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Related-Party Transactions - Loans to Principal Officers, Directors and Affiliates (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Related Party Transaction [Line Items]  
Beginning balance $ 1,154
New loans 357
Effect of changes in composition of related parties (1,463)
Repayments 4
Ending balance $ 52