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Note 4 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Securities available-for-sale, less than 12 months, fair value $ 22,672 $ 352,103
Securities available-for-sale, less than 12 months, unrealized losses (159) (18,700)
Securities available-for-sale, 12 months or more, fair value 969,852 760,051
Securities available-for-sale, 12 months or more, unrealized losses (123,060) (135,009)
Securities available-for-sale, fair value 992,524 1,112,154
Securities available-for-sale, unrealized losses (123,219) (153,709)
Securities HTM, less than 12 months, fair value 455 431,833
Securities HTM, less than 12 months, unrealized losses (1) (41,384)
Securities HTM, 12 months or more, fair value 407,798 0
Securities HTM, 12 months or more, unrealized losses (31,318) 0
Securities HTM, fair value 408,253 431,833
Securities HTM, unrealized losses (31,319) (41,384)
US Treasury Securities and US Government Agencies Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 0 3,025
Securities available-for-sale, less than 12 months, unrealized losses 0 (57)
Securities available-for-sale, 12 months or more, fair value 116,269 111,966
Securities available-for-sale, 12 months or more, unrealized losses (3,662) (7,870)
Securities available-for-sale, fair value 116,269 114,991
Securities available-for-sale, unrealized losses (3,662) (7,927)
Securities HTM, less than 12 months, fair value 0 208,628
Securities HTM, less than 12 months, unrealized losses 0 (9,166)
Securities HTM, 12 months or more, fair value 198,327 0
Securities HTM, 12 months or more, unrealized losses (4,932) 0
Securities HTM, fair value 198,327 208,628
Securities HTM, unrealized losses (4,932) (9,166)
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 0 99,785
Securities available-for-sale, less than 12 months, unrealized losses 0 (3,553)
Securities available-for-sale, 12 months or more, fair value 83,675 22,484
Securities available-for-sale, 12 months or more, unrealized losses (4,987) (2,884)
Securities available-for-sale, fair value 83,675 122,269
Securities available-for-sale, unrealized losses (4,987) (6,437)
Securities HTM, less than 12 months, fair value 455 24,948
Securities HTM, less than 12 months, unrealized losses (1) (2,559)
Securities HTM, 12 months or more, fair value 23,967 0
Securities HTM, 12 months or more, unrealized losses (2,456) 0
Securities HTM, fair value 24,422 24,948
Securities HTM, unrealized losses (2,457) (2,559)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available-for-sale, less than 12 months, fair value 16,346 180,263
Securities available-for-sale, less than 12 months, unrealized losses (95) (11,114)
Securities available-for-sale, 12 months or more, fair value 661,195 567,988
Securities available-for-sale, 12 months or more, unrealized losses (101,094) (110,471)
Securities available-for-sale, fair value 677,541 748,251
Securities available-for-sale, unrealized losses (101,189) (121,585)
Securities HTM, less than 12 months, fair value 0 198,257
Securities HTM, less than 12 months, unrealized losses 0 (29,659)
Securities HTM, 12 months or more, fair value 185,504 0
Securities HTM, 12 months or more, unrealized losses (23,930) 0
Securities HTM, fair value 185,504 198,257
Securities HTM, unrealized losses (23,930) (29,659)
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 6,326 64,165
Securities available-for-sale, less than 12 months, unrealized losses (64) (3,763)
Securities available-for-sale, 12 months or more, fair value 105,179 56,864
Securities available-for-sale, 12 months or more, unrealized losses (13,030) (13,655)
Securities available-for-sale, fair value 111,505 121,029
Securities available-for-sale, unrealized losses (13,094) (17,418)
Other Debt Obligations [Member]    
Securities available-for-sale, less than 12 months, fair value 0 4,865
Securities available-for-sale, less than 12 months, unrealized losses 0 (213)
Securities available-for-sale, 12 months or more, fair value 3,534 749
Securities available-for-sale, 12 months or more, unrealized losses (287) (129)
Securities available-for-sale, fair value 3,534 5,614
Securities available-for-sale, unrealized losses $ (287) $ (342)