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Fair Value - Quantitative Information About Level 3 Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Corporate Notes and Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value |  | $ 1,980
Corporate Notes and Bonds [Member] | Constant Prepayment Rate [Member] | Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Input utilized one |  | 0.00%
Corporate Notes and Bonds [Member] | Probability of Default [Member] | Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Input utilized one |  | 0.00%
Corporate Notes and Bonds [Member] | Discount Rate [Member] | Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Input utilized one |  | 9.60%
Pooled Trust Preferred [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | $ 776 | $ 600
Pooled Trust Preferred [Member] | Collateral Default Rate [Member] | Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Input utilized two | 2% in 2013; 1.5% in 2014; 1.0% in 2015; 0.5% in 2016 and thereafter | 2% annually for 2 years; 0.36% thereafter
Pooled Trust Preferred [Member] | Yield [Member] | Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Input utilized one | 12.00% | 13.00%
Pooled Trust Preferred [Member] | Recovery Probability [Member] | Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Input utilized two |  | 10%, lagged 2 years
Pooled Trust Preferred [Member] | Prepayment Speed [Member] | Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Input utilized two | 6.7% constant prepayment rate in 2013; 2.0% constant prepayment rate in 2014 and thereafter |

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- Definition Input utilized two. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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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Balance Type: | debit
Period Type: | instant

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- Details
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