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Additional Details Related to Loans Classified as TDR's (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Financing Receivable, Modifications [Line Items]    
Pre-Modification Outstanding Recorded Investment $ 5,209 $ 1,705
Post-Modification Outstanding Recorded Investment 5,207 2,061
Reserve Difference (1) [1] (82) [1]
Reserve 100 146
Consumer Loans
    
Financing Receivable, Modifications [Line Items]    
Number of Loans 0 4
Pre-Modification Outstanding Recorded Investment 0 228
Post-Modification Outstanding Recorded Investment 0 227
Reserve Difference 0 [1] (14) [1]
Reserve 0 12
Commercial and Industrial
    
Financing Receivable, Modifications [Line Items]    
Number of Loans 3 2
Pre-Modification Outstanding Recorded Investment 1,457 25
Post-Modification Outstanding Recorded Investment 1,457 25
Reserve Difference (38) [1] (11) [1]
Reserve 57 2
Small Business Loans
    
Financing Receivable, Modifications [Line Items]    
Number of Loans 5 1
Pre-Modification Outstanding Recorded Investment 263 468
Post-Modification Outstanding Recorded Investment 263 475
Reserve Difference 31 [1] 2 [1]
Reserve 39 118
Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Pre-Modification Outstanding Recorded Investment 3,489 984
Post-Modification Outstanding Recorded Investment 3,487 1,334
Reserve Difference 6 [1] (59) [1]
Reserve 4 14
Real Estate Loans | 1-4 Family - closed end
    
Financing Receivable, Modifications [Line Items]    
Number of Loans 1 2
Pre-Modification Outstanding Recorded Investment 3,240 110
Post-Modification Outstanding Recorded Investment 3,240 110
Reserve Difference 0 [1] 6 [1]
Reserve 0 8
Real Estate Loans | Commercial real estate - owner occupied
    
Financing Receivable, Modifications [Line Items]    
Number of Loans 0 2
Pre-Modification Outstanding Recorded Investment 0 747
Post-Modification Outstanding Recorded Investment 0 1,097
Reserve Difference 0 [1] (71) [1]
Reserve 0 0
Real Estate Loans | Commercial real estate - non-owner occupied
    
Financing Receivable, Modifications [Line Items]    
Number of Loans 0 1
Pre-Modification Outstanding Recorded Investment 0 74
Post-Modification Outstanding Recorded Investment 0 74
Reserve Difference 0 [1] 6 [1]
Reserve 0 6
Other construction/Land | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Number of Loans 1 1
Pre-Modification Outstanding Recorded Investment 249 53
Post-Modification Outstanding Recorded Investment 247 53
Reserve Difference 6 [1] 0 [1]
Reserve $ 4 $ 0
[1] This represents the change in the ALLL 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.