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Note 3 - Investment Securities (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Proceeds from Sale of Debt Securities, Available-for-sale | $ 21,102 | $ 117,249 | $ 293,849
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale | 424,386 | 734,485 | $ 296,721
Debt Securities, Available-for-sale, Realized Gain | 853 | 1,700 |
Debt Securities, Available-for-sale, Realized Loss | 0 | 0 |
Pledged Investment Securities | 30,500 | 22,700 |
Equity Securities, Net Realized Loss From Decrease in Fair Value | 1,400 | 1,100 |
Equity Securities, FV-NI, Current | $ 22,319 | $ 23,744 |

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- Definition Amount of realized gain 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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