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Note 2 - INVESTMENT SECURITIES - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value $ 220,318  
Securities HTM, Less than 12 Months, Gross Unrealized Losses (29,779)  
Securities HTM, 12 Months or More, Fair Value 136,224  
Securities HTM, 12 Months or More, Gross Unrealized Losses (19,296)  
Securities HTM, Total, Fair Value 356,542  
Securities HTM, Total, Gross Unrealized Losses (49,075)  
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 18,007 $ 280,669
Securities AFS, Less than 12 Months, Gross Unrealized Losses (866) (48,923)
Securities AFS, 12 Months or More, Fair Value 274,135 42,212
Securities AFS, 12 Months or More, Gross Unrealized Losses (53,579) (10,788)
Securities AFS, Total, Fair Value 292,142 322,881
Securities AFS, Total, Gross Unrealized Losses (54,445) (59,711)
Municipal securities.    
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value 219,789 347,651
Securities HTM, Less than 12 Months, Gross Unrealized Losses (29,758) (56,798)
Securities HTM, 12 Months or More, Fair Value 136,224  
Securities HTM, 12 Months or More, Gross Unrealized Losses (19,296)  
Securities HTM, Total, Fair Value 356,013 347,651
Securities HTM, Total, Gross Unrealized Losses (49,054) (56,798)
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 1,910 178,172
Securities AFS, Less than 12 Months, Gross Unrealized Losses (59) (42,661)
Securities AFS, 12 Months or More, Fair Value 164,631 9,809
Securities AFS, 12 Months or More, Gross Unrealized Losses (40,070) (4,039)
Securities AFS, Total, Fair Value 166,541 187,981
Securities AFS, Total, Gross Unrealized Losses (40,129) (46,700)
U.S. treasuries and govt. sponsored agency securities    
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 3,866 5,138
Securities AFS, Less than 12 Months, Gross Unrealized Losses (5) (326)
Securities AFS, 12 Months or More, Fair Value 14,056 10,591
Securities AFS, 12 Months or More, Gross Unrealized Losses (2,669) (2,457)
Securities AFS, Total, Fair Value 17,922 15,729
Securities AFS, Total, Gross Unrealized Losses (2,674) (2,783)
Residential mortgage-backed and related securities    
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 4,377 48,469
Securities AFS, Less than 12 Months, Gross Unrealized Losses (212) (3,327)
Securities AFS, 12 Months or More, Fair Value 56,581 17,690
Securities AFS, 12 Months or More, Gross Unrealized Losses (6,856) (3,896)
Securities AFS, Total, Fair Value 60,958 66,159
Securities AFS, Total, Gross Unrealized Losses (7,068) (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 10,848  
Securities AFS, 12 Months or More, Gross Unrealized Losses (96)  
Securities AFS, Total, Fair Value 10,848 13,684
Securities AFS, Total, Gross Unrealized Losses (96) (205)
Other securities    
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value 529  
Securities HTM, Less than 12 Months, Gross Unrealized Losses (21)  
Securities HTM, Total, Fair Value 529  
Securities HTM, Total, Gross Unrealized Losses (21)  
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 7,854 35,206
Securities AFS, Less than 12 Months, Gross Unrealized Losses (590) (2,404)
Securities AFS, 12 Months or More, Fair Value 28,019 4,122
Securities AFS, 12 Months or More, Gross Unrealized Losses (3,888) (396)
Securities AFS, Total, Fair Value 35,873 39,328
Securities AFS, Total, Gross Unrealized Losses $ (4,478) $ (2,800)