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Summary of Financial and Nonfinancial Assets Measured at Fair Value on a Nonrecurring Basis (Detail) (Fair Value on a Nonrecurring, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Impaired Loans
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total Fair value $ 6,315
OREO | Not covered by loss share agreements
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total Fair value 4,740
OREO | Covered by loss share agreements
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total Fair value 6,672
Level 3 | Impaired Loans
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total Fair value 6,315
Level 3 | OREO | Not covered by loss share agreements
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total Fair value 4,740
Level 3 | OREO | Covered by loss share agreements
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total Fair value $ 6,672