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Note 2 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Securities available-for-sale, less than 12 months, fair value $ 52,893 $ 352,103
Securities available-for-sale, less than 12 months, unrealized losses (2,604) (18,700)
Securities available-for-sale, 12 months or more, fair value 951,150 760,051
Securities available-for-sale, 12 months or more, unrealized losses (173,053) (135,009)
Securities available-for-sale, fair value 1,004,043 1,112,154
Securities available-for-sale, unrealized losses (175,657) (153,709)
Securities HTM, less than 12 months, fair value 1,415 431,833
Securities HTM, less than 12 months, unrealized losses (4) (41,384)
Securities HTM, 12 months or more, fair value 395,954 0
Securities HTM, 12 months or more, unrealized losses (47,783) 0
Securities HTM, fair value 397,369 431,833
Securities HTM, unrealized losses (47,787) (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 118,009 111,966
Securities available-for-sale, 12 months or more, unrealized losses (5,491) (7,870)
Securities available-for-sale, fair value 118,009 114,991
Securities available-for-sale, unrealized losses (5,491) (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 196,494 0
Securities HTM, 12 months or more, unrealized losses (7,645) 0
Securities HTM, fair value 196,494 208,628
Securities HTM, unrealized losses (7,645) (9,166)
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 10,262 99,785
Securities available-for-sale, less than 12 months, unrealized losses (42) (3,553)
Securities available-for-sale, 12 months or more, fair value 83,081 22,484
Securities available-for-sale, 12 months or more, unrealized losses (6,771) (2,884)
Securities available-for-sale, fair value 93,343 122,269
Securities available-for-sale, unrealized losses (6,813) (6,437)
Securities HTM, less than 12 months, fair value 1,415 24,948
Securities HTM, less than 12 months, unrealized losses (4) (2,559)
Securities HTM, 12 months or more, fair value 22,009 0
Securities HTM, 12 months or more, unrealized losses (3,532) 0
Securities HTM, fair value 23,424 24,948
Securities HTM, unrealized losses (3,536) (2,559)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available-for-sale, less than 12 months, fair value 29,149 180,263
Securities available-for-sale, less than 12 months, unrealized losses (1,633) (11,114)
Securities available-for-sale, 12 months or more, fair value 643,517 567,988
Securities available-for-sale, 12 months or more, unrealized losses (139,925) (110,471)
Securities available-for-sale, fair value 672,666 748,251
Securities available-for-sale, unrealized losses (141,558) (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 177,451 0
Securities HTM, 12 months or more, unrealized losses (36,606) 0
Securities HTM, fair value 177,451 198,257
Securities HTM, unrealized losses (36,606) (29,659)
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 13,482 64,165
Securities available-for-sale, less than 12 months, unrealized losses (929) (3,763)
Securities available-for-sale, 12 months or more, fair value 103,094 56,864
Securities available-for-sale, 12 months or more, unrealized losses (20,459) (13,655)
Securities available-for-sale, fair value 116,576 121,029
Securities available-for-sale, unrealized losses (21,388) (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 3,449 749
Securities available-for-sale, 12 months or more, unrealized losses (407) (129)
Securities available-for-sale, fair value 3,449 5,614
Securities available-for-sale, unrealized losses $ (407) $ (342)