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Note 4 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Available-for-sale, less than 12 months, fair value $ 10,836 $ 66,069
Available-for-sale, less than 12 months, unrealized losses (92) (650)
Available-for-sale, 12 months or more, fair value 107,357 67,434
Available-for-sale, 12 months or more, unrealized losses (3,251) (1,447)
Held-to-maturity, less than 12 months, fair value 770 9,331
Held-to-maturity, less than 12 months, unrealized losses (68)
Held-to-maturity, 12 months or more, fair value 20,082 14,594
Held-to-maturity, 12 months or more, unrealized losses (610) (275)
Residential Mortgage Backed Securities [Member]    
Available-for-sale, less than 12 months, fair value 9,417 47,007
Available-for-sale, less than 12 months, unrealized losses (87) (467)
Available-for-sale, 12 months or more, fair value 53,507 21,122
Available-for-sale, 12 months or more, unrealized losses (1,430) (393)
Commercial Mortgage Backed Securities [Member]    
Available-for-sale, less than 12 months, fair value 461 18,554
Available-for-sale, less than 12 months, unrealized losses (3) (180)
Available-for-sale, 12 months or more, fair value 53,430 46,312
Available-for-sale, 12 months or more, unrealized losses (1,819) (1,054)
Held-to-maturity, less than 12 months, fair value 7,895
Held-to-maturity, less than 12 months, unrealized losses (63)
Held-to-maturity, 12 months or more, fair value 11,367 6,675
Held-to-maturity, 12 months or more, unrealized losses (349) (123)
US Government Agencies Debt Securities [Member]    
Held-to-maturity, less than 12 months, fair value 865
Held-to-maturity, less than 12 months, unrealized losses (2)
Held-to-maturity, 12 months or more, fair value 7,782 7,388
Held-to-maturity, 12 months or more, unrealized losses (244) (142)
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale, less than 12 months, fair value 879 428
Available-for-sale, less than 12 months, unrealized losses (2) (3)
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 770 571
Held-to-maturity, less than 12 months, unrealized losses (3)
Held-to-maturity, 12 months or more, fair value 933 531
Held-to-maturity, 12 months or more, unrealized losses (17) (10)
US Treasury Securities [Member]    
Available-for-sale, less than 12 months, fair value 79 80
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