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Repurchase Agreements - Maturities (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	$ 334,216,000	$ 109,863,000
Repurchase agreements	316,445,869	103,941,174
Weighted Average Borrowing Rate	0.42%	0.49%
[MaturityOvernightMember]
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	66,571,000	0
Repurchase agreements	63,381,000	0
Weighted Average Borrowing Rate	0.40%	0.00%
[MaturityUpTo30DaysMember]
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	250,670,000	109,863,000
Repurchase agreements	236,743,000	103,941,000
Weighted Average Borrowing Rate	0.42%	0.49%
[Maturity30To90DaysMember]
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	16,975,000	0
Repurchase agreements	16,322,000	0
Weighted Average Borrowing Rate	0.42%	0.00%
[MaturityOver90DaysMember]
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	0	0
Repurchase agreements	$ 0	$ 0
Weighted Average Borrowing Rate	0.00%	0.00%

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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