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Fair Value Measurements - Additional Information (Detail) (USD $)
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9 Months Ended | |||||
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Sep. 30, 2013
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Jun. 30, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Dec. 31, 2011
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||
| Tax credit to be received | 1 year 6 months | |||||
| Percentage of decline in bond value | 0.70% | |||||
| Loans held for sale | $ 5,228,000 | $ 2,553,000 | $ 8,306,000 | $ 10,736,000 | $ 5,138,000 | $ 22,587,000 |
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Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Non-recurring Basis [Member] | Non-Performing Loans Held for Sale [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||
| Loans held for sale | 0 | 484,000 | ||||
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Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Non-recurring Basis [Member] | Small Business Administration Loans Held for Sale [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||
| Loans held for sale | 5,200,000 | 7,800,000 | ||||
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Zero Coupon Municipal Bond [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||
| Zero coupon tax credit municipal bond, recorded at estimated fair value | $ 756,000 | $ 779,000 |