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Note 2 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Securities available-for-sale, less than 12 months, fair value $ 13,667 $ 22,672
Securities HTM, less than 12 months, fair value 402 455
Securities available-for-sale, less than 12 months, unrealized losses (85) (159)
Securities HTM, less than 12 months, unrealized losses (4) (1)
Securities available-for-sale, 12 months or more, fair value 808,725 969,852
Securities HTM, 12 months or more, fair value 351,799 407,798
Securities available-for-sale, 12 months or more, unrealized losses (97,074) (123,060)
Securities HTM, 12 months or more, unrealized losses (22,481) (31,318)
Securities available-for-sale, fair value 822,392 992,524
Securities HTM, fair value 352,201 408,253
Securities available-for-sale, unrealized losses (97,159) (123,219)
Securities HTM, unrealized losses (22,485) (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 19,966 116,269
Securities HTM, 12 months or more, fair value 152,153 198,327
Securities available-for-sale, 12 months or more, unrealized losses (33) (3,662)
Securities HTM, 12 months or more, unrealized losses (1,539) (4,932)
Securities available-for-sale, fair value 19,966 116,269
Securities HTM, fair value 152,153 198,327
Securities available-for-sale, unrealized losses (33) (3,662)
Securities HTM, unrealized losses (1,539) (4,932)
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 5,916 0
Securities HTM, less than 12 months, fair value 402 455
Securities available-for-sale, less than 12 months, unrealized losses (16) 0
Securities HTM, less than 12 months, unrealized losses (4) (1)
Securities available-for-sale, 12 months or more, fair value 77,159 83,675
Securities HTM, 12 months or more, fair value 23,825 23,967
Securities available-for-sale, 12 months or more, unrealized losses (3,511) (4,987)
Securities HTM, 12 months or more, unrealized losses (1,474) (2,456)
Securities available-for-sale, fair value 83,075 83,675
Securities HTM, fair value 24,227 24,422
Securities available-for-sale, unrealized losses (3,527) (4,987)
Securities HTM, unrealized losses (1,478) (2,457)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Securities available-for-sale, less than 12 months, fair value 0 16,346
Securities HTM, less than 12 months, fair value 0 0
Securities available-for-sale, less than 12 months, unrealized losses 0 (95)
Securities HTM, less than 12 months, unrealized losses 0 0
Securities available-for-sale, 12 months or more, fair value 607,428 661,195
Securities HTM, 12 months or more, fair value 175,821 185,504
Securities available-for-sale, 12 months or more, unrealized losses (82,543) (101,094)
Securities HTM, 12 months or more, unrealized losses (19,468) (23,930)
Securities available-for-sale, fair value 607,428 677,541
Securities HTM, fair value 175,821 185,504
Securities available-for-sale, unrealized losses (82,543) (101,189)
Securities HTM, unrealized losses (19,468) (23,930)
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 7,751 6,326
Securities available-for-sale, less than 12 months, unrealized losses (69) (64)
Securities available-for-sale, 12 months or more, fair value 100,646 105,179
Securities available-for-sale, 12 months or more, unrealized losses (10,794) (13,030)
Securities available-for-sale, fair value 108,397 111,505
Securities available-for-sale, unrealized losses (10,863) (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 3,526 3,534
Securities available-for-sale, 12 months or more, unrealized losses (193) (287)
Securities available-for-sale, fair value 3,526 3,534
Securities available-for-sale, unrealized losses $ (193) $ (287)