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Note 12 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Financial Assets |  |
Securities held-to-maturity |  | $ 823,906
Securities available-for-sale | 2,018,305 | 1,291,480
Trading securities | 4,816 | 4,703
Estimate of Fair Value Measurement [Member] |  |
Financial Assets |  |
Cash and due from banks | 133,003 | 144,909
Short-term investments | 139,840 | 411,983
Securities held-to-maturity |  | 823,906
Securities available-for-sale | 2,018,305 | 1,291,480
Trading securities | 4,816 | 4,703
Loans, net | 7,418,305 | 7,169,732
Investment in Federal Home Loan Bank stock | 32,918 | 41,272
Warrants | 72 | 104
Financial Liabilities |  |
Deposits | 7,716,124 | 7,389,015
Securities sold under agreement to repurchase | 1,019,835 | 1,361,585
Advances from Federal Home Loan Bank | 126,310 | 146,789
Other borrowings | 14,680 | 14,573
Long-term debt | 97,375 | 98,392
Fair Value, Inputs, Level 1 [Member] |  |
Financial Assets |  |
Cash and due from banks | 133,003 | 144,909
Short-term investments | 139,840 | 411,983
Securities held-to-maturity |  | 0
Securities available-for-sale | 415,874 | 526,165
Trading securities | 0 | 0
Loans, net | 0 | 0
Investment in Federal Home Loan Bank stock | 0 | 0
Warrants | 0 | 0
Financial Liabilities |  |
Deposits | 0 | 0
Securities sold under agreement to repurchase | 0 | 0
Advances from Federal Home Loan Bank | 0 | 0
Other borrowings | 0 | 0
Long-term debt | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets |  |
Cash and due from banks | 0 | 0
Short-term investments | 0 | 0
Securities held-to-maturity |  | 823,906
Securities available-for-sale | 1,602,431 | 765,315
Trading securities | 4,703 | 4,703
Loans, net | 0 | 0
Investment in Federal Home Loan Bank stock | 32,918 | 41,272
Warrants | 0 | 0
Financial Liabilities |  |
Deposits | 0 | 0
Securities sold under agreement to repurchase | 1,019,835 | 1,361,585
Advances from Federal Home Loan Bank | 126,310 | 146,789
Other borrowings | 0 | 0
Long-term debt | 97,375 | 98,392
Fair Value, Inputs, Level 3 [Member] |  |
Financial Assets |  |
Cash and due from banks | 0 | 0
Short-term investments | 0 | 0
Securities held-to-maturity |  | 0
Securities available-for-sale | 0 | 0
Trading securities | 113 | 0
Loans, net | 7,418,305 | 7,169,732
Investment in Federal Home Loan Bank stock | 0 | 0
Warrants | 72 | 104
Financial Liabilities |  |
Deposits | 7,716,124 | 7,389,015
Securities sold under agreement to repurchase | 0 | 0
Advances from Federal Home Loan Bank | 0 | 0
Other borrowings | 14,680 | 14,573
Long-term debt | $ 0 | $ 0

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- Definition Other borrowings fair value disclosure. + References No definition available. + Details
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- Definition Warrants, Fair Value Disclosure + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits. + References No definition available. + Details
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- Definition Fair value portion of borrowing from Federal Home Loan Bank (FHLBank). + 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(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=29638263&loc=d3e39828-111592 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + 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 210.5-02.2) -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 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 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 210.9-03.4) -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 -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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