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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, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | $ 505,977 | $ 530,926
Stock warrants |  | 2
Mortgage-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 214,635 | 217,059
U.S. government agency securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 77,864 | 83,536
Corporate bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 16,925 | 20,835
Other securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 2,939 | 2,886
Equity security [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 250 |
U.S. treasury bills [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale |  | 19,997
Collateralized mortgage obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 159,625 | 127,693
Municipal bonds-tax exempt [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 4,447 | 13,937
Municipal bonds-taxable [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 16,731 | 32,354
SBA loan pools securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 12,561 | 12,629
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 sale | 77,864 | 103,533
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets [Member] | U.S. government agency securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 77,864 | 83,536
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets [Member] | U.S. treasury bills [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale |  | 19,997
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 sale | 427,385 | 426,645
Recurring Basis [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Mortgage-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 214,635 | 217,059
Recurring Basis [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Corporate bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 16,925 | 20,835
Recurring Basis [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Other securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 2,939 | 2,886
Recurring Basis [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Equity security [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 250 |
Recurring Basis [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Collateralized mortgage obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 159,625 | 127,693
Recurring Basis [Member] | Significant Unobservable Inputs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 728 | 748
Stock warrants |  | 2
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 sale | 3,719 | 13,189
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 sale | 728 | 748
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 sale | 16,731 | 32,354
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 sale | $ 12,561 | $ 12,629

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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=36462937&loc=d3e19207-110258 + Details
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