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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
Mar. 31, 2013
Impaired Loans
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total Fair value $ 7,743
OREO | Not covered by loss share agreements
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total Fair value 2,870
OREO | Covered by loss share agreements
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total Fair value 3,938
Level 3 | Impaired Loans
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total Fair value 7,743
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 2,870
Level 3 | OREO | Covered by loss share agreements
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total Fair value $ 3,938