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Additional Details Related to Loans Classified as TDR's (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Modifications [Line Items]      
Pre-Modification Outstanding Recorded Investment $ 199 $ 5,409  
Post-Modification Outstanding Recorded Investment 199 5,406 8,467
Reserve Difference 37 [1] 36 [1]  
Reserve 43 124  
Consumer Loans
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 2 7  
Pre-Modification Outstanding Recorded Investment 20 284  
Post-Modification Outstanding Recorded Investment 20 284 1,714
Reserve Difference 2 [1] 33 [1]  
Reserve 6 38  
Commercial and Industrial
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 1 4  
Pre-Modification Outstanding Recorded Investment 50 1,507  
Post-Modification Outstanding Recorded Investment 50 1,507 1,285
Reserve Difference 18 [1] (20) [1]  
Reserve 20 69  
Small Business Loans
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 0 0  
Pre-Modification Outstanding Recorded Investment 0 0  
Post-Modification Outstanding Recorded Investment 0 0 675
Reserve Difference 0 [1] 0 [1]  
Reserve 0 0  
Real Estate Loans
      
Financing Receivable, Modifications [Line Items]      
Pre-Modification Outstanding Recorded Investment 129 3,618  
Post-Modification Outstanding Recorded Investment 129 3,615 4,793
Reserve Difference 17 [1] 23 [1]  
Reserve 17 17  
Real Estate Loans | 1-4 Family - closed end
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 2 3  
Pre-Modification Outstanding Recorded Investment 129 3,369  
Post-Modification Outstanding Recorded Investment 129 3,368 1,351
Reserve Difference 17 [1] 17 [1]  
Reserve 17 17  
Real Estate Loans | Commercial real estate - owner occupied
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 0 0  
Pre-Modification Outstanding Recorded Investment 0 0  
Post-Modification Outstanding Recorded Investment 0 0 2,190
Reserve Difference 0 [1] 0 [1]  
Reserve 0 0  
Real Estate Loans | Commercial real estate - non-owner occupied
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 0 0  
Pre-Modification Outstanding Recorded Investment 0 0  
Post-Modification Outstanding Recorded Investment 0 0 390
Reserve Difference 0 [1] 0 [1]  
Reserve 0 0  
Other construction/Land | Real Estate Loans
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 0 1  
Pre-Modification Outstanding Recorded Investment 0 249  
Post-Modification Outstanding Recorded Investment 0 247 833
Reserve Difference 0 [1] 6 [1]  
Reserve $ 0 $ 0  
[1] This represents the change in the ALL reserve for these credits measured as the difference between the specific post-modification impairment reserve and the pre-modification reserve calculated under our general allowance for loan loss methodology.