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Loans Receivable and Allowance for Loan Losses - Restructured Loans Included in Nonaccrual Status Were Modified as Troubled Debt Restructurings within Previous 12 Months and for Which There was Payment Default (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Contract
Dec. 31, 2011
Contract
Dec. 31, 2013
Commercial [Member]
Contract
Dec. 31, 2012
Commercial Real Estate [Member]
Owner-Occupied [Member]
Contract
Dec. 31, 2011
Commercial Real Estate [Member]
Owner-Occupied [Member]
Contract
Dec. 31, 2012
Commercial Real Estate [Member]
Non-owner Occupied Residential [Member]
Contract
Dec. 31, 2011
Commercial Real Estate [Member]
Non-owner Occupied Residential [Member]
Contract
Dec. 31, 2011
Acquisition and Development [Member]
Commercial and Land Development [Member]
Contract
Dec. 31, 2011
Residential Mortgage [Member]
First Lien [Member]
Contract
Financing Receivable, Modifications [Line Items]                  
Troubled debt restructurings at periods end, Number of Contracts 5 10 1 1 1 4 6 2 1
Troubled debt restructurings at period end, Recorded Investment $ 1,216 $ 3,538 $ 199 $ 7 $ 54 $ 1,209 $ 2,035 $ 905 $ 544