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Loans and the Allowance for Credit Losses - Summary of Age Analysis of Loan Categories (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Current | $ 7,695,972 | $ 7,610,687
Total Past Due | 41,882 | 45,594
Total loans | 7,737,854 | 7,656,281
90 Days or More Past Due and Accruing | 2,634 | 4,077
Loans held for sale, current | 18,649 | 8,994
Loans held for sale | 18,649 | 8,994
Total loans, current | 7,714,621 | 7,619,681
Total loans | 7,756,503 | 7,665,275
Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 584,058 | 591,623
Total Past Due | 6,245 | 7,708
Total loans | 590,303 | 599,331
90 Days or More Past Due and Accruing | 533 | 705
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 3,864,327 | 3,841,425
Total Past Due | 13,306 | 12,270
Total loans | 3,877,633 | 3,853,695
90 Days or More Past Due and Accruing | 587 | 175
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 1,617,430 | 1,593,519
Total Past Due | 16,183 | 18,088
Total loans | 1,633,613 | 1,611,607
90 Days or More Past Due and Accruing | 1,173 | 2,820
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 333,279 | 322,584
Total Past Due | 2,449 | 3,604
Total loans | 335,728 | 326,188
90 Days or More Past Due and Accruing | 244 | 364
Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 482,016 | 526,660
Total Past Due | 1,030 | 1,412
Total loans | 483,046 | 528,072
Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 3,382,311 | 3,314,765
Total Past Due | 12,276 | 10,858
Total loans | 3,394,587 | 3,325,623
90 Days or More Past Due and Accruing | 587 | 175
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 1,296,878 | 1,261,536
Total Past Due | 3,699 | 3,924
Total loans | 1,300,577 | 1,265,460
90 Days or More Past Due and Accruing | 97 | 13
Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 9,310 | 8,910
Total Past Due | 23,588 | 21,790
Total loans | 32,898 | 30,700
TDRs Accruing Interest [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 5,273 | 5,586
Total Past Due | 214 | 158
Total loans | 5,487 | 5,744
Total Impaired [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Current | 14,583 | 14,496
Total Past Due | 23,802 | 21,948
Total loans | 38,385 | 36,444
30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 13,901 | 9,952
30-59 Days Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 2,073 | 2,500
30-59 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 3,262 | 2,328
30-59 Days Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 5,962 | 2,717
30-59 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 1,682 | 2,084
30-59 Days Past Due [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 965 | 62
30-59 Days Past Due [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 2,297 | 2,266
30-59 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 922 | 323
30-59 Days Past Due [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 1,170 | 337
30-59 Days Past Due [Member] | TDRs Accruing Interest [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 10 | 59
30-59 Days Past Due [Member] | Total Impaired [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 1,180 | 396
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 5,040 | 11,475
60-89 Days Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 412 | 1,273
60-89 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 1,531 | 3,600
60-89 Days Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 2,449 | 5,001
60-89 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 506 | 1,007
60-89 Days Past Due [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 45 | 1,350
60-89 Days Past Due [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 1,486 | 2,250
60-89 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 142 | 594
60-89 Days Past Due [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 2,169 | 1,370
60-89 Days Past Due [Member] | TDRs Accruing Interest [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 146 | 92
60-89 Days Past Due [Member] | Total Impaired [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 2,315 | 1,462
90 Days or More Past Due [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 22,941 | 24,167
90 Days or More Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 3,760 | 3,935
90 Days or More Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 8,513 | 6,342
90 Days or More Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 7,772 | 10,370
90 Days or More Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 261 | 513
90 Days or More Past Due [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 20 |
90 Days or More Past Due [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 8,493 | 6,342
90 Days or More Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 2,635 | 3,007
90 Days or More Past Due [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 20,249 | 20,083
90 Days or More Past Due [Member] | TDRs Accruing Interest [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | 58 | 7
90 Days or More Past Due [Member] | Total Impaired [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total Past Due | $ 20,307 | $ 20,090

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