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Derivative Instruments and Hedging Activities Schedule of Interest Rate Swap Receivers Associated with the Investment Portfolio (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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|---|---|---|---|---|---|---|
| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | $ 43,379,217 | $ 43,576,146 | $ 37,366,610 | $ 44,262,605 | $ 27,041,328 | $ 22,377,656 |
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Interest Rate Swap [Member]
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| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | 23,628,148 | 21,663,148 | 19,619,000 | 18,485,000 | 16,685,000 | 14,070,000 |
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Interest Rate Risk Associated with the Investment Portfolio [Member] | Interest Rate Swap [Member] | Short [Member]
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| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | 3,098,148 | 2,154,000 | ||||
| Derivative, Average Variable Interest Rate | 2.292% | 2.337% | ||||
| Derivative, Average Fixed Interest Rate | 0.23% | 0.24% | ||||
| Derivative, Average Remaining Period Until Maturity | 7.08 | 7.84 | ||||
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Interest Rate Risk Associated with the Investment Portfolio [Member] | Derivative Maturity Within One Year From Balance Sheet Date [Member] | Interest Rate Swap [Member] | Short [Member]
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| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | ||||||
| Derivative, Average Variable Interest Rate | ||||||
| Derivative, Average Fixed Interest Rate | ||||||
| Derivative, Average Remaining Period Until Maturity | 0.00 | 0.00 | ||||
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Interest Rate Risk Associated with the Investment Portfolio [Member] | Derivative Maturity Over One And Within Two Years From Balance Sheet Date [Member] | Interest Rate Swap [Member] | Short [Member]
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| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | ||||||
| Derivative, Average Variable Interest Rate | ||||||
| Derivative, Average Fixed Interest Rate | ||||||
| Derivative, Average Remaining Period Until Maturity | 0.00 | 0.00 | ||||
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Interest Rate Risk Associated with the Investment Portfolio [Member] | Derivative Maturity Over Two And Within Three Years From Balance Sheet Date [Member] | Interest Rate Swap [Member] | Short [Member]
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| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | ||||||
| Derivative, Average Variable Interest Rate | ||||||
| Derivative, Average Fixed Interest Rate | ||||||
| Derivative, Average Remaining Period Until Maturity | 0.00 | 0.00 | ||||
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Interest Rate Risk Associated with the Investment Portfolio [Member] | Derivative Maturity Over Three And Within Four Years From Balance Sheet Date [Member] | Interest Rate Swap [Member] | Short [Member]
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| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | 575,000 | |||||
| Derivative, Average Variable Interest Rate | 1.44% | |||||
| Derivative, Average Fixed Interest Rate | 0.227% | |||||
| Derivative, Average Remaining Period Until Maturity | 4.39 | 0.00 | ||||
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Interest Rate Risk Associated with the Investment Portfolio [Member] | Derivative Maturity Over Four Years From Balance Sheet Date [Member] | Interest Rate Swap [Member] | Short [Member]
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| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | $ 2,523,148 | $ 2,154,000 | ||||
| Derivative, Average Variable Interest Rate | 2.487% | 2.337% | ||||
| Derivative, Average Fixed Interest Rate | 0.231% | 0.24% | ||||
| Derivative, Average Remaining Period Until Maturity | 7.70 | 7.84 |