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Note 3 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale, less than 12 months, fair value $ 66,069,000 $ 142,723,000
Available-for-sale, less than 12 months, unrealized losses (650,000) (2,936,000)
Available-for-sale, 12 months or more, fair value 67,434,000 12,625,000
Available-for-sale, 12 months or more, unrealized losses (1,447,000) (368,000)
Held-to-maturity, less than 12 months, fair value 9,331,000 22,361,000
Held-to-maturity, less than 12 months, unrealized losses (68,000) (416,000)
Held-to-maturity, 12 months or more, fair value 14,594,000
Held-to-maturity, 12 months or more, unrealized losses (275,000)
Residential Mortgage Backed Securities [Member]    
Available-for-sale, less than 12 months, fair value 47,007,000 85,741,000
Available-for-sale, less than 12 months, unrealized losses (467,000) (1,976,000)
Available-for-sale, 12 months or more, fair value 21,122,000 1,904,000
Available-for-sale, 12 months or more, unrealized losses (393,000) (27,000)
Commercial Mortgage Backed Securities [Member]    
Available-for-sale, less than 12 months, fair value 18,554,000 54,475,000
Available-for-sale, less than 12 months, unrealized losses (180,000) (946,000)
Available-for-sale, 12 months or more, fair value 46,312,000 10,721,000
Available-for-sale, 12 months or more, unrealized losses (1,054,000) (341,000)
Held-to-maturity, less than 12 months, fair value 7,895,000 12,776,000
Held-to-maturity, less than 12 months, unrealized losses (63,000) (148,000)
Held-to-maturity, 12 months or more, fair value 6,675,000
Held-to-maturity, 12 months or more, unrealized losses (123,000)
US Government Agencies Debt Securities [Member]    
Available-for-sale, less than 12 months, fair value   1,993,000
Available-for-sale, less than 12 months, unrealized losses   (7,000)
Available-for-sale, 12 months or more, fair value  
Available-for-sale, 12 months or more, unrealized losses  
Held-to-maturity, less than 12 months, fair value 865,000 7,957,000
Held-to-maturity, less than 12 months, unrealized losses (2,000) (222,000)
Held-to-maturity, 12 months or more, fair value 7,388,000
Held-to-maturity, 12 months or more, unrealized losses (142,000)
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale, less than 12 months, fair value 428 434,000
Available-for-sale, less than 12 months, unrealized losses (3) (7,000)
Available-for-sale, 12 months or more, fair value
Available-for-sale, 12 months or more, unrealized losses
Held-to-maturity, less than 12 months, fair value 571,000 1,628,000
Held-to-maturity, less than 12 months, unrealized losses (3,000) (46,000)
Held-to-maturity, 12 months or more, fair value 531,000
Held-to-maturity, 12 months or more, unrealized losses (10,000)
US Treasury Securities [Member]    
Available-for-sale, less than 12 months, fair value 80,000 80,000
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