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Loans Receivable and Allowance for Loan Losses - Troubled Debt Restructurings (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Contract
Dec. 31, 2013
Contract
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings at periods end, Number of Contracts 25 12
Troubled debt restructurings at period end, Recorded Investment $ 8,547 $ 7,535
Accruing [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings at periods end, Number of Contracts 13 6
Troubled debt restructurings at period end, Recorded Investment 6,104 5,988
Accruing [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings at periods end, Number of Contracts 1 1
Troubled debt restructurings at period end, Recorded Investment 194 200
Accruing [Member] | Commercial Real Estate [Member] | Non-Owner Occupied [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings at periods end, Number of Contracts 2 2
Troubled debt restructurings at period end, Recorded Investment 4,187 4,268
Accruing [Member] | Acquisition and Development [Member] | Commercial and Land Development [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings at periods end, Number of Contracts 2 2
Troubled debt restructurings at period end, Recorded Investment 921 1,071
Accruing [Member] | Residential Mortgage [Member] | First Lien [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings at periods end, Number of Contracts 8 1
Troubled debt restructurings at period end, Recorded Investment 803 449
Nonaccruing [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings at periods end, Number of Contracts 12 6
Troubled debt restructurings at period end, Recorded Investment 2,443 1,547
Nonaccruing [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings at periods end, Number of Contracts 1 1
Troubled debt restructurings at period end, Recorded Investment 56 71
Nonaccruing [Member] | Commercial Real Estate [Member] | Non-Owner Occupied [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings at periods end, Number of Contracts 1 1
Troubled debt restructurings at period end, Recorded Investment 657 694
Nonaccruing [Member] | Commercial Real Estate [Member] | Non-Owner Occupied Residential [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings at periods end, Number of Contracts 1 1
Troubled debt restructurings at period end, Recorded Investment 187 193
Nonaccruing [Member] | Commercial and Industrial [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings at periods end, Number of Contracts 1 2
Troubled debt restructurings at period end, Recorded Investment 105 310
Nonaccruing [Member] | Residential Mortgage [Member] | First Lien [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings at periods end, Number of Contracts 8 1
Troubled debt restructurings at period end, Recorded Investment $ 1,438 $ 279