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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Less than 12 months, estimated fair value $ 248,199 $ 19,522
Less than 12 months, unrealized losses (4,072) (73)
12 months or more, estimated fair value 1,378 1,076
12 months or more, unrealized losses (9) (8)
Total estimated fair value 249,577 20,598
Total unrealized losses (4,081) (81)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value 36,924  
Less than 12 months, unrealized losses (413)  
12 months or more, estimated fair value 0  
12 months or more, unrealized losses 0  
Total estimated fair value 36,924  
Total unrealized losses (413)  
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 20,716 6,016
Less than 12 months, unrealized losses (418) (7)
12 months or more, estimated fair value 875 896
12 months or more, unrealized losses (6) (6)
Total estimated fair value 21,591 6,912
Total unrealized losses (424) (13)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Less than 12 months, estimated fair value 113,380 5,097
Less than 12 months, unrealized losses (1,841) (31)
12 months or more, estimated fair value 0 0
12 months or more, unrealized losses 0 0
Total estimated fair value 113,380 5,097
Total unrealized losses (1,841) (31)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 73,842 7,875
Less than 12 months, unrealized losses (1,309) (34)
12 months or more, estimated fair value 503 180
12 months or more, unrealized losses (3) (2)
Total estimated fair value 74,345 8,055
Total unrealized losses (1,312) (36)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 3,337 534
Less than 12 months, unrealized losses (91) (1)
12 months or more, estimated fair value 0 0
12 months or more, unrealized losses 0 0
Total estimated fair value 3,337 534
Total unrealized losses $ (91) $ (1)