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Note 4 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Securities available-for-sale, less than 12 months, fair value $ 352,103 $ 808,870
Securities available-for-sale, less than 12 months, unrealized losses (18,700) (12,206)
Securities available-for-sale, 12 months or more, fair value 760,051 103,568
Securities available-for-sale, 12 months or more, unrealized losses (135,009) (3,156)
Securities available-for-sale, fair value 1,112,154 912,438
Securities available-for-sale, unrealized losses (153,709) (15,362)
Securities HTM, less than 12 months, fair value 431,833  
Securities HTM, less than 12 months, unrealized losses (41,384)  
Securities HTM, 12 months or more, fair value 0  
Securities HTM, 12 months or more, unrealized losses 0  
Securities HTM, fair value 431,833  
Securities HTM, unrealized losses (41,384)  
US Treasury Securities and US Government Agencies Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 3,025 122,501
Securities available-for-sale, less than 12 months, unrealized losses (57) (1,252)
Securities available-for-sale, 12 months or more, fair value 111,966 0
Securities available-for-sale, 12 months or more, unrealized losses (7,870) 0
Securities available-for-sale, fair value 114,991 122,501
Securities available-for-sale, unrealized losses (7,927) (1,252)
Securities HTM, less than 12 months, fair value 208,628  
Securities HTM, less than 12 months, unrealized losses (9,166)  
Securities HTM, 12 months or more, fair value 0  
Securities HTM, 12 months or more, unrealized losses 0  
Securities HTM, fair value 208,628  
Securities HTM, unrealized losses (9,166)  
US Government-sponsored Enterprises Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 99,785 23,789
Securities available-for-sale, less than 12 months, unrealized losses (3,553) (223)
Securities available-for-sale, 12 months or more, fair value 22,484 447
Securities available-for-sale, 12 months or more, unrealized losses (2,884) (13)
Securities available-for-sale, fair value 122,269 24,236
Securities available-for-sale, unrealized losses (6,437) (236)
Securities HTM, less than 12 months, fair value 24,948  
Securities HTM, less than 12 months, unrealized losses (2,559)  
Securities HTM, 12 months or more, fair value 0  
Securities HTM, 12 months or more, unrealized losses 0  
Securities HTM, fair value 24,948  
Securities HTM, unrealized losses (2,559)  
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available-for-sale, less than 12 months, fair value 180,263 615,130
Securities available-for-sale, less than 12 months, unrealized losses (11,114) (10,027)
Securities available-for-sale, 12 months or more, fair value 567,988 102,637
Securities available-for-sale, 12 months or more, unrealized losses (110,471) (3,127)
Securities available-for-sale, fair value 748,251 717,767
Securities available-for-sale, unrealized losses (121,585) (13,154)
Securities HTM, less than 12 months, fair value 198,257  
Securities HTM, less than 12 months, unrealized losses (29,659)  
Securities HTM, 12 months or more, fair value 0  
Securities HTM, 12 months or more, unrealized losses 0  
Securities HTM, fair value 198,257  
Securities HTM, unrealized losses (29,659)  
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale, less than 12 months, fair value 64,165 46,493
Securities available-for-sale, less than 12 months, unrealized losses (3,763) (686)
Securities available-for-sale, 12 months or more, fair value 56,864 484
Securities available-for-sale, 12 months or more, unrealized losses (13,655) (16)
Securities available-for-sale, fair value 121,029 46,977
Securities available-for-sale, unrealized losses (17,418) (702)
Other Debt Obligations [Member]    
Securities available-for-sale, less than 12 months, fair value 4,865 957
Securities available-for-sale, less than 12 months, unrealized losses (213) (18)
Securities available-for-sale, 12 months or more, fair value 749 0
Securities available-for-sale, 12 months or more, unrealized losses (129) 0
Securities available-for-sale, fair value 5,614 957
Securities available-for-sale, unrealized losses $ (342) $ (18)