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Note 6 - Investment Securities (Details Textual) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Available-for-sale Securities | $ 1,368,351,000 |  | $ 1,314,345,000 | [1]
Proceeds from Sale of Mortgage Backed Securities (MBS) categorized as Available-for-sale | 0 | $ 241,800,000 |  |
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS) | 28,600,000 | 80,700,000 |  |
Proceeds From Sales And Repayments Of Other Investment Securities | 99,500,000 | 0 |  |
Proceeds from Maturities Repayments and Calls of Other Investment Securities | 170,000,000 | 335,000,000 |  |
Realized Loss From Sale And Call Of Investment Securities | 438,000 |  |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | 25,000 | $ 206,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 8,717,000 |  | 14,968,000 |
Pledged Investment Securities | $ 225,600,000 |  | $ 649,100,000 |
[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 Pledged investment securities at carrying value. + References No definition available. + Details
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- Definition Proceeds from maturities repayments and calls of other investment securities. + References No definition available. + Details
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- Definition Proceeds From Sales and Repayments of Other Investment Securities + 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=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 Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284422-111562 + Details
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