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Note 3 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value $ 1,855  
Securities HTM, Less than 12 Months, Gross Unrealized Losses (26)  
Securities HTM, 12 Months or More, Fair Value 289,891  
Securities HTM, 12 Months or More, Gross Unrealized Losses (36,628)  
Securities HTM, Total, Fair Value 291,746  
Securities HTM, Total, Gross Unrealized Losses (36,654)  
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 4,088 $ 280,669
Securities AFS, Less than 12 Months, Gross Unrealized Losses (395) (48,923)
Securities AFS, 12 Months or More, Fair Value 282,087 42,212
Securities AFS, 12 Months or More, Gross Unrealized Losses (47,784) (10,788)
Securities AFS, Total, Fair Value 286,175 322,881
Securities AFS, Total, Gross Unrealized Losses (48,179) (59,711)
Municipal securities.    
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value 1,320 347,651
Securities HTM, Less than 12 Months, Gross Unrealized Losses (11) (56,798)
Securities HTM, 12 Months or More, Fair Value 289,891  
Securities HTM, 12 Months or More, Gross Unrealized Losses (36,628)  
Securities HTM, Total, Fair Value 291,211 347,651
Securities HTM, Total, Gross Unrealized Losses (36,639) (56,798)
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 283 178,172
Securities AFS, Less than 12 Months, Gross Unrealized Losses (2) (42,661)
Securities AFS, 12 Months or More, Fair Value 169,876 9,809
Securities AFS, 12 Months or More, Gross Unrealized Losses (35,588) (4,039)
Securities AFS, Total, Fair Value 170,159 187,981
Securities AFS, Total, Gross Unrealized Losses (35,590) (46,700)
U.S. treasuries and govt. sponsored agency securities    
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value   5,138
Securities AFS, Less than 12 Months, Gross Unrealized Losses   (326)
Securities AFS, 12 Months or More, Fair Value 14,018 10,591
Securities AFS, 12 Months or More, Gross Unrealized Losses (2,438) (2,457)
Securities AFS, Total, Fair Value 14,018 15,729
Securities AFS, Total, Gross Unrealized Losses (2,438) (2,783)
Residential mortgage-backed and related securities    
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value   48,469
Securities AFS, Less than 12 Months, Gross Unrealized Losses   (3,327)
Securities AFS, 12 Months or More, Fair Value 59,118 17,690
Securities AFS, 12 Months or More, Gross Unrealized Losses (5,972) (3,896)
Securities AFS, Total, Fair Value 59,118 66,159
Securities AFS, Total, Gross Unrealized Losses (5,972) (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 3,804  
Securities AFS, 12 Months or More, Gross Unrealized Losses (5)  
Securities AFS, Total, Fair Value 3,804 13,684
Securities AFS, Total, Gross Unrealized Losses (5) (205)
Other securities    
Securities HTM:    
Securities HTM, Less than 12 Months, Fair Value 535  
Securities HTM, Less than 12 Months, Gross Unrealized Losses (15)  
Securities HTM, Total, Fair Value 535  
Securities HTM, Total, Gross Unrealized Losses (15)  
Securities AFS:    
Securities AFS, Less than 12 Months, Fair Value 3,805 35,206
Securities AFS, Less than 12 Months, Gross Unrealized Losses (393) (2,404)
Securities AFS, 12 Months or More, Fair Value 35,271 4,122
Securities AFS, 12 Months or More, Gross Unrealized Losses (3,781) (396)
Securities AFS, Total, Fair Value 39,076 39,328
Securities AFS, Total, Gross Unrealized Losses $ (4,174) $ (2,800)