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Securities Sold Under Agreement to Repurchase (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Daily securities under agreement to repurchase
Amount Outstanding at End of Period	$ 51,312	$ 52,440
Daily Securities [Member]
Daily securities under agreement to repurchase
Amount Outstanding at End of Period	35,173	38,209	37,191
Weighted Average Rate End of Period	0.10%	0.15%	0.36%
Maximum Amount Borrowings Outstanding Month End	41,876	42,154	37,501
Approximate Average Outstanding in Period	38,725	36,910	34,046
Approximate Weighted Average Interest Rate For the Period	0.18%	0.30%	0.36%
Certificates of deposit [Member]
Daily securities under agreement to repurchase
Amount Outstanding at End of Period	16,139	14,231	14,050
Weighted Average Rate End of Period	1.25%	1.28%	1.28%
Maximum Amount Borrowings Outstanding Month End	16,139	15,095	14,050
Approximate Average Outstanding in Period	$ 14,184	$ 14,606	$ 12,493
Approximate Weighted Average Interest Rate For the Period	1.22%	1.25%	1.24%

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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