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Loans Receivable and Allowance for Loan Losses - Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 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 | $ 4,153 | $ 7,535
Accruing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings at periods end, Number of Contracts | 10 | 6
Troubled debt restructurings at period end, Recorded Investment | 1,735 | 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 | 0 | 1
Troubled debt restructurings at period end, Recorded Investment | 0 | 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 | 0 | 2
Troubled debt restructurings at period end, Recorded Investment | 0 | 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 | 917 | 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 | 818 | 449
Nonaccruing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings at periods end, Number of Contracts | 15 | 6
Troubled debt restructurings at period end, Recorded Investment | 2,418 | 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 | 49 | 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 | 686 | 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 | 0 | 1
Troubled debt restructurings at period end, Recorded Investment | 0 | 193
Nonaccruing [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings at periods end, Number of Contracts | 0 | 2
Troubled debt restructurings at period end, Recorded Investment | 0 | 310
Nonaccruing [Member] | Residential Mortgage [Member] | First Lien [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings at periods end, Number of Contracts | 12 | 1
Troubled debt restructurings at period end, Recorded Investment | 1,669 | 279
Nonaccruing [Member] | Residential Mortgage [Member] | Consumer Loan [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings at periods end, Number of Contracts | 1 | 0
Troubled debt restructurings at period end, Recorded Investment | $ 14 | $ 0

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