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Note 10 - Borrowed Funds (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule Of Long Term Securities Sold Under Agreements To Repurchase [Table Text Block] |
(Dollars in millions) |  | Fixed-to-floating |  |  | Floating-to-fixed |  |  | Total |
Rate type |  | Float Rate |  |  | Fixed Rate |  |  |  |
Rate index |  | 8% minus 3 month LIBOR |  |  |  |  |  |  |  |  |  |
Maximum rate |  |  | 3.79 | % |  |  | 3.53 | % |  |  | 3.50 | % |  |  | 3.50 | % |  |  | 3.53 | % |  |  | 3.25 | % |  |  |  |  |  |  |  |  |
Minimum rate |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  |  |  |  |  |  |  |
No. of agreements |  |  | 3 |  |  |  | 1 |  |  |  | 4 |  |  |  | 3 |  |  |  | 1 |  |  |  | 1 |  |  |  | 3 |  |  |  | 4 |  |  |  | 20 |
Amount |  | $ | 150.0 |  |  | $ | 50.0 |  |  | $ | 200.0 |  |  | $ | 150.0 |  |  | $ | 50.0 |  |  | $ | 50.0 |  |  | $ | 200.0 |  |  | $ | 200.0 |  |  | $ | 1,050.0 |
Weighted average rate |  |  | 3.78 | % |  |  | 3.53 | % |  |  | 3.50 | % |  |  | 3.50 | % |  |  | 3.53 | % |  |  | 3.25 | % |  |  | 4.69 | % |  |  | 5.00 | % |  |  | 4.04 | %
Final maturity |  |  | 2014 |  |  |  | 2014 |  |  |  | 2014 |  |  |  | 2015 |  |  |  | 2015 |  |  |  | 2015 |  |  |  | 2014 |  |  |  | 2017 |  |  |  |  |
Schedule of Repurchase Agreements [Table Text Block] |
Maturity |  | No. of Agreements |  |  | Amount (In thousands) |  |  | Weighted Average Interest Rate |
3 years to 5 years |  |  | 2 |  |  | $ | 100,000 |  |  |  | 2.71 | %
Over 5 years |  |  | 2 |  |  |  | 100,000 |  |  |  | 2.86 | %
Total |  |  | 4 |  |  | $ | 200,000 |  |  |  | 2.78 | %
Summary Of Comparative Data Of Securities Sold Under Agreements To Repurchase [Table Text Block] |
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | (Dollars in thousands) |
Average amount outstanding during the year (1) |  | $ | 1,361,475 |  |  | $ | 1,448,363 |  |  | $ | 1,560,215 |
Maximum amount outstanding at month-end (2) |  |  | 1,400,000 |  |  |  | 1,559,000 |  |  |  | 1,566,000 |
Balance, December 31 |  |  | 1,250,000 |  |  |  | 1,400,000 |  |  |  | 1,561,000 |
Rate, December 31 |  |  | 3.84 | % |  |  | 4.14 | % |  |  | 4.18 | %
Weighted average interest rate for the year |  |  | 4.09 | % |  |  | 4.19 | % |  |  | 4.24 | %
Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank [Table Text Block] |
|  | 2012 |  |  | 2011 |
Maturity |  | Amount (In thousands) |  |  | Weighted Average Interest Rate |  |  | Amount (In thousands) |  |  | Weighted Average Interest Rate |
Within 90 days |  | $ | 125,000 |  |  |  | 0.28 | % |  | $ | - |  |  |  | 0.00 | %
91 days through 365 days |  |  | - |  |  |  | 0.00 | % |  |  | 225,000 |  |  |  | 2.08 | %
4 - 5 years |  |  | 21,200 |  |  |  | 1.38 | % |  |  | - |  |  |  | - |
|  | $ | 146,200 |  |  |  | 0.44 | % |  | $ | 225,000 |  |  |  | 2.08 | %

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- Definition Tabular disclosure of advances by federal home loan bank by branch. + 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 210.9-03.13,16) -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 17, 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 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 Reference 5: 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 6: 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 + Details
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