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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Less than 12 months, estimated fair value $ 309,555 $ 19,522
Less than 12 months, unrealized losses (3,098) (73)
12 months or more, estimated fair value 896 1,076
12 months or more, unrealized losses (23) (8)
Total estimated fair value 310,451 20,598
Total unrealized losses (3,121) (81)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value 102,182  
Less than 12 months, unrealized losses (716)  
12 months or more, estimated fair value 0  
12 months or more, unrealized losses 0  
Total estimated fair value 102,182  
Total unrealized losses (716)  
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 29,722 6,016
Less than 12 months, unrealized losses (436) (7)
12 months or more, estimated fair value 0 896
12 months or more, unrealized losses 0 (6)
Total estimated fair value 29,722 6,912
Total unrealized losses (436) (13)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Less than 12 months, estimated fair value 100,746 5,097
Less than 12 months, unrealized losses (1,177) (31)
12 months or more, estimated fair value 0 0
12 months or more, unrealized losses 0 0
Total estimated fair value 100,746 5,097
Total unrealized losses (1,177) (31)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 67,527 7,875
Less than 12 months, unrealized losses (672) (34)
12 months or more, estimated fair value 896 180
12 months or more, unrealized losses (23) (2)
Total estimated fair value 68,423 8,055
Total unrealized losses (695) (36)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 9,378 534
Less than 12 months, unrealized losses (97) (1)
12 months or more, estimated fair value 0 0
12 months or more, unrealized losses 0 0
Total estimated fair value 9,378 534
Total unrealized losses $ (97) $ (1)