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Note 8 - Investment Securities (Details Textual) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($)
Interest Receivable | $ 60,056 |  | $ 56,994
Equity Securities, FV-NI, Unrealized Gain (Loss), Total | 5,874 | $ (2,752) |
Equity Securities, FV-NI, Current | $ 27,740 |  | $ 22,319
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 156 |  | 88
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance | $ 0 | $ 0 |
Pledged Investment Securities | $ 28,800 |  | $ 30,500
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 135 |  | 70
Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 14 |  | 12
Debt Securities, Available-for-sale [Member] |  |  |
Interest Receivable | $ 2,900 |  |

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- Definition Amount of allowance for credit loss 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 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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