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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | $ 400,815 | $ 451,060
Stock Warrants | 5 | 906
Total debt securities available-for-sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 400,076 | 450,668
Financial services industry [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 739 | 392
Equity securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 739 | 392
Mortgage-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 124,618 | 160,326
Collateralized mortgage obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 84,848 | 100,487
U.S. government agency securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 97,604 | 93,118
Municipal bonds-tax exempt [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 10,651 | 12,812
Municipal bonds-taxable [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 45,546 | 46,142
Corporate bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 20,375 | 20,400
SBA loan pools securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 13,501 | 14,026
Other securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 2,933 | 3,357
Recurring Basis (Member] | Quoted Prices in Active Markets for Identical Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 98,343 | 93,510
Stock Warrants |  |
Recurring Basis (Member] | Quoted Prices in Active Markets for Identical Assets [Member] | Total debt securities available-for-sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 97,604 | 93,118
Recurring Basis (Member] | Quoted Prices in Active Markets for Identical Assets [Member] | Financial services industry [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 739 | 392
Recurring Basis (Member] | Quoted Prices in Active Markets for Identical Assets [Member] | Equity securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 739 | 392
Recurring Basis (Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 301,710 | 356,771
Stock Warrants |  |
Recurring Basis (Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Total debt securities available-for-sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 301,710 | 356,771
Recurring Basis (Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Financial services industry [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Equity securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | Significant Unobservable Inputs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 762 | 779
Stock Warrants | 5 | 906
Recurring Basis (Member] | Significant Unobservable Inputs [Member] | Total debt securities available-for-sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 762 | 779
Recurring Basis (Member] | Significant Unobservable Inputs [Member] | Financial services industry [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | Significant Unobservable Inputs [Member] | Equity securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | Mortgage-backed securities [Member] | Quoted Prices in Active Markets for Identical Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | Mortgage-backed securities [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 124,618 | 160,326
Recurring Basis (Member] | Mortgage-backed securities [Member] | Significant Unobservable Inputs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | Collateralized mortgage obligations [Member] | Quoted Prices in Active Markets for Identical Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | Collateralized mortgage obligations [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 84,848 | 100,487
Recurring Basis (Member] | Collateralized mortgage obligations [Member] | Significant Unobservable Inputs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | U.S. government agency securities [Member] | Quoted Prices in Active Markets for Identical Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 97,604 | 93,118
Recurring Basis (Member] | U.S. government agency securities [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | U.S. government agency securities [Member] | Significant Unobservable Inputs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | Municipal bonds-tax exempt [Member] | Quoted Prices in Active Markets for Identical Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | Municipal bonds-tax exempt [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 9,889 | 12,033
Recurring Basis (Member] | Municipal bonds-tax exempt [Member] | Significant Unobservable Inputs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 762 | 779
Recurring Basis (Member] | Municipal bonds-taxable [Member] | Quoted Prices in Active Markets for Identical Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | Municipal bonds-taxable [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 45,546 | 46,142
Recurring Basis (Member] | Municipal bonds-taxable [Member] | Significant Unobservable Inputs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | Corporate bonds [Member] | Quoted Prices in Active Markets for Identical Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | Corporate bonds [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 20,375 | 20,400
Recurring Basis (Member] | Corporate bonds [Member] | Significant Unobservable Inputs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | SBA loan pools securities [Member] | Quoted Prices in Active Markets for Identical Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | SBA loan pools securities [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 13,501 | 14,026
Recurring Basis (Member] | SBA loan pools securities [Member] | Significant Unobservable Inputs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | Other securities [Member] | Quoted Prices in Active Markets for Identical Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |
Recurring Basis (Member] | Other securities [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales | 2,933 | 3,357
Recurring Basis (Member] | Other securities [Member] | Significant Unobservable Inputs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available-for-sales |  |

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- Definition Fair value portion of warrants not settleable in cash classified as equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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