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Loans and the Allowance for Credit Losses - Summary of Age Analysis of Loan Categories (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Current | $ 7,706,453 | $ 7,610,687
Total Past Due | 50,299 | 45,594
Total loans | 7,756,752 | 7,656,281
90 Days or More Past Due and Accruing | 5,425 | 4,077
Loans held for sale, current | 20,715 | 8,994
Loans held for sale | 20,715 | 8,994
Total loans, current | 7,727,168 | 7,619,681
Total loans | 7,777,467 | 7,665,275
Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 580,598 | 591,623
Total Past Due | 7,147 | 7,708
Total loans | 587,745 | 599,331
90 Days or More Past Due and Accruing | 420 | 705
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 3,835,488 | 3,841,425
Total Past Due | 19,165 | 12,270
Total loans | 3,854,653 | 3,853,695
90 Days or More Past Due and Accruing | 1,769 | 175
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 1,620,684 | 1,593,519
Total Past Due | 17,890 | 18,088
Total loans | 1,638,574 | 1,611,607
90 Days or More Past Due and Accruing | 2,724 | 2,820
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 340,640 | 322,584
Total Past Due | 2,865 | 3,604
Total loans | 343,505 | 326,188
90 Days or More Past Due and Accruing | 283 | 364
Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 509,062 | 526,660
Total Past Due | 1,342 | 1,412
Total loans | 510,404 | 528,072
90 Days or More Past Due and Accruing | 834 |
Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 3,326,426 | 3,314,765
Total Past Due | 17,823 | 10,858
Total loans | 3,344,249 | 3,325,623
90 Days or More Past Due and Accruing | 935 | 175
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 1,329,043 | 1,261,536
Total Past Due | 3,232 | 3,924
Total loans | 1,332,275 | 1,265,460
90 Days or More Past Due and Accruing | 229 | 13
Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 8,107 | 8,910
Total Past Due | 26,694 | 21,790
Total loans | 34,801 | 30,700
TDRs Accruing Interest [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 5,566 | 5,586
Total Past Due | 274 | 158
Total loans | 5,840 | 5,744
Total Impaired [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 13,673 | 14,496
Total Past Due | 26,968 | 21,948
Total loans | 40,641 | 36,444
30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 12,269 | 9,952
30-59 Days Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 2,328 | 2,500
30-59 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 4,028 | 2,328
30-59 Days Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 3,560 | 2,717
30-59 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 1,678 | 2,084
30-59 Days Past Due [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 127 | 62
30-59 Days Past Due [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 3,901 | 2,266
30-59 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 675 | 323
30-59 Days Past Due [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 656 | 337
30-59 Days Past Due [Member] | TDRs Accruing Interest [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 64 | 59
30-59 Days Past Due [Member] | Total Impaired [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 720 | 396
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 7,673 | 11,475
60-89 Days Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 748 | 1,273
60-89 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 2,116 | 3,600
60-89 Days Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 3,789 | 5,001
60-89 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 805 | 1,007
60-89 Days Past Due [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 84 | 1,350
60-89 Days Past Due [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 2,032 | 2,250
60-89 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 215 | 594
60-89 Days Past Due [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 1,156 | 1,370
60-89 Days Past Due [Member] | TDRs Accruing Interest [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 160 | 92
60-89 Days Past Due [Member] | Total Impaired [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 1,316 | 1,462
90 Days or More Past Due [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 30,357 | 24,167
90 Days or More Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 4,071 | 3,935
90 Days or More Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 13,021 | 6,342
90 Days or More Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 10,541 | 10,370
90 Days or More Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 382 | 513
90 Days or More Past Due [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 1,131 |
90 Days or More Past Due [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 11,890 | 6,342
90 Days or More Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 2,342 | 3,007
90 Days or More Past Due [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 24,882 | 20,083
90 Days or More Past Due [Member] | TDRs Accruing Interest [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 50 | 7
90 Days or More Past Due [Member] | Total Impaired [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | $ 24,932 | $ 20,090

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