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Note 2 - Debt Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Securities available for sale, less than 12 months, fair value $ 97,124 $ 42,349
Securities available for sale, less than 12 months, unrealized losses (1,079) (106)
Securities available for sale, 12 months or longer, fair value 23,242 25,267
Securities available for sale, 12 months or longer, unrealized losses (1,231) (925)
Securities available for sale, total fair value 120,366 67,616
Securities available for sale, total unrealized losses (2,310) (1,031)
US Government Agencies Debt Securities [Member]    
Securities available for sale, less than 12 months, fair value 10,054
Securities available for sale, less than 12 months, unrealized losses (10)
Securities available for sale, 12 months or longer, fair value
Securities available for sale, 12 months or longer, unrealized losses
Securities available for sale, total fair value 10,054
Securities available for sale, total unrealized losses (10)
US Treasury Securities [Member]    
Securities available for sale, less than 12 months, fair value 49,808 19,972
Securities available for sale, less than 12 months, unrealized losses (19) (16)
Securities available for sale, 12 months or longer, fair value
Securities available for sale, 12 months or longer, unrealized losses
Securities available for sale, total fair value 49,808 19,972
Securities available for sale, total unrealized losses (19) (16)
US States and Political Subdivisions Debt Securities [Member]    
Securities available for sale, less than 12 months, fair value 27,572 8,047
Securities available for sale, less than 12 months, unrealized losses (803) (55)
Securities available for sale, 12 months or longer, fair value 1,569 2,314
Securities available for sale, 12 months or longer, unrealized losses (106) (52)
Securities available for sale, total fair value 29,141 10,361
Securities available for sale, total unrealized losses (909) (107)
Single Issue Trust Preferred Securities [Member]    
Securities available for sale, less than 12 months, fair value
Securities available for sale, less than 12 months, unrealized losses
Securities available for sale, 12 months or longer, fair value 8,983 8,884
Securities available for sale, 12 months or longer, unrealized losses (391) (483)
Securities available for sale, total fair value 8,983 8,884
Securities available for sale, total unrealized losses (391) (483)
Mortgage-backed Agency Securities [Member]    
Securities available for sale, less than 12 months, fair value 19,744 4,276
Securities available for sale, less than 12 months, unrealized losses (257) (25)
Securities available for sale, 12 months or longer, fair value 12,690 14,069
Securities available for sale, 12 months or longer, unrealized losses (734) (390)
Securities available for sale, total fair value 32,434 18,345
Securities available for sale, total unrealized losses $ (991) $ (415)