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Allowance for Loan Losses - Investments in Loans Considered to be Impaired and Related Information on Impaired Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]          
Without a related allowance recorded, Recorded Investment $ 44,574   $ 44,574   $ 45,032
Without a related allowance, Unpaid Principal Balance 60,120   60,120   50,286
Without a related allowance recorded, Related Allowance 0   0   0
With a related allowance recorded, Recorded Investment 5,593   5,593   618
With a related allowance recorded, Unpaid Principal Balance 6,649   6,649   1,468
Impaired Financing Receivable, Recorded Investment 50,167   50,167   45,650
Impaired Financing Receivable, Unpaid Principal Balance, Total 66,769   66,769   51,754
Impaired Financing Receivable, Related Allowance 2,162   2,162   37
Without a related allowance recorded, Average Recorded Investment 47,269 $ 45,651 47,849 $ 45,274  
Without a related allowance recorded, Interest Income Recognized 317 418 673 792  
With a related allowance recorded, Average Recorded Investment 5,879 545 6,275 337  
With a related allowance recorded, Interest Income Recognized 38 2 76 3  
Impaired Financing Receivable, Average Recorded Investment, Total 53,148 46,196 54,124 45,611  
Impaired Financing Receivable, Interest Income Recognized, Total 355 420 749 795  
Commercial and Industrial          
Financing Receivable, Impaired [Line Items]          
Without a related allowance recorded, Recorded Investment 11,313   11,313   14,417
Without a related allowance, Unpaid Principal Balance 12,174   12,174   15,220
Without a related allowance recorded, Related Allowance 0   0   0
With a related allowance recorded, Recorded Investment 4,499   4,499   0
With a related allowance recorded, Unpaid Principal Balance 4,984   4,984   0
Impaired Financing Receivable, Recorded Investment 15,812   15,812   14,417
Impaired Financing Receivable, Unpaid Principal Balance, Total 17,158   17,158   15,220
Impaired Financing Receivable, Related Allowance 1,991   1,991   0
Without a related allowance recorded, Average Recorded Investment 10,959 10,782 11,253 11,162  
Without a related allowance recorded, Interest Income Recognized 98 84 189 146  
With a related allowance recorded, Average Recorded Investment 4,617 0 4,999 0  
With a related allowance recorded, Interest Income Recognized 31 0 63 0  
Impaired Financing Receivable, Average Recorded Investment, Total 15,576 10,782 16,252 11,162  
Impaired Financing Receivable, Interest Income Recognized, Total 129 84 252 146  
Commercial Real Estate          
Financing Receivable, Impaired [Line Items]          
Without a related allowance recorded, Recorded Investment 12,326   12,326   12,661
Without a related allowance, Unpaid Principal Balance 22,765   22,765   13,157
Without a related allowance recorded, Related Allowance 0   0   0
With a related allowance recorded, Recorded Investment 0   0   0
With a related allowance recorded, Unpaid Principal Balance 0   0   0
Impaired Financing Receivable, Recorded Investment 12,326   12,326   12,661
Impaired Financing Receivable, Unpaid Principal Balance, Total 22,765   22,765   13,157
Impaired Financing Receivable, Related Allowance 0   0   0
Without a related allowance recorded, Average Recorded Investment 14,619 19,733 14,798 20,455  
Without a related allowance recorded, Interest Income Recognized 64 158 132 322  
With a related allowance recorded, Average Recorded Investment 0 420 0 211  
With a related allowance recorded, Interest Income Recognized 0 0 0 0  
Impaired Financing Receivable, Average Recorded Investment, Total 14,619 20,153 14,798 20,666  
Impaired Financing Receivable, Interest Income Recognized, Total 64 158 132 322  
Commercial Construction          
Financing Receivable, Impaired [Line Items]          
Without a related allowance recorded, Recorded Investment 9,918   9,918   10,998
Without a related allowance, Unpaid Principal Balance 13,494   13,494   14,200
Without a related allowance recorded, Related Allowance 0   0   0
With a related allowance recorded, Recorded Investment 1,064   1,064   500
With a related allowance recorded, Unpaid Principal Balance 1,635   1,635   1,350
Impaired Financing Receivable, Recorded Investment 10,982   10,982   11,498
Impaired Financing Receivable, Unpaid Principal Balance, Total 15,129   15,129   15,550
Impaired Financing Receivable, Related Allowance 141   141   3
Without a related allowance recorded, Average Recorded Investment 10,625 8,119 10,669 6,628  
Without a related allowance recorded, Interest Income Recognized 48 81 108 134  
With a related allowance recorded, Average Recorded Investment 1,232 0 1,244 0  
With a related allowance recorded, Interest Income Recognized 6 0 12 0  
Impaired Financing Receivable, Average Recorded Investment, Total 11,857 8,119 11,913 6,628  
Impaired Financing Receivable, Interest Income Recognized, Total 54 81 120 134  
Consumer Real Estate          
Financing Receivable, Impaired [Line Items]          
Without a related allowance recorded, Recorded Investment 10,983   10,983   6,845
Without a related allowance, Unpaid Principal Balance 11,646   11,646   7,521
Without a related allowance recorded, Related Allowance 0   0   0
With a related allowance recorded, Recorded Investment 29   29   116
With a related allowance recorded, Unpaid Principal Balance 29   29   116
Impaired Financing Receivable, Recorded Investment 11,012   11,012   6,961
Impaired Financing Receivable, Unpaid Principal Balance, Total 11,675   11,675   7,637
Impaired Financing Receivable, Related Allowance 29   29   32
Without a related allowance recorded, Average Recorded Investment 11,028 6,891 11,089 6,943  
Without a related allowance recorded, Interest Income Recognized 107 91 243 186  
With a related allowance recorded, Average Recorded Investment 29 121 30 122  
With a related allowance recorded, Interest Income Recognized 1 2 1 3  
Impaired Financing Receivable, Average Recorded Investment, Total 11,057 7,012 11,119 7,065  
Impaired Financing Receivable, Interest Income Recognized, Total 108 93 244 189  
Other Consumer          
Financing Receivable, Impaired [Line Items]          
Without a related allowance recorded, Recorded Investment 34   34   111
Without a related allowance, Unpaid Principal Balance 41   41   188
Without a related allowance recorded, Related Allowance 0   0   0
With a related allowance recorded, Recorded Investment 1   1   2
With a related allowance recorded, Unpaid Principal Balance 1   1   2
Impaired Financing Receivable, Recorded Investment 35   35   113
Impaired Financing Receivable, Unpaid Principal Balance, Total 42   42   190
Impaired Financing Receivable, Related Allowance 1   1   $ 2
Without a related allowance recorded, Average Recorded Investment 38 126 40 86  
Without a related allowance recorded, Interest Income Recognized 0 4 1 4  
With a related allowance recorded, Average Recorded Investment 1 4 2 4  
With a related allowance recorded, Interest Income Recognized 0 0 0 0  
Impaired Financing Receivable, Average Recorded Investment, Total 39 130 42 90  
Impaired Financing Receivable, Interest Income Recognized, Total $ 0 $ 4 $ 1 $ 4