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Repurchase Agreements - Narrative (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Disclosure of Repurchase Agreements [Abstract]
Repurchase agreements	$ 316,445,869	$ 103,941,174
Fair Value of securities pledged, including accrued interest receivable	334,216,000	109,863,000
Cash Held on Deposit with Repurchase Agreement Counterparties	$ 0	$ 449,000
Weighted Average Borrowing Rate	0.42%	0.49%

The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.

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