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Allowance for Loan Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current $ 5,322,516 $ 5,002,925
Total nonaccrual loans 42,905 35,382
Total past due 77,747 60,008
Total Loans 5,400,263 5,062,933
Commercial and Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 1,366,728 1,244,802
Total nonaccrual loans 11,342 9,279
Total past due 19,018 12,028
Total Loans 1,385,746 1,256,830
Commercial Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 2,367,849 2,145,655
Total nonaccrual loans 10,887 8,719
Total past due 20,937 20,948
Total Loans 2,388,786 2,166,603
Commercial Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 382,985 401,084
Total nonaccrual loans 8,182 8,753
Total past due 15,137 12,360
Total Loans 398,122 413,444
Residential Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 657,352 631,085
Total nonaccrual loans 9,283 5,629
Total past due 14,313 8,287
Total Loans 671,665 639,372
Home Equity    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 472,085 465,055
Total nonaccrual loans 3,168 2,902
Total past due 8,119 5,790
Total Loans 480,204 470,845
Installment and Other Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 57,916 73,486
Total nonaccrual loans 43 100
Total past due 223 453
Total Loans 58,139 73,939
Consumer Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 5,602 6,579
Total nonaccrual loans 0 0
Total past due 0 0
Total Loans 5,602 6,579
Loans Held for Sale    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Current 11,999 35,179
Total nonaccrual loans 0 0
Total past due 0 142
Total Loans 11,999 35,321
30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 25,871 22,001
30 to 59 Days Past Due | Commercial and Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 7,276 2,453
30 to 59 Days Past Due | Commercial Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 7,384 11,602
30 to 59 Days Past Due | Commercial Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 5,644 3,517
30 to 59 Days Past Due | Residential Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 1,191 1,728
30 to 59 Days Past Due | Home Equity    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 4,223 2,365
30 to 59 Days Past Due | Installment and Other Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 153 242
30 to 59 Days Past Due | Consumer Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 0 0
30 to 59 Days Past Due | Loans Held for Sale    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 0 94
60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 8,971 2,625
60 to 89 Days Past Due | Commercial and Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 400 296
60 to 89 Days Past Due | Commercial Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 2,666 627
60 to 89 Days Past Due | Commercial Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 1,311 90
60 to 89 Days Past Due | Residential Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 3,839 930
60 to 89 Days Past Due | Home Equity    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 728 523
60 to 89 Days Past Due | Installment and Other Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 27 111
60 to 89 Days Past Due | Consumer Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 0 0
60 to 89 Days Past Due | Loans Held for Sale    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due $ 0 $ 48