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Disclosures about Fair Value of Assets and Liabilities - Realized Gains and Losses included in Net Income for Periods in Condensed Consolidated Statements of Income (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Hedged Loans [Member]
      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Included in net income   $ 74  
Non Interest Income [Member]
      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Included in net income (667) 196 255
Non Interest Income [Member] | Hedged Loans [Member]
      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Included in net income (2,267) 28 147
Non Interest Income [Member] | Fair value interest rate swap agreements [Member]
      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Included in net income 2,267 (28) (147)
Non Interest Income [Member] | Derivative loan commitments [Member]
      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Included in net income $ (667) $ 196 $ 255