Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Parenthetical) (Detail)

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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Parenthetical) (Detail) (Non-recurring Basis [Member], USD $)
Mar. 31, 2014
Dec. 31, 2013
Real estate loans [Member] | Other Real Estate Owned [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-performing loans held for sale   $ 756,000
Real estate loans [Member] | Impaired Loans [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 33,300,000 32,200,000
Commercial and industrial loans [Member] | Impaired Loans [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 2,800,000 2,800,000
Consumer loans [Member] | Impaired Loans [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans $ 1,400,000 $ 1,300,000