  | 311 |  | 671
Unpaid Principal Balance, With a specific allowance recorded | 113 |  | 113 |  |
Recorded Investment, With a specific allowance recorded | 74 |  | 74 |  |
Related Allowance, With a specific allowance recorded | 1 |  | 1 |  |
Average recorded investment, with no related specific allowance | 337 | 758 | 448 | 823 |
Interest income recognized, With no related specific allowance |  | 2 |  | 5 |
Average recorded investment, With a specific allowance recorded | 89 |  | 59 |  |
Interest income recognized, With a specific allowance recorded | 1 |  | 2 |  |
Home Equity [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 5,247 |  | 5,247 |  | 5,924
Recorded Investment, With no specific allowance recorded | 4,450 |  | 4,450 |  | 5,036
Unpaid Principal Balance, With a specific allowance recorded | 990 |  | 990 |  |
Recorded Investment, With a specific allowance recorded | 922 |  | 922 |  |
Related Allowance, With a specific allowance recorded | 8 |  | 8 |  |
Average recorded investment, with no related specific allowance | 4,487 | 5,068 | 4,670 | 5,098 |
Interest income recognized, With no related specific allowance |  | 6 |  | 11 |
Average recorded investment, With a specific allowance recorded | 859 |  | 573 |  |
Interest income recognized, With a specific allowance recorded | 7 |  | 15 |  |
Commercial Real Estate - Land and Construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 347 |  | 347 |  |
Recorded Investment, With no specific allowance recorded | 295 |  | 295 |  |
Average recorded investment, with no related specific allowance | 290 | 400 | 193 | 346 |
Commercial Real Estate - Improved Property [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 13,499 |  | 13,499 |  | 14,038
Recorded Investment, With no specific allowance recorded | 7,312 |  | 7,312 |  | 9,293
Unpaid Principal Balance, With a specific allowance recorded | 5,211 |  | 5,211 |  |
Recorded Investment, With a specific allowance recorded | 5,157 |  | 5,157 |  |
Related Allowance, With a specific allowance recorded | 1,479 |  | 1,479 |  |
Average recorded investment, with no related specific allowance | 7,287 | 10,604 | 7,955 | 11,357 |
Interest income recognized, With no related specific allowance |  | 23 |  | 368 |
Average recorded investment, With a specific allowance recorded | 3,645 | 1,052 | 2,430 | 1,403 |
Interest income recognized, With a specific allowance recorded | 14 |  | 28 |  |
Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 4,086 |  | 4,086 |  | 4,610
Recorded Investment, With no specific allowance recorded | 2,854 |  | 2,854 |  | $ 3,428
Unpaid Principal Balance, With a specific allowance recorded | 194 |  | 194 |  |
Recorded Investment, With a specific allowance recorded | 192 |  | 192 |  |
Related Allowance, With a specific allowance recorded | 11 |  | 11 |  |
Average recorded investment, with no related specific allowance | 2,961 | 3,036 | 3,116 | 3,008 |
Interest income recognized, With no related specific allowance |  | $ 2 |  | $ 4 |
Average recorded investment, With a specific allowance recorded | 250 |  | 166 |  |
Interest income recognized, With a specific allowance recorded | $ 4 |  | $ 7 |  |

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