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Note 5 - Securities (Details) - Fair Value and Associated Unrealized Losses on Investments - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value $ 41,394 $ 31,006
Available-for-sale securities, less than 12 months, unrealized losses (516) (166)
Available-for-sale securities, 12 months or more, fair value 14,703 22,884
Available-for-sale securities, 12 months or more, unrealized losses (360) (476)
Available-for-sale securities, fair value 56,097 53,890
Available-for-sale securities, unrealized losses (876) (642)
US Government Agencies Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 1,250  
Available-for-sale securities, less than 12 months, unrealized losses (3)  
Available-for-sale securities, 12 months or more, fair value   1,269
Available-for-sale securities, 12 months or more, unrealized losses   (16)
Available-for-sale securities, fair value 1,250 1,269
Available-for-sale securities, unrealized losses (3) (16)
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 5,431 3,952
Available-for-sale securities, less than 12 months, unrealized losses (100) (34)
Available-for-sale securities, 12 months or more, fair value   2,078
Available-for-sale securities, 12 months or more, unrealized losses   (20)
Available-for-sale securities, fair value 5,431 6,030
Available-for-sale securities, unrealized losses (100) (54)
Held-to-maturity securities:    
Held-to-maturity securities, less than 12 months, fair value 11,680 1,556
Held-to-maturity securities, less than 12 months, unrealized losses (329) (14)
Held-to-maturity securities, 12 months or more, fair value 5,130 12,726
Held-to-maturity securities, 12 months or more, unrealized losses (434) (386)
Held-to-maturity securities, fair value 16,810 14,282
Held-to-maturity securities, unrealized losses (763) (400)
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 10,113 10,193
Available-for-sale securities, less than 12 months, unrealized losses (175) (66)
Available-for-sale securities, 12 months or more, fair value 3,993 5,365
Available-for-sale securities, 12 months or more, unrealized losses (79) (103)
Available-for-sale securities, fair value 14,106 15,558
Available-for-sale securities, unrealized losses (254) (169)
Corporate Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 14,652 7,058
Available-for-sale securities, less than 12 months, unrealized losses (135) (36)
Available-for-sale securities, 12 months or more, fair value 3,475 6,542
Available-for-sale securities, 12 months or more, unrealized losses (53) (97)
Available-for-sale securities, fair value 18,127 13,600
Available-for-sale securities, unrealized losses (188) (133)
Commercial Mortgage Backed Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 5,273 4,912
Available-for-sale securities, less than 12 months, unrealized losses (76) (14)
Available-for-sale securities, 12 months or more, fair value 1,546 1,542
Available-for-sale securities, 12 months or more, unrealized losses (49) (59)
Available-for-sale securities, fair value 6,819 6,454
Available-for-sale securities, unrealized losses (125) (73)
Asset-backed Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 4,675 4,891
Available-for-sale securities, less than 12 months, unrealized losses (27) (16)
Available-for-sale securities, 12 months or more, fair value 5,689 6,088
Available-for-sale securities, 12 months or more, unrealized losses (179) (181)
Available-for-sale securities, fair value 10,364 10,979
Available-for-sale securities, unrealized losses $ (206) $ (197)