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Short-Term Borrowings (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 511,418,000 | $ 568,505,000
Master Notes [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 411,907,000 | 399,047,000
Repurchase Agreements [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 96,960,000 | 111,907,000
Federal Home Loan Bank Advances [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 0 | 55,000,000
Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 2,551,000 | 2,551,000
Unsecured Debt [Member] |  |
Short-term Debt [Line Items] |  |
Line of Credit Facility, Remaining Borrowing Capacity | 665,000,000 |
Secured Debt [Member] |  |
Short-term Debt [Line Items] |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 1,140,000,000 |

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),16(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Subparagraph a(1) -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 + Details
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