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Securities Sold Under Agreements to Repurchase and Overnight Borrowings (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
At December 31:
Outstanding balance	$ 16,134	$ 18,074
Average interest rate	0.20%	0.24%
Daily average for the year:
Outstanding balance	17,026	16,162
Average interest rate	0.22%	0.32%
Maximum outstanding at any month end	$ 18,439	$ 18,074

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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