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Note 4 - Investment Securities (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |
Proceeds from Sale of Mortgage Backed Securities (MBS) categorized as Available-for-sale | $ 648,000,000 | $ 698,500,000
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS) | 101,200,000 | 69,700,000
Proceeds from Sales and Repayments of Other Investment Securities | 385,200,000 | 160,500,000
Proceeds from Maturities Repayments and Calls of Other Investment Securities | 165,000,000 | 585,800,000
Realized Gain from Sale and Call of Other Investment Securities | 2,400,000 | 18,000,000
Realized Loss from Sale and Call of Other Investment Securities | 1,900,000 | 10,500,000
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | $ 3,900,000 | $ 800,000
Temporarily Impaired Securities As Percentage of Investment Securities | 92.00% |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Less Than Twelve Months | 1.00% |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Greater than Twelve Months | 3.30% |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | 7 | 22
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | 47 | 8
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 15,923,000 | $ 11,799,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | 0 |
Pledged Investment Securities | $ 449,600,000 | $ 591,300,000

X
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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