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Note 2 - Securities - Amortized Cost and Fair Value of Investments in Debt Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Securities available for sale, amortized cost $ 715,437 $ 694,639
Securities available for sale, unrealized gains 8 5,086
Securities available for sale, unrealized losses 73,561 7,258
Securities available for sale, fair value 641,884 692,467 [1]
US Treasury Securities [Member]    
Securities available for sale, amortized cost 152,109 150,751
Securities available for sale, unrealized gains 0 0
Securities available for sale, unrealized losses 13,572 1,174
Securities available for sale, fair value 138,537 149,577
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available for sale, amortized cost 111,958 104,518
Securities available for sale, unrealized gains 5 993
Securities available for sale, unrealized losses 7,298 931
Securities available for sale, fair value 104,665 104,580
Collateralized Mortgage-Backed Securities [Member]    
Securities available for sale, amortized cost 349,703 357,981
Securities available for sale, unrealized gains 2 2,854
Securities available for sale, unrealized losses 43,640 4,525
Securities available for sale, fair value 306,065 356,310
US States and Political Subdivisions Debt Securities [Member]    
Securities available for sale, amortized cost 70,373 65,939
Securities available for sale, unrealized gains 1 1,021
Securities available for sale, unrealized losses 5,767 488
Securities available for sale, fair value 64,607 66,472
Corporate Debt Securities [Member]    
Securities available for sale, amortized cost 31,294 15,450
Securities available for sale, unrealized gains 0 218
Securities available for sale, unrealized losses 3,284 140
Securities available for sale, fair value $ 28,010 $ 15,528
[1] Derived from audited consolidated financial statements