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Fair Value Measurements - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | |||||
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Jun. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||||
| Tax credits to be received | 8 months 27 days | ||||||
| Loans held for sale | $ 3,842,000 | $ 3,842,000 | $ 390,000 | $ 0 | $ 2,553,000 | $ 6,043,000 | $ 8,306,000 |
| Transfers of assets between Level 1 and Level 2 of fair value hierarchy | 0 | ||||||
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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 | 3,800,000 | 3,800,000 | 0 | ||||
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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 | 0 | 0 | ||||
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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 | $ 728,000 | $ 728,000 | $ 748,000 |