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Income Tax Expense (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Income Tax Expense Benefit [Line Items]      
Total Current $ 11,106,000 $ 9,919,000 $ 3,124,000
Total Deferred (888,000) (1,337,000) 6,015,000
Total Income Tax Expense 10,218,000 8,582,000 9,139,000
Federal
      
Schedule Of Income Tax Expense Benefit [Line Items]      
Total Current 11,308,000 9,787,000 2,347,000
Total Deferred (863,000) (1,210,000) 5,446,000
State
      
Schedule Of Income Tax Expense Benefit [Line Items]      
Total Current (202,000) 132,000 777,000
Total Deferred $ (25,000) $ (127,000) $ 569,000