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Fair Values of Assets and Liabilities - Schedule of Assets Measured on Non-Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans $ 45,699 $ 50,559
Other real estate owned 10,758 12,924
Total Assets 56,457 63,483
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 0 0
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 1,368,311 1,343,224
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 32,940 36,903
Other real estate owned 10,601 12,752
Total Assets 43,541 49,655
Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 29,296 24,943
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 12,759 13,656
Other real estate owned 157 172
Total Assets $ 12,916 $ 13,828