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Loans and Allowance for Credit Losses - Schedule of Activity with Respect to Related-Party Loans (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Beginning balance $ 6,187 $ 6,682
New loans and reclassified related loans 2,814 306
Repayments (3,015) (801)
Ending balance $ 5,986 $ 6,187