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Note 2 - INVESTMENT SECURITIES - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value $ 235,836  
Securities HTM, Less than 12 Months, Gross Unrealized Losses (20,777)  
Securities HTM, 12 Months or More, Fair Value 237,690  
Securities HTM, 12 Months or More, Gross Unrealized Losses (71,967)  
Securities HTM, Total, Fair Value 473,526  
Securities HTM, Total, Gross Unrealized Losses (92,744)  
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 6,616 $ 280,669
Securities AFS, Less than 12 Months, Gross Unrealized Losses (467) (48,923)
Securities AFS, 12 Months or More, Fair Value 264,116 42,212
Securities AFS, 12 Months or More, Gross Unrealized Losses (73,062) (10,788)
Securities AFS, Total, Fair Value 270,732 322,881
Securities AFS, Total, Gross Unrealized Losses (73,529) (59,711)
Municipal securities.    
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value 235,313 347,651
Securities HTM, Less than 12 Months, Gross Unrealized Losses (20,751) (56,798)
Securities HTM, 12 Months or More, Fair Value 237,690  
Securities HTM, 12 Months or More, Gross Unrealized Losses (71,967)  
Securities HTM, Total, Fair Value 473,003 347,651
Securities HTM, Total, Gross Unrealized Losses (92,718) (56,798)
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 1,067 178,172
Securities AFS, Less than 12 Months, Gross Unrealized Losses (38) (42,661)
Securities AFS, 12 Months or More, Fair Value 148,159 9,809
Securities AFS, 12 Months or More, Gross Unrealized Losses (57,508) (4,039)
Securities AFS, Total, Fair Value 149,226 187,981
Securities AFS, Total, Gross Unrealized Losses (57,546) (46,700)
U.S. treasuries and govt. sponsored agency securities    
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 1,649 5,138
Securities AFS, Less than 12 Months, Gross Unrealized Losses (1) (326)
Securities AFS, 12 Months or More, Fair Value 13,377 10,591
Securities AFS, 12 Months or More, Gross Unrealized Losses (3,140) (2,457)
Securities AFS, Total, Fair Value 15,026 15,729
Securities AFS, Total, Gross Unrealized Losses (3,141) (2,783)
Residential mortgage-backed and related securities    
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 77 48,469
Securities AFS, Less than 12 Months, Gross Unrealized Losses (1) (3,327)
Securities AFS, 12 Months or More, Fair Value 57,869 17,690
Securities AFS, 12 Months or More, Gross Unrealized Losses (8,486) (3,896)
Securities AFS, Total, Fair Value 57,946 66,159
Securities AFS, Total, Gross Unrealized Losses (8,487) (7,223)
Asset-backed securities    
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value   13,684
Securities AFS, Less than 12 Months, Gross Unrealized Losses   (205)
Securities AFS, 12 Months or More, Fair Value 10,521  
Securities AFS, 12 Months or More, Gross Unrealized Losses (44)  
Securities AFS, Total, Fair Value 10,521 13,684
Securities AFS, Total, Gross Unrealized Losses (44) (205)
Other securities    
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value 523  
Securities HTM, Less than 12 Months, Gross Unrealized Losses (26)  
Securities HTM, Total, Fair Value 523  
Securities HTM, Total, Gross Unrealized Losses (26)  
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 3,823 35,206
Securities AFS, Less than 12 Months, Gross Unrealized Losses (427) (2,404)
Securities AFS, 12 Months or More, Fair Value 34,190 4,122
Securities AFS, 12 Months or More, Gross Unrealized Losses (3,884) (396)
Securities AFS, Total, Fair Value 38,013 39,328
Securities AFS, Total, Gross Unrealized Losses $ (4,311) $ (2,800)