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Note 3 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Securities available-for-sale, less than 12 months, fair value $ 800,613 $ 808,870
Securities available-for-sale, less than 12 months, unrealized losses (72,355) (12,206)
Securities available-for-sale, 12 months or more, fair value 282,493 103,568
Securities available-for-sale, 12 months or more, unrealized losses (43,132) (3,156)
Securities available-for-sale, fair value 1,083,106 912,438
Securities available-for-sale, unrealized losses (115,487) (15,362)
Securities HTM, less than 12 months, fair value 458,762  
Securities HTM, less than 12 months, unrealized losses (24,626)  
Securities HTM, 12 months or more, fair value 0  
Securities HTM, 12 months or more, unrealized losses 0  
Securities HTM, fair value 458,762  
Securities HTM, unrealized losses (24,626)  
US Treasury Securities and US Government Agencies Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 115,533 122,501
Securities available-for-sale, less than 12 months, unrealized losses (6,314) (1,252)
Securities available-for-sale, 12 months or more, fair value 0 0
Securities available-for-sale, 12 months or more, unrealized losses 0 0
Securities available-for-sale, fair value 115,533 122,501
Securities available-for-sale, unrealized losses (6,314) (1,252)
Securities HTM, less than 12 months, fair value 215,015  
Securities HTM, less than 12 months, unrealized losses (4,559)  
Securities HTM, 12 months or more, fair value 0  
Securities HTM, 12 months or more, unrealized losses 0  
Securities HTM, fair value 215,015  
Securities HTM, unrealized losses (4,559)  
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 80,629 23,789
Securities available-for-sale, less than 12 months, unrealized losses (3,574) (223)
Securities available-for-sale, 12 months or more, fair value 8,102 447
Securities available-for-sale, 12 months or more, unrealized losses (302) (13)
Securities available-for-sale, fair value 88,731 24,236
Securities available-for-sale, unrealized losses (3,876) (236)
Securities HTM, less than 12 months, fair value 25,213  
Securities HTM, less than 12 months, unrealized losses (665)  
Securities HTM, 12 months or more, fair value 0  
Securities HTM, 12 months or more, unrealized losses 0  
Securities HTM, fair value 25,213  
Securities HTM, unrealized losses (665)  
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available-for-sale, less than 12 months, fair value 472,323 615,130
Securities available-for-sale, less than 12 months, unrealized losses (49,162) (10,027)
Securities available-for-sale, 12 months or more, fair value 273,568 102,637
Securities available-for-sale, 12 months or more, unrealized losses (42,647) (3,127)
Securities available-for-sale, fair value 745,891 717,767
Securities available-for-sale, unrealized losses (91,809) (13,154)
Securities HTM, less than 12 months, fair value 218,534  
Securities HTM, less than 12 months, unrealized losses (19,402)  
Securities HTM, 12 months or more, fair value 0  
Securities HTM, 12 months or more, unrealized losses 0  
Securities HTM, fair value 218,534  
Securities HTM, unrealized losses (19,402)  
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 126,114 46,493
Securities available-for-sale, less than 12 months, unrealized losses (13,098) (686)
Securities available-for-sale, 12 months or more, fair value 823 484
Securities available-for-sale, 12 months or more, unrealized losses (183) (16)
Securities available-for-sale, fair value 126,937 46,977
Securities available-for-sale, unrealized losses (13,281) (702)
Other Debt Obligations [Member]    
Securities available-for-sale, less than 12 months, fair value 6,014 957
Securities available-for-sale, less than 12 months, unrealized losses (207) (18)
Securities available-for-sale, 12 months or more, fair value 0 0
Securities available-for-sale, 12 months or more, unrealized losses 0 0
Securities available-for-sale, fair value 6,014 957
Securities available-for-sale, unrealized losses $ (207) $ (18)