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Note 2 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Securities available-for-sale, less than 12 months, fair value $ 27,496 $ 22,672
Securities HTM, less than 12 months, fair value 202 455
Securities available-for-sale, less than 12 months, unrealized losses (529) (159)
Securities HTM, less than 12 months, unrealized losses 0 (1)
Securities available-for-sale, 12 months or more, fair value 924,184 969,852
Securities HTM, 12 months or more, fair value 347,254 407,798
Securities available-for-sale, 12 months or more, unrealized losses (129,339) (123,060)
Securities HTM, 12 months or more, unrealized losses (32,840) (31,318)
Securities available-for-sale, fair value 951,680 992,524
Securities HTM, fair value 347,456 408,253
Securities available-for-sale, unrealized losses (129,868) (123,219)
Securities HTM, unrealized losses (32,840) (31,319)
US Treasury Securities and US Government Agencies Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 0 0
Securities HTM, less than 12 months, fair value 0 0
Securities available-for-sale, less than 12 months, unrealized losses 0 0
Securities HTM, less than 12 months, unrealized losses 0 0
Securities available-for-sale, 12 months or more, fair value 118,875 116,269
Securities HTM, 12 months or more, fair value 150,183 198,327
Securities available-for-sale, 12 months or more, unrealized losses (1,104) (3,662)
Securities HTM, 12 months or more, unrealized losses (3,353) (4,932)
Securities available-for-sale, fair value 118,875 116,269
Securities HTM, fair value 150,183 198,327
Securities available-for-sale, unrealized losses (1,104) (3,662)
Securities HTM, unrealized losses (3,353) (4,932)
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 4,740 0
Securities HTM, less than 12 months, fair value 0 455
Securities available-for-sale, less than 12 months, unrealized losses (3) 0
Securities HTM, less than 12 months, unrealized losses 0 (1)
Securities available-for-sale, 12 months or more, fair value 78,008 83,675
Securities HTM, 12 months or more, fair value 23,644 23,967
Securities available-for-sale, 12 months or more, unrealized losses (5,156) (4,987)
Securities HTM, 12 months or more, unrealized losses (2,637) (2,456)
Securities available-for-sale, fair value 82,748 83,675
Securities HTM, fair value 23,644 24,422
Securities available-for-sale, unrealized losses (5,159) (4,987)
Securities HTM, unrealized losses (2,637) (2,457)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Securities available-for-sale, less than 12 months, fair value 11,317 16,346
Securities HTM, less than 12 months, fair value 202 0
Securities available-for-sale, less than 12 months, unrealized losses (155) (95)
Securities HTM, less than 12 months, unrealized losses 0 0
Securities available-for-sale, 12 months or more, fair value 620,763 661,195
Securities HTM, 12 months or more, fair value 173,427 185,504
Securities available-for-sale, 12 months or more, unrealized losses (108,218) (101,094)
Securities HTM, 12 months or more, unrealized losses (26,850) (23,930)
Securities available-for-sale, fair value 632,080 677,541
Securities HTM, fair value 173,629 185,504
Securities available-for-sale, unrealized losses (108,373) (101,189)
Securities HTM, unrealized losses (26,850) (23,930)
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 11,439 6,326
Securities available-for-sale, less than 12 months, unrealized losses (371) (64)
Securities available-for-sale, 12 months or more, fair value 103,010 105,179
Securities available-for-sale, 12 months or more, unrealized losses (14,638) (13,030)
Securities available-for-sale, fair value 114,449 111,505
Securities available-for-sale, unrealized losses (15,009) (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 3,528 3,534
Securities available-for-sale, 12 months or more, unrealized losses (223) (287)
Securities available-for-sale, fair value 3,528 3,534
Securities available-for-sale, unrealized losses $ (223) $ (287)