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Note 2 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Securities available-for-sale, less than 12 months, fair value $ 26,024 $ 22,672
Securities available-for-sale, less than 12 months, unrealized losses (226) (159)
Securities available-for-sale, 12 months or more, fair value 953,088 969,852
Securities available-for-sale, 12 months or more, unrealized losses (129,253) (123,060)
Securities available-for-sale, fair value 979,112 992,524
Securities available-for-sale, unrealized losses (129,479) (123,219)
Securities HTM, less than 12 months, fair value 628 455
Securities HTM, less than 12 months, unrealized losses (2) (1)
Securities HTM, 12 months or more, fair value 351,229 407,798
Securities HTM, 12 months or more, unrealized losses (33,533) (31,318)
Securities HTM, fair value 351,857 408,253
Securities HTM, unrealized losses (33,535) (31,319)
US Treasury Securities and US Government Agencies Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 0 0
Securities available-for-sale, less than 12 months, unrealized losses 0 0
Securities available-for-sale, 12 months or more, fair value 117,478 116,269
Securities available-for-sale, 12 months or more, unrealized losses (2,477) (3,662)
Securities available-for-sale, fair value 117,478 116,269
Securities available-for-sale, unrealized losses (2,477) (3,662)
Securities HTM, less than 12 months, fair value 0 0
Securities HTM, less than 12 months, unrealized losses 0 0
Securities HTM, 12 months or more, fair value 149,193 198,327
Securities HTM, 12 months or more, unrealized losses (4,190) (4,932)
Securities HTM, fair value 149,193 198,327
Securities HTM, unrealized losses (4,190) (4,932)
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 4,759 0
Securities available-for-sale, less than 12 months, unrealized losses (12) 0
Securities available-for-sale, 12 months or more, fair value 80,067 83,675
Securities available-for-sale, 12 months or more, unrealized losses (5,298) (4,987)
Securities available-for-sale, fair value 84,826 83,675
Securities available-for-sale, unrealized losses (5,310) (4,987)
Securities HTM, less than 12 months, fair value 424 455
Securities HTM, less than 12 months, unrealized losses (1) (1)
Securities HTM, 12 months or more, fair value 23,681 23,967
Securities HTM, 12 months or more, unrealized losses (2,638) (2,456)
Securities HTM, fair value 24,105 24,422
Securities HTM, unrealized losses (2,639) (2,457)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Securities available-for-sale, less than 12 months, fair value 10,421 16,346
Securities available-for-sale, less than 12 months, unrealized losses (113) (95)
Securities available-for-sale, 12 months or more, fair value 647,067 661,195
Securities available-for-sale, 12 months or more, unrealized losses (107,286) (101,094)
Securities available-for-sale, fair value 657,488 677,541
Securities available-for-sale, unrealized losses (107,399) (101,189)
Securities HTM, less than 12 months, fair value 204 0
Securities HTM, less than 12 months, unrealized losses (1) 0
Securities HTM, 12 months or more, fair value 178,355 185,504
Securities HTM, 12 months or more, unrealized losses (26,705) (23,930)
Securities HTM, fair value 178,559 185,504
Securities HTM, unrealized losses (26,706) (23,930)
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 10,844 6,326
Securities available-for-sale, less than 12 months, unrealized losses (101) (64)
Securities available-for-sale, 12 months or more, fair value 104,919 105,179
Securities available-for-sale, 12 months or more, unrealized losses (13,963) (13,030)
Securities available-for-sale, fair value 115,763 111,505
Securities available-for-sale, unrealized losses (14,064) (13,094)
Other Debt Obligations [Member]    
Securities available-for-sale, less than 12 months, fair value 0 0
Securities available-for-sale, less than 12 months, unrealized losses 0 0
Securities available-for-sale, 12 months or more, fair value 3,557 3,534
Securities available-for-sale, 12 months or more, unrealized losses (229) (287)
Securities available-for-sale, fair value 3,557 3,534
Securities available-for-sale, unrealized losses $ (229) $ (287)