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Repurchase Agreements - Narrative (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Disclosure of Repurchase Agreements [Abstract]
Repurchase agreements	$ 651,246,345	$ 318,557,054
Fair Value of securities pledged, including accrued interest receivable	691,666,000	336,998,000
Cash Held on Deposit with Repurchase Agreement Counterparties	583,000	0
Weighted Average Borrowing Rate	0.35%	0.39%
Maximum Amount at Risk	$ 40,900,000

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

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