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Repurchase Agreements - Narrative (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Disclosure of Repurchase Agreements [Abstract]
Repurchase agreements, net	$ 150,294,174	$ 69,528,000
Repurchase Agreements Weighted Average Borrowing Rates	0.49%	0.43%
Fair Value of securities pledged, including accrued interest receivable	158,765,000	73,305,000
Cash Posted As Collateral	$ 600,000	$ 100,000

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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