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Note 2 - Securities - Amortized Cost and Fair Value of Investments in Debt Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Securities available for sale, amortized cost $ 648,786 $ 679,111
Securities available for sale, unrealized gains 5 17
Securities available for sale, unrealized losses 62,384 71,066
Securities available for sale, fair value 586,407 608,062 [1]
US Treasury Securities [Member]    
Securities available for sale, amortized cost 151,957 152,033
Securities available for sale, unrealized gains 0 0
Securities available for sale, unrealized losses 10,405 12,606
Securities available for sale, fair value 141,552 139,427
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available for sale, amortized cost 89,934 90,363
Securities available for sale, unrealized gains 3 4
Securities available for sale, unrealized losses 5,664 7,019
Securities available for sale, fair value 84,273 83,348
Collateralized Mortgage-Backed Securities [Member]    
Securities available for sale, amortized cost 324,430 336,393
Securities available for sale, unrealized gains 2 1
Securities available for sale, unrealized losses 38,201 42,301
Securities available for sale, fair value 286,231 294,093
US States and Political Subdivisions Debt Securities [Member]    
Securities available for sale, amortized cost 51,164 69,023
Securities available for sale, unrealized gains 0 12
Securities available for sale, unrealized losses 4,255 5,312
Securities available for sale, fair value 46,909 63,723
Corporate Debt Securities [Member]    
Securities available for sale, amortized cost 31,301 31,299
Securities available for sale, unrealized gains 0 0
Securities available for sale, unrealized losses 3,859 3,828
Securities available for sale, fair value $ 27,442 $ 27,471
[1] Derived from audited consolidated financial statements