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Fair Values of Assets and Liabilities - Schedule of Assets Measured on Nonrecurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets $ 1,216,011 $ 1,212,048
Fair Value, Measurements, Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 89,776 100,132
Other real estate owned 12,228 31,670
Total Assets 102,004 131,802
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 555 440
Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Other real estate owned 0 0
Total Assets 0 0
Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 1,190,663 1,173,796
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 82,949 73,783
Other real estate owned 11,981 31,232
Total Assets 94,930 105,015
Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 24,793 37,812
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 6,827 26,349
Other real estate owned 247 438
Total Assets 7,074 26,787
Total Gains (Losses) [Member] | Fair Value, Measurements, Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans (13,793) (24,636)
Other real estate owned (3,772) (8,643)
Total Assets $ (17,565) $ (33,279)