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Securities Sold Under Agreement to Repurchase (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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%

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- Definition Securities sold under agreements to repurchase maximum monthly outstanding amount. + References No definition available. + Details
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- Definition Securities sold under agreements to repurchase weighted average interest rate. + References No definition available. + Details
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- Definition Securities sold under agreements to repurchase weighted average interest rate during period. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 100 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 36 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 1 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7472769&loc=d3e9760-107771 + Details
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