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Short-Term Borrowings - Schedule of Short-Term Borrowings (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Short-term Debt [Line Items] |  |
Securities sold under agreements to repurchase and federal funds purchased | $ 244,168 | $ 240,594
Federal Home Loan Bank advances | 100,000 | 23,000
Total short-term borrowings | 344,168 | 263,594
Repurchase agreements and Federal Funds Purchased |  |
Short-term Debt [Line Items] |  |
Total short-term borrowings | 244,168 | 240,594
Highest month-end balance | 302,946 | 265,412
Average daily balance | 257,341 | 246,145
Weighted-average interest rate: |  |
As of year-end | 0.23% | 0.29%
Paid during the year | 0.26% | 0.30%
Federal Home Loan Bank Advances |  |
Short-term Debt [Line Items] |  |
Total short-term borrowings | 100,000 | 23,000
Highest month-end balance | 100,000 | 232,000
Average daily balance | 1,320 | 51,392
Weighted-average interest rate: |  |
As of year-end | 0.38% | 0.04%
Paid during the year | 0.28% | 0.18%
Demand Notes Due U.S. Treasury and Other |  |
Short-term Debt [Line Items] |  |
Total short-term borrowings | 0 | 0
Highest month-end balance | 0 | 0
Average daily balance | $ 0 | $ 0
Weighted-average interest rate: |  |
As of year-end | 0.00% | 0.00%
Paid during the year | 0.00% | 0.00%

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- Definition Federal Home Loan Bank borrowings due within one year of the latest balance sheet date. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 37 -IssueDate 2006-05-01 -Chapter 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph f -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 15, 18 -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. + Details
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