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Note 12 - Fair Value of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Short-term investments | $ 393,895 | $ 967,067 |
Available-for-sale Securities | 1,368,351 | 1,314,345 | [1]
Loans held-for-sale |  | 7,500 |
Loans, net | 11,379,583 | 11,006,344 |
Investment in Federal Home Loan Bank stock | 17,250 | 17,250 |
Warrants | 108 | 79 |
Deposits | 11,470,912 | 11,680,017 |
Securities sold under agreements to repurchase | 150,842 | 351,989 |
Advances from Federal Home Loan Bank | 475,058 | 350,062 |
Other borrowings | 15,570 | 15,944 |
Long-term debt | 63,337 | 63,169 |
Cash and due from banks | 160,517 | 218,017 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Short-term investments | 393,895 | 967,067 |
Available-for-sale Securities | 591,403 | 513,376 | [1]
Loans held-for-sale |  |  |
Loans, net |  |  |
Investment in Federal Home Loan Bank stock |  |  |
Warrants |  |  |
Deposits |  |  |
Securities sold under agreements to repurchase |  |  |
Advances from Federal Home Loan Bank |  |  |
Other borrowings |  |  |
Long-term debt |  |  |
Cash and due from banks | 160,517 | 218,017 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Short-term investments |  |  |
Available-for-sale Securities | 776,948 | 800,969 | [1]
Loans held-for-sale |  |  |
Loans, net |  |  |
Investment in Federal Home Loan Bank stock | 17,250 | 17,250 |
Warrants |  |  |
Deposits |  |  |
Securities sold under agreements to repurchase | 150,842 | 351,989 |
Advances from Federal Home Loan Bank | 475,058 | 350,062 |
Other borrowings |  |  |
Long-term debt | 63,337 | 63,169 |
Cash and due from banks |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Short-term investments |  |  |
Available-for-sale Securities |  |  | [1]
Loans held-for-sale |  | 7,500 |
Loans, net | 11,379,583 | 11,006,344 |
Investment in Federal Home Loan Bank stock |  |  |
Warrants | 108 | 79 |
Deposits | 11,470,912 | 11,680,017 |
Securities sold under agreements to repurchase |  |  |
Advances from Federal Home Loan Bank |  |  |
Other borrowings | 15,570 | 15,944 |
Long-term debt |  |  |
Cash and due from banks |  |  |
[1] | Preferred stock of government sponsored entities and other equity securities as of December 31, 2015 were reclassified as level 1 rather than level 2 as originally classified due to the availability of quoted prices in active markets.

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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=75030427&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=82897076&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=82896770&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 No definition available. + Details
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