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Note 3 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Securities available-for-sale, less than 12 months, fair value $ 38,141 $ 22,672
Securities HTM, less than 12 months, fair value 396 455
Securities available-for-sale, less than 12 months, unrealized losses (792) (159)
Securities HTM, less than 12 months, unrealized losses (6) (1)
Securities available-for-sale, 12 months or more, fair value 746,233 969,852
Securities HTM, 12 months or more, fair value 340,798 407,798
Securities available-for-sale, 12 months or more, unrealized losses (124,199) (123,060)
Securities HTM, 12 months or more, unrealized losses (28,810) (31,318)
Securities available-for-sale, fair value 784,374 992,524
Securities HTM, fair value 341,194 408,253
Securities available-for-sale, unrealized losses (124,991) (123,219)
Securities HTM, unrealized losses (28,816) (31,319)
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 5,801 0
Securities HTM, less than 12 months, fair value 396 455
Securities available-for-sale, less than 12 months, unrealized losses (49) 0
Securities HTM, less than 12 months, unrealized losses (6) (1)
Securities available-for-sale, 12 months or more, fair value 74,478 83,675
Securities HTM, 12 months or more, fair value 22,965 23,967
Securities available-for-sale, 12 months or more, unrealized losses (4,798) (4,987)
Securities HTM, 12 months or more, unrealized losses (2,028) (2,456)
Securities available-for-sale, fair value 80,279 83,675
Securities HTM, fair value 23,361 24,422
Securities available-for-sale, unrealized losses (4,847) (4,987)
Securities HTM, unrealized losses (2,034) (2,457)
US Treasury Securities and US Government Agencies Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value   0
Securities HTM, less than 12 months, fair value 0 0
Securities available-for-sale, less than 12 months, unrealized losses   0
Securities HTM, less than 12 months, unrealized losses 0 0
Securities available-for-sale, 12 months or more, fair value   116,269
Securities HTM, 12 months or more, fair value 153,109 198,327
Securities available-for-sale, 12 months or more, unrealized losses   (3,662)
Securities HTM, 12 months or more, unrealized losses (741) (4,932)
Securities available-for-sale, fair value   116,269
Securities HTM, fair value 153,109 198,327
Securities available-for-sale, unrealized losses   (3,662)
Securities HTM, unrealized losses (741) (4,932)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Securities available-for-sale, less than 12 months, fair value 23,159 16,346
Securities HTM, less than 12 months, fair value 0 0
Securities available-for-sale, less than 12 months, unrealized losses (579) (95)
Securities HTM, less than 12 months, unrealized losses 0 0
Securities available-for-sale, 12 months or more, fair value 567,818 661,195
Securities HTM, 12 months or more, fair value 164,724 185,504
Securities available-for-sale, 12 months or more, unrealized losses (105,211) (101,094)
Securities HTM, 12 months or more, unrealized losses (26,041) (23,930)
Securities available-for-sale, fair value 590,977 677,541
Securities HTM, fair value 164,724 185,504
Securities available-for-sale, unrealized losses (105,790) (101,189)
Securities HTM, unrealized losses (26,041) (23,930)
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 9,181 6,326
Securities available-for-sale, less than 12 months, unrealized losses (164) (64)
Securities available-for-sale, 12 months or more, fair value 101,407 105,179
Securities available-for-sale, 12 months or more, unrealized losses (14,034) (13,030)
Securities available-for-sale, fair value 110,588 111,505
Securities available-for-sale, unrealized losses (14,198) (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 2,530 3,534
Securities available-for-sale, 12 months or more, unrealized losses (156) (287)
Securities available-for-sale, fair value 2,530 3,534
Securities available-for-sale, unrealized losses $ (156) $ (287)