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Loans and Loans Held for Sale - Restructured Loans for Periods Presented (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
SecurityLoan
Jun. 30, 2014
USD ($)
SecurityLoan
Jun. 30, 2015
USD ($)
SecurityLoan
Jun. 30, 2014
USD ($)
SecurityLoan
Dec. 31, 2014
USD ($)
Financing Receivable, Modifications [Line Items]          
Threshold period of satisfactory performance for TDR to be restored to accruing status     6 months    
Restructured loans $ 796 [1] $ 229 [1] $ 5,381 [2] $ 2,019 [1]  
Number of TDRs returned to accruing status | SecurityLoan 6 0 6 0  
TDRs returned to accruing status $ 300   $ 300    
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of) 7.00%   7.00%   7.00%
Performing Financial Instruments [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     $ 32,559   $ 36,983
Performing Financial Instruments [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     13,045   16,939
Performing Financial Instruments [Member] | Commercial and Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     7,899   8,074
Performing Financial Instruments [Member] | Construction Loans [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     5,655   5,736
Performing Financial Instruments [Member] | Residential Mortgage [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     2,622   2,839
Performing Financial Instruments [Member] | Home Equity [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     3,302   3,342
Performing Financial Instruments [Member] | Consumer Borrower [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     36   53
Nonperforming Financial Instruments [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     8,928   5,436
Nonperforming Financial Instruments [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     3,553   2,180
Nonperforming Financial Instruments [Member] | Commercial and Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     2,226   356
Nonperforming Financial Instruments [Member] | Construction Loans [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     1,969   1,869
Nonperforming Financial Instruments [Member] | Residential Mortgage [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     609   459
Nonperforming Financial Instruments [Member] | Home Equity [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     411   562
Nonperforming Financial Instruments [Member] | Consumer Borrower [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     160   10
Financing Receivable [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     41,487   42,419
Financing Receivable [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     16,598   19,119
Financing Receivable [Member] | Commercial and Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     10,125   8,430
Financing Receivable [Member] | Construction Loans [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     7,624   7,605
Financing Receivable [Member] | Residential Mortgage [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     3,231   3,298
Financing Receivable [Member] | Home Equity [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     3,713   3,904
Financing Receivable [Member] | Consumer Borrower [Member]          
Financing Receivable, Modifications [Line Items]          
Restructured loans     $ 196   $ 63
[1] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.
[2] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.