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Note 3 - Investment Securities (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Proceeds from Sale of Debt Securities, Available-for-sale | $ 293,800 | $ 99,900 |
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale | 296,721 | 447,773 | $ 562,595
Debt Securities, Available-for-sale, Realized Gain | 583,000 | 36,000 |
Debt Securities, Available-for-sale, Realized Loss | $ 372,000 | 14,000 |
Temporarily Impaired Securities As Percentage Of Investment Securities | 34.00% |  |
Percentage Of Unrealized Losses For Securities With Unrealized Losses For Less Than Twelve Months | 0.20% |  |
Percentage Of Unrealized Losses For Securities With Unrealized Losses For Greater Than Twelve Months | 0.40% |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 1,740 | 27,000 |
Pledged Investment Securities | 20,100 | 28,500 |
Equity Securities, FV-NI, Unrealized Gain (Loss), Total | 5,736 | (2,787) | $ (0)
Equity Securities, FV-NI | $ 28,005 | 25,098 |
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 8,600 |

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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