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Note 2 - Securities - Amortized Cost and Fair Value of Investments in Debt Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Securities available for sale, amortized cost $ 719,209 $ 694,639
Securities available for sale, unrealized gains 774 5,086
Securities available for sale, unrealized losses 33,807 7,258
Securities available for sale, fair value 686,176 692,467 [1]
US Treasury Securities [Member]    
Securities available for sale, amortized cost 152,260 150,751
Securities available for sale, unrealized gains 0 0
Securities available for sale, unrealized losses 7,425 1,174
Securities available for sale, fair value 144,835 149,577
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available for sale, amortized cost 107,000 104,518
Securities available for sale, unrealized gains 279 993
Securities available for sale, unrealized losses 3,432 931
Securities available for sale, fair value 103,847 104,580
Collateralized Mortgage-Backed Securities [Member]    
Securities available for sale, amortized cost 362,605 357,981
Securities available for sale, unrealized gains 216 2,854
Securities available for sale, unrealized losses 19,833 4,525
Securities available for sale, fair value 342,988 356,310
US States and Political Subdivisions Debt Securities [Member]    
Securities available for sale, amortized cost 67,894 65,939
Securities available for sale, unrealized gains 179 1,021
Securities available for sale, unrealized losses 2,396 488
Securities available for sale, fair value 65,677 66,472
Corporate Debt Securities [Member]    
Securities available for sale, amortized cost 29,450 15,450
Securities available for sale, unrealized gains 100 218
Securities available for sale, unrealized losses 721 140
Securities available for sale, fair value $ 28,829 $ 15,528
[1] Derived from audited consolidated financial statements