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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, 2012
Jun. 30, 2012
Dec. 31, 2011
Financing Receivable, Modifications [Line Items]      
Pre-Modification Outstanding Recorded Investment $ 1,557 $ 5,151  
Post-Modification Outstanding Recorded Investment 1,543 5,135 40,474
Reserve Difference (161) [1] (298) [1]  
Reserve 259 500  
Agricultural
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 0 0  
Post-Modification Outstanding Recorded Investment     12
Commercial and Industrial
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 5 7  
Pre-Modification Outstanding Recorded Investment 376 407  
Post-Modification Outstanding Recorded Investment 375 401 1,956
Reserve Difference (16) [1] (28) [1]  
Reserve 45 49  
Consumer loans
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 9 13  
Pre-Modification Outstanding Recorded Investment 633 861  
Post-Modification Outstanding Recorded Investment 631 858 3,209
Reserve Difference (193) [1] (207) [1]  
Reserve 129 141  
Small Business Administration Loans
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 0 1  
Pre-Modification Outstanding Recorded Investment   468  
Post-Modification Outstanding Recorded Investment   475 773
Reserve Difference   2 [1]  
Reserve   119  
Real Estate Loans
      
Financing Receivable, Modifications [Line Items]      
Pre-Modification Outstanding Recorded Investment 548 3,415  
Post-Modification Outstanding Recorded Investment 537 3,401 34,524
Reserve Difference 48 [1] (65) [1]  
Reserve 85 191  
Real Estate Loans | Other construction/Land
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 1 2  
Pre-Modification Outstanding Recorded Investment 59 112  
Post-Modification Outstanding Recorded Investment 59 112 7,497
Reserve Difference 10 [1] 11 [1]  
Reserve 12 12  
Real Estate Loans | 1-4 Family - closed end
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 1 3  
Pre-Modification Outstanding Recorded Investment 233 344  
Post-Modification Outstanding Recorded Investment 222 331 7,600
Reserve Difference 20 [1] 27 [1]  
Reserve 39 47  
Real Estate Loans | Equity Lines
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 1 1  
Pre-Modification Outstanding Recorded Investment 29 29  
Post-Modification Outstanding Recorded Investment 29 29 575
Reserve Difference 13 [1] 13 [1]  
Reserve 29 29  
Real Estate Loans | Commercial real estate - owner occupied
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 1 3  
Pre-Modification Outstanding Recorded Investment 227 2,600  
Post-Modification Outstanding Recorded Investment 227 2,600 3,963
Reserve Difference 5 [1] (71) [1]  
Reserve 5 97  
Real Estate Loans | Commercial real estate - non-owner occupied
      
Financing Receivable, Modifications [Line Items]      
Number of Loans 0 2  
Pre-Modification Outstanding Recorded Investment   330  
Post-Modification Outstanding Recorded Investment   329 14,889
Reserve Difference   (45) [1]  
Reserve   $ 6  
[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.