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Allowance for Loan Losses - Troubled Debt Restructurings (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
SecurityLoan
Jun. 30, 2014
USD ($)
SecurityLoan
Jun. 30, 2015
USD ($)
SecurityLoan
Jun. 30, 2014
USD ($)
SecurityLoan
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Number | SecurityLoan 3 7 8 16
Pre-mod outstanding principal balance $ 251 $ 946 $ 858 $ 2,433
Post-mod outstanding principal balance 255 962 867 2,417
Financial impact due to TDR taken as additional provision $ 86 $ 12 $ 257 $ 76
Number that defaulted during the period | SecurityLoan 2 2 3 4
Recorded investment of TDRs that defaulted during the period $ 135 $ 315 $ 181 $ 691
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions 0 $ 0 $ 0 $ 0
Home equity lines of credit [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Number | SecurityLoan   1   3
Pre-mod outstanding principal balance   $ 200   $ 479
Post-mod outstanding principal balance   212   491
Number that defaulted during the period | SecurityLoan     1  
Recorded investment of TDRs that defaulted during the period     $ 46  
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions $ 0 $ 0 $ 0 $ 0
RE Mortgage [Member] | Residential [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Number | SecurityLoan   1 1 3
Pre-mod outstanding principal balance   $ 112 $ 108 $ 806
Post-mod outstanding principal balance   $ 112 110 806
Financial impact due to TDR taken as additional provision     $ 8 $ 37
Number that defaulted during the period | SecurityLoan 1 1 1 1
Recorded investment of TDRs that defaulted during the period $ 98 $ 152 $ 98 $ 152
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions $ 0 $ 0 $ 0 $ 0
RE Mortgage [Member] | Commercial [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Number | SecurityLoan   2 1 4
Pre-mod outstanding principal balance   $ 568 $ 124 $ 824
Post-mod outstanding principal balance   571 124 830
Financial impact due to TDR taken as additional provision   $ 8 $ (5) $ 18
Number that defaulted during the period | SecurityLoan 1 1 1 2
Recorded investment of TDRs that defaulted during the period $ 37 $ 163 $ 37 $ 423
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions $ 0 $ 0 $ 0 $ 0
Home equity loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Number | SecurityLoan 1 1 1 1
Pre-mod outstanding principal balance $ 69 $ 32 $ 69 $ 32
Post-mod outstanding principal balance 73 33 74 33
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions 0 0 0 0
Auto Indirect [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions 0 0 $ 0 0
Other Consumer [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Number | SecurityLoan     2  
Pre-mod outstanding principal balance     $ 89  
Post-mod outstanding principal balance     89  
Financial impact due to TDR taken as additional provision     5  
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions $ 0 $ 0 $ 0 $ 0
C&I [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Number | SecurityLoan 2 2 3 3
Pre-mod outstanding principal balance $ 182 $ 34 $ 468 $ 72
Post-mod outstanding principal balance 182 34 470 72
Financial impact due to TDR taken as additional provision 86 4 249 $ 21
Number that defaulted during the period | SecurityLoan       1
Recorded investment of TDRs that defaulted during the period       $ 116
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions 0 0 0 $ 0
Construction [Member] | Residential [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Number | SecurityLoan       1
Pre-mod outstanding principal balance       $ 102
Post-mod outstanding principal balance       85
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions 0 0 0 $ 0
Construction [Member] | Commercial [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Number | SecurityLoan       1
Pre-mod outstanding principal balance       $ 118
Post-mod outstanding principal balance       100
Financial impact due to the default of previous TDR taken as charge-offs or additional provisions $ 0 $ 0 $ 0 $ 0