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Fair Values of Assets and Liabilities - Schedule of Assets Measured on Nonrecurring Basis (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets $ 966,548 $ 1,368,052
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 43,799 45,790
Other real estate owned 10,047 7,981
Total Assets 53,846 53,771
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 928,720 1,337,633
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 30,979 34,864
Other real estate owned 10,039 7,828
Total Assets 41,018 42,692
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 37,828 30,419
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 12,820 10,926
Other real estate owned 8 153
Total Assets 12,828 11,079
Total Gains (Losses) [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurement Of Assets On Nonrecurring Basis Net Losses On Impaired Loans (9,098) (7,017)
Fair Value Measurement Of Assets On Nonrecurring Basis Net Losses On Other Real Estate Owned (1,693) (1,319)
Fair Value Measurement Of Assets On Nonrecurring Basis Net Loss $ (10,791) $ (8,336)