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Note 4 - Investment Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Securities available-for-sale, amortized cost | $ 1,297,977 | $ 1,190,379
Securities available-for-sale, unrealized gains | 349 | 5,281
Securities available-for-sale, unrealized losses | (153,709) | (15,362)
Securities available-for-sale, fair value | 1,144,617 | 1,180,298
US Treasury Securities and US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, amortized cost | 122,966 | 123,753
Securities available-for-sale, unrealized gains | 0 | 0
Securities available-for-sale, unrealized losses | (7,927) | (1,252)
Securities available-for-sale, fair value | 115,039 | 122,501
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale, amortized cost | 149,773 | 132,760
Securities available-for-sale, unrealized gains | 290 | 2,497
Securities available-for-sale, unrealized losses | (6,437) | (236)
Securities available-for-sale, fair value | 143,626 | 135,021
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities available-for-sale, amortized cost | 874,265 | 857,283
Securities available-for-sale, unrealized gains | 58 | 2,495
Securities available-for-sale, unrealized losses | (121,585) | (13,154)
Securities available-for-sale, fair value | 752,738 | 846,624
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, amortized cost | 145,016 | 75,488
Securities available-for-sale, unrealized gains | 1 | 289
Securities available-for-sale, unrealized losses | (17,418) | (702)
Securities available-for-sale, fair value | 127,599 | 75,075
Other Debt Obligations [Member] |  |
Securities available-for-sale, amortized cost | 5,957 | 1,095
Securities available-for-sale, unrealized gains | 0 | 0
Securities available-for-sale, unrealized losses | (342) | (18)
Securities available-for-sale, fair value | $ 5,615 | $ 1,077

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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