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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, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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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, 2014
Minimum [Member]
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Sep. 30, 2014
Maximum [Member]
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Sep. 30, 2014
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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Dec. 31, 2013
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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Sep. 30, 2014
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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Dec. 31, 2013
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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Sep. 30, 2014
Zero Coupon Municipal Bond [Member]
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Dec. 31, 2013
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 | $ 718,000 | $ 748,000 | ||||||||||||
| Tax credits to be received | 5 months 23 days | |||||||||||||
| Loans held for sale | 7,757,000 | 7,757,000 | 3,842,000 | 5,228,000 | 2,553,000 | 8,306,000 | 0 | 0 | 7,800,000 | 0 | ||||
| Impaired loans, description | Nonaccrual Non-PCI loans with an unpaid principal balance over $100,000 and all performing restructured loans are reviewed individually for the amount of impairment, if any. Nonaccrual Non-PCI loans with an unpaid principal balance of $100,000 or less are evaluated for impairment collectively. | |||||||||||||
| Unpaid principal balance of Non-accrual Non-PCI loans reviewed individually for amount of impairment | 100,000 | |||||||||||||
| Unpaid principal balance of Non-accrual Non-PCI loans reviewed collectively for amount of impairment | 100,000 | |||||||||||||
| Transfers of assets between Level 1 and Level 2 of fair value hierarchy | $ 0 | |||||||||||||