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Note 3 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Securities available-for-sale, less than 12 months, fair value $ 164,154 $ 352,103
Securities available-for-sale, less than 12 months, unrealized losses (4,078) (18,700)
Securities available-for-sale, 12 months or more, fair value 926,975 760,051
Securities available-for-sale, 12 months or more, unrealized losses (130,501) (135,009)
Securities available-for-sale, fair value 1,091,129 1,112,154
Securities available-for-sale, unrealized losses (134,579) (153,709)
Securities HTM, less than 12 months, fair value 2,011 431,833
Securities HTM, less than 12 months, unrealized losses (13) (41,384)
Securities HTM, 12 months or more, fair value 431,889 0
Securities HTM, 12 months or more, unrealized losses (34,838) 0
Securities HTM, fair value 433,900 431,833
Securities HTM, unrealized losses (34,851) (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 116,288 111,966
Securities available-for-sale, 12 months or more, unrealized losses (6,464) (7,870)
Securities available-for-sale, fair value 116,288 114,991
Securities available-for-sale, unrealized losses (6,464) (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 210,841 0
Securities HTM, 12 months or more, unrealized losses (7,065) 0
Securities HTM, fair value 210,841 208,628
Securities HTM, unrealized losses (7,065) (9,166)
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 43,668 99,785
Securities available-for-sale, less than 12 months, unrealized losses (157) (3,553)
Securities available-for-sale, 12 months or more, fair value 76,479 22,484
Securities available-for-sale, 12 months or more, unrealized losses (5,039) (2,884)
Securities available-for-sale, fair value 120,147 122,269
Securities available-for-sale, unrealized losses (5,196) (6,437)
Securities HTM, less than 12 months, fair value 1,602 24,948
Securities HTM, less than 12 months, unrealized losses (4) (2,559)
Securities HTM, 12 months or more, fair value 23,743 0
Securities HTM, 12 months or more, unrealized losses (1,880) 0
Securities HTM, fair value 25,345 24,948
Securities HTM, unrealized losses (1,884) (2,559)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available-for-sale, less than 12 months, fair value 113,174 180,263
Securities available-for-sale, less than 12 months, unrealized losses (3,879) (11,114)
Securities available-for-sale, 12 months or more, fair value 620,688 567,988
Securities available-for-sale, 12 months or more, unrealized losses (104,545) (110,471)
Securities available-for-sale, fair value 733,862 748,251
Securities available-for-sale, unrealized losses (108,424) (121,585)
Securities HTM, less than 12 months, fair value 409 198,257
Securities HTM, less than 12 months, unrealized losses (9) (29,659)
Securities HTM, 12 months or more, fair value 197,305 0
Securities HTM, 12 months or more, unrealized losses (25,893) 0
Securities HTM, fair value 197,714 198,257
Securities HTM, unrealized losses (25,902) (29,659)
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 7,312 64,165
Securities available-for-sale, less than 12 months, unrealized losses (42) (3,763)
Securities available-for-sale, 12 months or more, fair value 107,916 56,864
Securities available-for-sale, 12 months or more, unrealized losses (14,134) (13,655)
Securities available-for-sale, fair value 115,228 121,029
Securities available-for-sale, unrealized losses (14,176) (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 5,604 749
Securities available-for-sale, 12 months or more, unrealized losses (319) (129)
Securities available-for-sale, fair value 5,604 5,614
Securities available-for-sale, unrealized losses $ (319) $ (342)