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Fair Value Measurements - Additional Information (Detail) (USD $)
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3 Months Ended |
9 Months Ended |
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Provisions for loan losses |
$ 100,000 |
$ 350,000 |
$ 575,000 |
$ 1,125,000 |
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Impaired Loans
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Provisions for loan losses |
284,000 |
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329,000 |
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Impaired Loans | Level 3 | Minimum
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value measurement, discount rate |
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10.00% |
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| Fair value measurement, estimated costs to sell the collateral |
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10.00% |
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Impaired Loans | Level 3 | Maximum
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value measurement, discount rate |
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20.00% |
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| Fair value measurement, estimated costs to sell the collateral |
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15.00% |
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Foreclosed Real Estate
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Foreclosed real estate write down charges |
$ 10,000 |
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$ 32,000 |
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Foreclosed Real Estate | Level 3 | Minimum
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value measurement, discount rate |
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10.00% |
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| Fair value measurement, estimated costs to sell the collateral |
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10.00% |
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Foreclosed Real Estate | Level 3 | Maximum
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value measurement, discount rate |
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20.00% |
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| Fair value measurement, estimated costs to sell the collateral |
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15.00% |
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