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Note 2 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Securities available-for-sale, less than 12 months, fair value $ 174,110 $ 352,103
Securities available-for-sale, less than 12 months, unrealized losses (5,828) (18,700)
Securities available-for-sale, 12 months or more, fair value 895,607 760,051
Securities available-for-sale, 12 months or more, unrealized losses (139,919) (135,009)
Securities available-for-sale, fair value 1,069,717 1,112,154
Securities available-for-sale, unrealized losses (145,747) (153,709)
Securities HTM, less than 12 months, fair value 1,559 431,833
Securities HTM, less than 12 months, unrealized losses (7) (41,384)
Securities HTM, 12 months or more, fair value 408,690 0
Securities HTM, 12 months or more, unrealized losses (39,773) 0
Securities HTM, fair value 410,249 431,833
Securities HTM, unrealized losses (39,780) (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 116,217 111,966
Securities available-for-sale, 12 months or more, unrealized losses (6,710) (7,870)
Securities available-for-sale, fair value 116,217 114,991
Securities available-for-sale, unrealized losses (6,710) (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 195,339 0
Securities HTM, 12 months or more, unrealized losses (8,678) 0
Securities HTM, fair value 195,339 208,628
Securities HTM, unrealized losses (8,678) (9,166)
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 43,334 99,785
Securities available-for-sale, less than 12 months, unrealized losses (107) (3,553)
Securities available-for-sale, 12 months or more, fair value 74,092 22,484
Securities available-for-sale, 12 months or more, unrealized losses (5,996) (2,884)
Securities available-for-sale, fair value 117,426 122,269
Securities available-for-sale, unrealized losses (6,103) (6,437)
Securities HTM, less than 12 months, fair value 1,502 24,948
Securities HTM, less than 12 months, unrealized losses (4) (2,559)
Securities HTM, 12 months or more, fair value 22,670 0
Securities HTM, 12 months or more, unrealized losses (2,951) 0
Securities HTM, fair value 24,172 24,948
Securities HTM, unrealized losses (2,955) (2,559)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available-for-sale, less than 12 months, fair value 114,246 180,263
Securities available-for-sale, less than 12 months, unrealized losses (5,479) (11,114)
Securities available-for-sale, 12 months or more, fair value 595,295 567,988
Securities available-for-sale, 12 months or more, unrealized losses (111,698) (110,471)
Securities available-for-sale, fair value 709,541 748,251
Securities available-for-sale, unrealized losses (117,177) (121,585)
Securities HTM, less than 12 months, fair value 57 198,257
Securities HTM, less than 12 months, unrealized losses (3) (29,659)
Securities HTM, 12 months or more, fair value 190,681 0
Securities HTM, 12 months or more, unrealized losses (28,144) 0
Securities HTM, fair value 190,738 198,257
Securities HTM, unrealized losses (28,147) (29,659)
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 16,530 64,165
Securities available-for-sale, less than 12 months, unrealized losses (242) (3,763)
Securities available-for-sale, 12 months or more, fair value 106,563 56,864
Securities available-for-sale, 12 months or more, unrealized losses (15,065) (13,655)
Securities available-for-sale, fair value 123,093 121,029
Securities available-for-sale, unrealized losses (15,307) (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 3,440 749
Securities available-for-sale, 12 months or more, unrealized losses (450) (129)
Securities available-for-sale, fair value 3,440 5,614
Securities available-for-sale, unrealized losses $ (450) $ (342)