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Note 3 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Less than 12 months, estimated fair value $ 417,733 $ 19,522
Less than 12 months, unrealized losses (6,174) (73)
12 months or more, estimated fair value 10,085 1,076
12 months or more, unrealized losses (329) (8)
Total estimated fair value 427,818 20,598
Total unrealized losses (6,503) (81)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value 163,206  
Less than 12 months, unrealized losses (2,083)  
12 months or more, estimated fair value 0  
12 months or more, unrealized losses 0  
Total estimated fair value 163,206  
Total unrealized losses (2,083)  
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 30,647 6,016
Less than 12 months, unrealized losses (570) (7)
12 months or more, estimated fair value 5,836 896
12 months or more, unrealized losses (182) (6)
Total estimated fair value 36,483 6,912
Total unrealized losses (752) (13)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Less than 12 months, estimated fair value 92,192 5,097
Less than 12 months, unrealized losses (1,580) (31)
12 months or more, estimated fair value 2,524 0
12 months or more, unrealized losses (90) 0
Total estimated fair value 94,716 5,097
Total unrealized losses (1,670) (31)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 115,204 7,875
Less than 12 months, unrealized losses (1,667) (34)
12 months or more, estimated fair value 1,725 180
12 months or more, unrealized losses (57) (2)
Total estimated fair value 116,929 8,055
Total unrealized losses (1,724) (36)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 16,484 534
Less than 12 months, unrealized losses (274) (1)
12 months or more, estimated fair value 0 0
12 months or more, unrealized losses 0 0
Total estimated fair value 16,484 534
Total unrealized losses $ (274) $ (1)