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Other Real Estate Owned - Summary of Activity Related to Other Real Estate Owned (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Summary of the Activity Related to Other Real Estate Owned [Line Items]    
Balance, beginning of period $ 23,602 $ 16,595
Acquisitions      
Additions 10,246 32,331
Dispositions (16,902) (20,185)
Valuation adjustments (1,047) (5,139)
Balance, end of period 15,899 23,602
Non-Covered [Member]
    
Summary of the Activity Related to Other Real Estate Owned [Line Items]    
Balance, beginning of period 13,820 5,290
Acquisitions      
Additions 8,508 16,081
Dispositions (7,035) (6,896)
Valuation adjustments (461) (655)
Balance, end of period 14,832 13,820
Covered [Member]
    
Summary of the Activity Related to Other Real Estate Owned [Line Items]    
Balance, beginning of period 9,782 11,305
Acquisitions      
Additions 1,738 16,250
Dispositions (9,867) (13,289)
Valuation adjustments (586) (4,484)
Balance, end of period $ 1,067 $ 9,782