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Contractual Maturity Information Regarding Repurchase Agreements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets Sold Under Agreements To Repurchase [Line Items]
Balance, repurchase agreement	$ 15,759,831	$ 16,129,683
Weighted Average Contractual Rate	0.36%	0.37%
Within 30 days
Assets Sold Under Agreements To Repurchase [Line Items]
Balance, repurchase agreement	13,770,099	13,170,898
Weighted Average Contractual Rate	0.35%	0.37%
30 days to 3 months
Assets Sold Under Agreements To Repurchase [Line Items]
Balance, repurchase agreement	1,489,732	2,958,785
Weighted Average Contractual Rate	0.36%	0.40%
3 months to 36 months
Assets Sold Under Agreements To Repurchase [Line Items]
Balance, repurchase agreement	$ 500,000
Weighted Average Contractual Rate	0.53%

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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