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Note 2 - Investment Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Securities available-for-sale, amortized cost | $ 1,195,721 | $ 1,297,977
Securities available-for-sale, unrealized gains | 184 | 349
Securities available-for-sale, unrealized losses | (175,657) | (153,709)
Securities available-for-sale, fair value | 1,020,248 | 1,144,617
US Treasury Securities and US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, amortized cost | 123,500 | 122,966
Securities available-for-sale, unrealized gains | 0 | 0
Securities available-for-sale, unrealized losses | (5,491) | (7,927)
Securities available-for-sale, fair value | 118,009 | 115,039
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale, amortized cost | 115,862 | 149,773
Securities available-for-sale, unrealized gains | 184 | 290
Securities available-for-sale, unrealized losses | (6,813) | (6,437)
Securities available-for-sale, fair value | 109,233 | 143,626
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities available-for-sale, amortized cost | 814,224 | 874,265
Securities available-for-sale, unrealized gains | 0 | 58
Securities available-for-sale, unrealized losses | (141,558) | (121,585)
Securities available-for-sale, fair value | 672,666 | 752,738
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, amortized cost | 138,279 | 145,016
Securities available-for-sale, unrealized gains | 0 | 1
Securities available-for-sale, unrealized losses | (21,388) | (17,418)
Securities available-for-sale, fair value | 116,891 | 127,599
Other Debt Obligations [Member] |  |
Securities available-for-sale, amortized cost | 3,856 | 5,957
Securities available-for-sale, unrealized gains | 0 | 0
Securities available-for-sale, unrealized losses | (407) | (342)
Securities available-for-sale, fair value | $ 3,449 | $ 5,615

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- Definition Amount, before tax, of unrealized gain 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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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