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Derivative Instruments (Details) (USD $) | 6 Months Ended | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Dec. 31, 2008 | Dec. 31, 2013 derivative_instrument | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Interest Rate Floor [Member] | Dec. 31, 2013 Cash Flow Hedging [Member] Interest Rate Floor [Member]
Derivative [Line Items] |  |  |  |  |  |  |
Interest rate floors notional value |  |  |  |  |  | $ 600,000,000 | $ 500,000,000
Number of derivatives designated as cash flow hedges |  |  | 7 |  |  |  |
Portfolio of variable-rate loans |  |  | 500,000,000 |  |  |  |
Interest rate floors maturity date |  |  |  | Jun. 30, 2011 | May 01, 2008 |  |
Strike rate, lower range |  |  | 6.00% |  |  |  |
Strike rate, higher range |  |  | 8.00% |  |  |  |
Interest rate floors matured |  | 150,000,000 |  |  |  |  |
Notional value of interest rate floors sold |  | 450,000,000 |  |  |  |  |
Gain on sale of derivatives | $ 16,800,000 |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of increase in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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