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Loan Transactions with Related Parties (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Related Party Transaction [Line Items]      
Beginning balance $ 16,617 $ 18,406 $ 12,459
Increase in existing loans, including new loans 2,037 2,580 10,079
Decrease in existing loans, including loans paid off (1,473) (4,369) (4,132)
Ending balance $ 17,181 $ 16,617 $ 18,406