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Note 3 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Securities available-for-sale, less than 12 months, fair value $ 510,806 $ 808,870
Securities available-for-sale, less than 12 months, unrealized losses (54,261) (12,206)
Securities available-for-sale, 12 months or more, fair value 597,455 103,568
Securities available-for-sale, 12 months or more, unrealized losses (114,102) (3,156)
Securities available-for-sale, fair value 1,108,261 912,438
Securities available-for-sale, unrealized losses (168,363) (15,362)
Securities HTM, less than 12 months, fair value 431,575  
Securities HTM, less than 12 months, unrealized losses (44,756)  
Securities HTM, 12 months or more, fair value 0  
Securities HTM, 12 months or more, unrealized losses 0  
Securities HTM, fair value 431,575  
Securities HTM, unrealized losses (44,756)  
US Treasury Securities and US Government Agencies Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 21,554 122,501
Securities available-for-sale, less than 12 months, unrealized losses (1,391) (1,252)
Securities available-for-sale, 12 months or more, fair value 92,872 0
Securities available-for-sale, 12 months or more, unrealized losses (6,988) 0
Securities available-for-sale, fair value 114,426 122,501
Securities available-for-sale, unrealized losses (8,379) (1,252)
Securities HTM, less than 12 months, fair value 208,011  
Securities HTM, less than 12 months, unrealized losses (9,673)  
Securities HTM, 12 months or more, fair value 0  
Securities HTM, 12 months or more, unrealized losses 0  
Securities HTM, fair value 208,011  
Securities HTM, unrealized losses (9,673)  
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 96,995 23,789
Securities available-for-sale, less than 12 months, unrealized losses (4,999) (223)
Securities available-for-sale, 12 months or more, fair value 16,589 447
Securities available-for-sale, 12 months or more, unrealized losses (1,670) (13)
Securities available-for-sale, fair value 113,584 24,236
Securities available-for-sale, unrealized losses (6,669) (236)
Securities HTM, less than 12 months, fair value 23,374  
Securities HTM, less than 12 months, unrealized losses (2,498)  
Securities HTM, 12 months or more, fair value 0  
Securities HTM, 12 months or more, unrealized losses 0  
Securities HTM, fair value 23,374  
Securities HTM, unrealized losses (2,498)  
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available-for-sale, less than 12 months, fair value 288,778 615,130
Securities available-for-sale, less than 12 months, unrealized losses (33,664) (10,027)
Securities available-for-sale, 12 months or more, fair value 461,306 102,637
Securities available-for-sale, 12 months or more, unrealized losses (99,135) (3,127)
Securities available-for-sale, fair value 750,084 717,767
Securities available-for-sale, unrealized losses (132,799) (13,154)
Securities HTM, less than 12 months, fair value 200,190  
Securities HTM, less than 12 months, unrealized losses (32,585)  
Securities HTM, 12 months or more, fair value 0  
Securities HTM, 12 months or more, unrealized losses 0  
Securities HTM, fair value 200,190  
Securities HTM, unrealized losses (32,585)  
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 98,599 46,493
Securities available-for-sale, less than 12 months, unrealized losses (14,002) (686)
Securities available-for-sale, 12 months or more, fair value 25,924 484
Securities available-for-sale, 12 months or more, unrealized losses (6,169) (16)
Securities available-for-sale, fair value 124,523 46,977
Securities available-for-sale, unrealized losses (20,171) (702)
Other Debt Obligations [Member]    
Securities available-for-sale, less than 12 months, fair value 4,880 957
Securities available-for-sale, less than 12 months, unrealized losses (205) (18)
Securities available-for-sale, 12 months or more, fair value 764 0
Securities available-for-sale, 12 months or more, unrealized losses (140) 0
Securities available-for-sale, fair value 5,644 957
Securities available-for-sale, unrealized losses $ (345) $ (18)