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Note 3 - Securities - Securities in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Available-for-sale securities, less than 12 months, fair value $ 124,540 $ 121,822
Available-for-sale securities, less than 12 months, unrealized losses (3,579) (1,363)
Available-for-sale securities, 12 months or more, fair value 68,867 54,495
Available-for-sale securities, 12 months or more, unrealized losses (2,820) (1,310)
Available-for-sale securities, fair value 193,407 176,317
Available-for-sale securities, unrealized losses (6,399) (2,673)
US Government Agencies Debt Securities [Member]    
Available-for-sale securities, less than 12 months, fair value 23,263 18,140
Available-for-sale securities, less than 12 months, unrealized losses (431) (102)
Available-for-sale securities, 12 months or more, fair value 1,885 2,131
Available-for-sale securities, 12 months or more, unrealized losses (78) (44)
Available-for-sale securities, fair value 25,148 20,271
Available-for-sale securities, unrealized losses (509) (146)
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities, less than 12 months, fair value 14,930 15,030
Available-for-sale securities, less than 12 months, unrealized losses (426) (255)
Available-for-sale securities, 12 months or more, fair value 7,569 8,368
Available-for-sale securities, 12 months or more, unrealized losses (327) (223)
Available-for-sale securities, fair value 22,499 23,398
Available-for-sale securities, unrealized losses (753) (478)
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]    
Available-for-sale securities, less than 12 months, fair value 75,930 75,323
Available-for-sale securities, less than 12 months, unrealized losses (2,399) (827)
Available-for-sale securities, 12 months or more, fair value 43,898 31,036
Available-for-sale securities, 12 months or more, unrealized losses (1,855) (711)
Available-for-sale securities, fair value 119,828 106,359
Available-for-sale securities, unrealized losses (4,254) (1,538)
Corporate Debt Securities [Member]    
Available-for-sale securities, less than 12 months, fair value
Available-for-sale securities, less than 12 months, unrealized losses
Available-for-sale securities, 12 months or more, fair value 2,957 2,934
Available-for-sale securities, 12 months or more, unrealized losses (73) (105)
Available-for-sale securities, fair value 2,957 2,934
Available-for-sale securities, unrealized losses (73) (105)
Commercial Mortgage Backed Securities [Member]    
Available-for-sale securities, less than 12 months, fair value 10,417 11,162
Available-for-sale securities, less than 12 months, unrealized losses (323) (151)
Available-for-sale securities, 12 months or more, fair value 12,558 10,026
Available-for-sale securities, 12 months or more, unrealized losses (487) (227)
Available-for-sale securities, fair value 22,975 21,188
Available-for-sale securities, unrealized losses $ (810) (378)
Asset-backed Securities [Member]    
Available-for-sale securities, less than 12 months, fair value   2,167
Available-for-sale securities, less than 12 months, unrealized losses   (28)
Available-for-sale securities, 12 months or more, fair value  
Available-for-sale securities, 12 months or more, unrealized losses  
Available-for-sale securities, fair value   2,167
Available-for-sale securities, unrealized losses   $ (28)