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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, 2014
Jun. 30, 2013
Impaired loans (less specific allowance) [Member]
    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total Fair Value $ 40,590 $ 39,035
Gains (Losses) 0   
Foreclosed Assets [Member]
    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total Fair Value 292 511
Gains (Losses) (23) 29
Other real estate owned [Member]
    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total Fair Value 6,114 7,992
Gains (Losses) (71) (705)
Level 3 Inputs [Member] | Impaired loans (less specific allowance) [Member]
    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total Fair Value 40,590 39,035
Level 3 Inputs [Member] | Foreclosed Assets [Member]
    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total Fair Value 292 511
Level 3 Inputs [Member] | Other real estate owned [Member]
    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total Fair Value $ 6,114 $ 7,992