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Note 5 - Debt Securities - Summary of Amortized Cost and Fair Value of Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt securities, available for sale, amortized cost $ 532,250 $ 541,196
Available for sale securities, unrealized gains 591 1,534
Available for sale securities, unrealized losses 42,570 39,968
Debt securities available for sale (at fair value) 490,271 502,762 [1]
US Government Corporations and Agencies Securities [Member]    
Debt securities, available for sale, amortized cost 22,116 23,295
Available for sale securities, unrealized gains 33 38
Available for sale securities, unrealized losses 646 508
Debt securities available for sale (at fair value) 21,503 22,825
Government Sponsored Agencies [Member]    
Debt securities, available for sale, amortized cost 129,634 133,709
Available for sale securities, unrealized gains 133 729
Available for sale securities, unrealized losses 6,648 4,871
Debt securities available for sale (at fair value) 123,119 129,567
Nongovernment Sponsored Agencies [Member]    
Debt securities, available for sale, amortized cost 78,023 78,350
Available for sale securities, unrealized gains 137 22
Available for sale securities, unrealized losses 4,304 4,503
Debt securities available for sale (at fair value) 73,856 73,869
Taxable State and Political Subdivisions General Obligations [Member]    
Debt securities, available for sale, amortized cost 80,334 79,323
Available for sale securities, unrealized gains 12 3
Available for sale securities, unrealized losses 14,978 14,995
Debt securities available for sale (at fair value) 65,368 64,331
Taxable State and Political Subdivisions Various Tax Revenues [Member]    
Debt securities, available for sale, amortized cost 10,657 10,665
Available for sale securities, unrealized gains 0 0
Available for sale securities, unrealized losses 2,052 2,107
Debt securities available for sale (at fair value) 8,605 8,558
Taxable State and Political Subdivisions Other Revenues [Member]    
Debt securities, available for sale, amortized cost 26,816 26,822
Available for sale securities, unrealized gains 0 0
Available for sale securities, unrealized losses 4,797 4,782
Debt securities available for sale (at fair value) 22,019 22,040
Corporate Debt Securities [Member]    
Debt securities, available for sale, amortized cost 38,201 39,618
Available for sale securities, unrealized gains 39 52
Available for sale securities, unrealized losses 1,651 1,763
Debt securities available for sale (at fair value) 36,589 37,907
Asset-Backed Securities [Member]    
Debt securities, available for sale, amortized cost 41,287 44,388
Available for sale securities, unrealized gains 133 81
Available for sale securities, unrealized losses 70 264
Debt securities available for sale (at fair value) 41,350 44,205
Taxable Debt Securities [Member]    
Debt securities, available for sale, amortized cost 427,068 436,170
Available for sale securities, unrealized gains 487 925
Available for sale securities, unrealized losses 35,146 33,793
Debt securities available for sale (at fair value) 392,409 403,302
Tax Exempt State and Political Subdivisions General Obligations [Member]    
Debt securities, available for sale, amortized cost 80,408 80,144
Available for sale securities, unrealized gains 100 581
Available for sale securities, unrealized losses 4,699 3,716
Debt securities available for sale (at fair value) 75,809 77,009
Tax Exempt State and Political Subdivisions Other Revenues [Member]    
Debt securities, available for sale, amortized cost 24,774 24,882
Available for sale securities, unrealized gains 4 28
Available for sale securities, unrealized losses 2,725 2,459
Debt securities available for sale (at fair value) 22,053 22,451
Tax Exempt Debt Securities [Member]    
Debt securities, available for sale, amortized cost 105,182 105,026
Available for sale securities, unrealized gains 104 609
Available for sale securities, unrealized losses 7,424 6,175
Debt securities available for sale (at fair value) $ 97,862 $ 99,460
[1] Derived from audited consolidated financial statements.