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Repurchase Agreements - Narrative (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Repurchase Agreement [Line Items]
Repurchase agreements	$ 346,197,338	$ 150,294,174
Repurchase Agreements Weighted Average Borrowing Rates	0.39%	0.49%
Fair Value of securities pledged, including accrued interest receivable	357,199,000	158,765,000
Repurchase Agreement Margin	6,629,000	614,000
[VariableInterestEntityPrimaryBeneficiaryMember]
Repurchase Agreement [Line Items]
Repurchase agreements	$ 308,735,338	$ 0

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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