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Note 2 - INVESTMENT SECURITIES - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value $ 276,982  
Securities HTM, Less than 12 Months, Gross Unrealized Losses (33,277)  
Securities HTM, 12 Months or More, Fair Value 70,015  
Securities HTM, 12 Months or More, Gross Unrealized Losses (10,304)  
Securities HTM, Total, Fair Value 346,997  
Securities HTM, Total, Gross Unrealized Losses (43,581)  
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 92,506 $ 280,669
Securities AFS, Less than 12 Months, Gross Unrealized Losses (5,775) (48,923)
Securities AFS, 12 Months or More, Fair Value 207,705 42,212
Securities AFS, 12 Months or More, Gross Unrealized Losses (45,474) (10,788)
Securities AFS, Total, Fair Value 300,211 322,881
Securities AFS, Total, Gross Unrealized Losses (51,249) (59,711)
Municipal securities.    
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value 275,950 347,651
Securities HTM, Less than 12 Months, Gross Unrealized Losses (33,259) (56,798)
Securities HTM, 12 Months or More, Fair Value 70,015  
Securities HTM, 12 Months or More, Gross Unrealized Losses (10,304)  
Securities HTM, Total, Fair Value 345,965 347,651
Securities HTM, Total, Gross Unrealized Losses (43,563) (56,798)
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 43,572 178,172
Securities AFS, Less than 12 Months, Gross Unrealized Losses (3,340) (42,661)
Securities AFS, 12 Months or More, Fair Value 124,603 9,809
Securities AFS, 12 Months or More, Gross Unrealized Losses (35,954) (4,039)
Securities AFS, Total, Fair Value 168,175 187,981
Securities AFS, Total, Gross Unrealized Losses (39,294) (46,700)
U.S. treasuries and govt. sponsored agency securities    
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 2,212 5,138
Securities AFS, Less than 12 Months, Gross Unrealized Losses (4) (326)
Securities AFS, 12 Months or More, Fair Value 14,401 10,591
Securities AFS, 12 Months or More, Gross Unrealized Losses (2,389) (2,457)
Securities AFS, Total, Fair Value 16,613 15,729
Securities AFS, Total, Gross Unrealized Losses (2,393) (2,783)
Residential mortgage-backed and related securities    
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 17,277 48,469
Securities AFS, Less than 12 Months, Gross Unrealized Losses (814) (3,327)
Securities AFS, 12 Months or More, Fair Value 45,807 17,690
Securities AFS, 12 Months or More, Gross Unrealized Losses (5,497) (3,896)
Securities AFS, Total, Fair Value 63,084 66,159
Securities AFS, Total, Gross Unrealized Losses (6,311) (7,223)
Asset-backed securities    
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 3,303 13,684
Securities AFS, Less than 12 Months, Gross Unrealized Losses (5) (205)
Securities AFS, 12 Months or More, Fair Value 10,781  
Securities AFS, 12 Months or More, Gross Unrealized Losses (162)  
Securities AFS, Total, Fair Value 14,084 13,684
Securities AFS, Total, Gross Unrealized Losses (167) (205)
Other securities    
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value 1,032  
Securities HTM, Less than 12 Months, Gross Unrealized Losses (18)  
Securities HTM, Total, Fair Value 1,032  
Securities HTM, Total, Gross Unrealized Losses (18)  
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 26,142 35,206
Securities AFS, Less than 12 Months, Gross Unrealized Losses (1,612) (2,404)
Securities AFS, 12 Months or More, Fair Value 12,113 4,122
Securities AFS, 12 Months or More, Gross Unrealized Losses (1,472) (396)
Securities AFS, Total, Fair Value 38,255 39,328
Securities AFS, Total, Gross Unrealized Losses $ (3,084) $ (2,800)