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Note 4 - Investment Securities (Details Textual) | 12 Months Ended |
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2018 USD ($)
Proceeds from Sale of Mortgage-backed Securities (MBS), Available-for-sale | $ 0 | $ 0 |  |
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS) | 105,900,000 | 71,600,000 |  |
Proceeds From Sales And Repayments Of Other Investment Securities | 99,900,000 | 111,700,000 |  |
Proceeds from Maturities Repayments and Calls of Other Investment Securities | 341,900,000 | 491,000,000 |  |
Realized Gain From Sale And Call Of Investment Securities | 36,000 | 1,700,000 |  |
Realized Loss From Sale And Call Of Investment Securities | $ 14,000 | $ 710,000 |  |
Temporarily Impaired Securities As Percentage Of Investment Securities | 84.90% |  |  |
Percentage Of Unrealized Losses For Securities With Unrealized Losses For Less Than Twelve Months | 0.40% |  |  |
Percentage Of Unrealized Losses For Securities With Unrealized Losses For Greater Than Twelve Months | 2.80% |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | 90 | 24 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | 14 | 63 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax, Total | $ 27,000,000 |  |  |
Pledged Investment Securities | 28,500,000 | $ 272,200,000 |  |
Equity Securities, FV-NI, Unrealized Gain (Loss), Total | (2,787,000) |  |  |
Equity Securities, FV-NI | 25,098,000 | $ 28,100,000 |  |
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 8,600,000 |  |  | $ 8,600,000

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