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Note 3 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value $ 347,651  
Securities HTM, Less than 12 Months, Gross Unrealized Losses (56,978)  
Securities HTM, Total, Fair Value 347,651  
Securities HTM, Total, Gross Unrealized Losses (56,978)  
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 280,669 $ 32,980
Securities AFS, Less than 12 Months, Gross Unrealized Losses (48,923) (464)
Securities AFS, 12 Months or More, Fair Value 42,212 23,442
Securities AFS, 12 Months or More, Gross Unrealized Losses (10,788) (857)
Securities AFS, Total, Fair Value 322,881 56,422
Securities AFS, Total, Gross Unrealized Losses (59,711) (1,321)
Municipal securities.    
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value 347,651  
Securities HTM, Less than 12 Months, Gross Unrealized Losses (56,978)  
Securities HTM, Total, Fair Value 347,651  
Securities HTM, Total, Gross Unrealized Losses (56,978)  
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 178,172 13,287
Securities AFS, Less than 12 Months, Gross Unrealized Losses (42,661) (211)
Securities AFS, 12 Months or More, Fair Value 9,809 1,001
Securities AFS, 12 Months or More, Gross Unrealized Losses (4,039) (4)
Securities AFS, Total, Fair Value 187,981 14,288
Securities AFS, Total, Gross Unrealized Losses (46,700) (215)
U.S. treasuries and govt. sponsored agency securities    
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 5,138 9,802
Securities AFS, Less than 12 Months, Gross Unrealized Losses (326) (156)
Securities AFS, 12 Months or More, Fair Value 10,591 3,035
Securities AFS, 12 Months or More, Gross Unrealized Losses (2,457) (140)
Securities AFS, Total, Fair Value 15,729 12,837
Securities AFS, Total, Gross Unrealized Losses (2,783) (296)
Residential mortgage-backed and related securities    
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 48,469 5,363
Securities AFS, Less than 12 Months, Gross Unrealized Losses (3,327) (67)
Securities AFS, 12 Months or More, Fair Value 17,690 19,406
Securities AFS, 12 Months or More, Gross Unrealized Losses (3,896) (713)
Securities AFS, Total, Fair Value 66,159 24,769
Securities AFS, Total, Gross Unrealized Losses (7,223) (780)
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, Total, Fair Value 13,684  
Securities AFS, Total, Gross Unrealized Losses (205)  
Other securities    
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value   1,049
Securities HTM, Less than 12 Months, Gross Unrealized Losses   (1)
Securities HTM, Total, Fair Value   1,049
Securities HTM, Total, Gross Unrealized Losses   (1)
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 35,206 4,528
Securities AFS, Less than 12 Months, Gross Unrealized Losses (2,404) (30)
Securities AFS, 12 Months or More, Fair Value 4,122  
Securities AFS, 12 Months or More, Gross Unrealized Losses (396)  
Securities AFS, Total, Fair Value 39,328 4,528
Securities AFS, Total, Gross Unrealized Losses $ (2,800) $ (30)