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Note 4 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Available-for-sale, less than 12 months, fair value $ 262 $ 10,836
Available-for-sale, less than 12 months, unrealized losses (92)
Available-for-sale, 12 months or more, fair value 81,874 107,357
Available-for-sale, 12 months or more, unrealized losses (937) (3,251)
Held-to-maturity, less than 12 months, fair value 770
Held-to-maturity, less than 12 months, unrealized losses
Held-to-maturity, 12 months or more, fair value 17,291 20,082
Held-to-maturity, 12 months or more, unrealized losses (127) (610)
Residential Mortgage Backed Securities [Member]    
Available-for-sale, less than 12 months, fair value 180 9,417
Available-for-sale, less than 12 months, unrealized losses (87)
Available-for-sale, 12 months or more, fair value 40,760 53,507
Available-for-sale, 12 months or more, unrealized losses (334) (1,430)
Commercial Mortgage Backed Securities [Member]    
Available-for-sale, less than 12 months, fair value 2 461
Available-for-sale, less than 12 months, unrealized losses (3)
Available-for-sale, 12 months or more, fair value 41,114 53,430
Available-for-sale, 12 months or more, unrealized losses (603) (1,819)
Held-to-maturity, less than 12 months, fair value
Held-to-maturity, less than 12 months, unrealized losses
Held-to-maturity, 12 months or more, fair value 10,397 11,367
Held-to-maturity, 12 months or more, unrealized losses (86) (349)
US Government Agencies Debt Securities [Member]    
Held-to-maturity, less than 12 months, fair value
Held-to-maturity, less than 12 months, unrealized losses
Held-to-maturity, 12 months or more, fair value 6,386 7,782
Held-to-maturity, 12 months or more, unrealized losses (40) (244)
US Treasury Securities [Member]    
Available-for-sale, less than 12 months, fair value 80 79
Available-for-sale, less than 12 months, unrealized losses
Available-for-sale, 12 months or more, fair value
Available-for-sale, 12 months or more, unrealized losses
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale, less than 12 months, fair value   879
Available-for-sale, less than 12 months, unrealized losses   (2)
Available-for-sale, 12 months or more, fair value   420
Available-for-sale, 12 months or more, unrealized losses   (2)
Held-to-maturity, less than 12 months, fair value 770
Held-to-maturity, less than 12 months, unrealized losses
Held-to-maturity, 12 months or more, fair value 508 933
Held-to-maturity, 12 months or more, unrealized losses $ (1) $ (17)