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Note 2 - Securities - Securities with Unrealized Losses Aggregated by Investment Category and Time with Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Less than 12 months, Fair Value $ 84,529 $ 191,926
Less than 12 months, Unrealized Losses 891 1,622
More than 12 months, Fair Value 9,994 925
More than 12 months, Unrealized Losses 6 4
Total, Fair Value 94,523 192,851
Total, Unrealized Losses 897 1,626
Less than 12 months, Unrealized Losses (891) (1,622)
More than 12 months, Unrealized Losses (6) (4)
Total, Unrealized Losses (897) (1,626)
US Treasury and Government [Member]    
Less than 12 months, Fair Value 0 7,175
Less than 12 months, Unrealized Losses 0 39
More than 12 months, Fair Value 0 0
More than 12 months, Unrealized Losses 0 (0)
Total, Fair Value 0 7,175
Total, Unrealized Losses 0 39
Less than 12 months, Unrealized Losses 0 (39)
More than 12 months, Unrealized Losses 0 0
Total, Unrealized Losses 0 (39)
US Treasury Securities [Member]    
Less than 12 months, Fair Value 0 0
Less than 12 months, Unrealized Losses 0 (0)
More than 12 months, Fair Value 0 0
More than 12 months, Unrealized Losses 0 (0)
Total, Fair Value 0 0
Total, Unrealized Losses 0 (0)
Less than 12 months, Unrealized Losses 0 0
More than 12 months, Unrealized Losses 0 0
Total, Unrealized Losses 0 0
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, Fair Value 8,950 75,099
Less than 12 months, Unrealized Losses 24 1,256
More than 12 months, Fair Value 0 252
More than 12 months, Unrealized Losses 0 1
Total, Fair Value 8,950 75,351
Total, Unrealized Losses 24 1,257
Less than 12 months, Unrealized Losses (24) (1,256)
More than 12 months, Unrealized Losses 0 (1)
Total, Unrealized Losses (24) (1,257)
Collateralized Mortgage Backed Securities [Member]    
Less than 12 months, Fair Value 75,126 109,652
Less than 12 months, Unrealized Losses 866 327
More than 12 months, Fair Value 9,994 373
More than 12 months, Unrealized Losses 6 2
Total, Fair Value 85,120 110,025
Total, Unrealized Losses 872 329
Less than 12 months, Unrealized Losses (866) (327)
More than 12 months, Unrealized Losses (6) (2)
Total, Unrealized Losses (872) (329)
Corporate Debt Securities [Member]    
Less than 12 months, Fair Value 453 0
Less than 12 months, Unrealized Losses 1 (0)
More than 12 months, Fair Value 0 300
More than 12 months, Unrealized Losses 0 1
Total, Fair Value 453 300
Total, Unrealized Losses 1 1
Less than 12 months, Unrealized Losses (1) 0
More than 12 months, Unrealized Losses 0 (1)
Total, Unrealized Losses $ (1) $ (1)