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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