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Allowance for Loan Losses - Summary of Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period $ 50,347 $ 48,106 $ 48,147 $ 47,911
Charge-offs (3,496) (1,755) (7,123) (3,205)
Recoveries 514 404 1,326 842
Net (Charge-offs)/ Recoveries (2,982) (1,351) (5,797) (2,363)
Provision for loan losses 4,848 2,059 9,863 3,266
Balance at End of Period 52,213 48,814 52,213 48,814
Commercial and Industrial        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 14,740 13,711 10,853 13,668
Charge-offs (136) (992) (2,830) (1,698)
Recoveries 217 89 420 203
Net (Charge-offs)/ Recoveries 81 (903) (2,410) (1,495)
Provision for loan losses (50) 500 6,328 1,135
Balance at End of Period 14,771 13,308 14,771 13,308
Commercial Real Estate        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 15,266 19,071 15,043 20,164
Charge-offs (1,662) (310) (1,715) (376)
Recoveries 38 73 398 176
Net (Charge-offs)/ Recoveries (1,624) (237) (1,317) (200)
Provision for loan losses 2,336 184 2,252 (946)
Balance at End of Period 15,978 19,018 15,978 19,018
Commercial Construction        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 10,825 6,869 12,625 6,093
Charge-offs (945) 0 (945) 0
Recoveries 2 1 3 2
Net (Charge-offs)/ Recoveries (943) 1 (942) 2
Provision for loan losses 1,819 801 18 1,576
Balance at End of Period 11,701 7,671 11,701 7,671
Consumer Real Estate        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 8,261 6,723 8,400 6,333
Charge-offs (290) (177) (522) (552)
Recoveries 134 112 298 248
Net (Charge-offs)/ Recoveries (156) (65) (224) (304)
Provision for loan losses 313 369 242 998
Balance at End of Period 8,418 7,027 8,418 7,027
Other Consumer        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 1,255 1,732 1,226 1,653
Charge-offs (463) (276) (1,111) (579)
Recoveries 123 129 207 213
Net (Charge-offs)/ Recoveries (340) (147) (904) (366)
Provision for loan losses 430 205 1,023 503
Balance at End of Period $ 1,345 $ 1,790 $ 1,345 $ 1,790