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Note 10 - Borrowed Funds (Detail) - Comparative Data for Securities Sold Under Agreements to Repurchase (Securities Sold under Agreements to Repurchase [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Securities Sold under Agreements to Repurchase [Member] |  |  |  |  |  |
Average amount outstanding during the year (1) | $ 1,361,475 | [1] | $ 1,448,363 | [1] | $ 1,560,215 | [1]
Maximum amount outstanding at month-end (2) | 1,400,000 | [2] | 1,559,000 | [2] | 1,566,000 | [2]
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% |
[1] | Average balances were computed using daily averages.
[2] | Highest month-end balances were January 2012, January 2011, September 2010, and February 2009.

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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 Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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- Definition The effective interest rate at the end of the reporting period. + 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 Maximum month-end amount borrowed under the credit facility during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section VII -Subsection 2 + Details
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