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Fair Value Measurements - Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Impaired loans (less specific allowance) [Member]
    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total Fair Value $ 39,035 $ 43,125
Foreclosed Assets [Member]
    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total Fair Value 511 135
Gains (Losses) 29 (86)
Other real estate owned [Member]
    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total Fair Value 7,992 10,088
Gains (Losses) (705) (1,067)
Level 3 Inputs [Member] | Impaired loans (less specific allowance) [Member]
    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total Fair Value 39,035 43,125
Level 3 Inputs [Member] | Foreclosed Assets [Member]
    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total Fair Value 511 135
Level 3 Inputs [Member] | Other real estate owned [Member]
    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total Fair Value $ 7,992 $ 10,088