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Note 3 - Investment Securities - Investments' Gross Unrealized Losses and Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-Sale, Less than 12 Months, Fair Value $ 142,723 $ 111,208
Available-for-Sale, Less than 12 Months, Unrealized Losses (2,936) (751)
Available-for-Sale, 12 Months or More, Fair Value 12,625 17,979
Available-for-Sale, 12 Months or More, Unrealized Losses (368) (494)
Held-to-Maturity, Less than 12 Months, Fair Value 22,361 25,878
Held-to-Maturity, Less than 12 Months, Unrealized Losses (416) (218)
Held-to-Maturity, 12 Months or More, Unrealized Losses (1,560)
Held-to-Maturity, 12 Months or More, Fair Value 1,560
Held-to-Maturity, 12 Months or More, Unrealized Losses (27)
Residential Mortgage Backed Securities [Member]    
Available-for-Sale, Less than 12 Months, Fair Value 85,741 83,403
Available-for-Sale, Less than 12 Months, Unrealized Losses (1,976) (458)
Available-for-Sale, 12 Months or More, Fair Value 1,904 9,061
Available-for-Sale, 12 Months or More, Unrealized Losses (27) (150)
Commercial Mortgage Backed Securities [Member]    
Available-for-Sale, Less than 12 Months, Fair Value 54,475 24,337
Available-for-Sale, Less than 12 Months, Unrealized Losses (946) (272)
Available-for-Sale, 12 Months or More, Fair Value 10,721 8,918
Available-for-Sale, 12 Months or More, Unrealized Losses (341) (344)
Held-to-Maturity, Less than 12 Months, Fair Value 12,776 14,143
Held-to-Maturity, Less than 12 Months, Unrealized Losses (148) (170)
Held-to-Maturity, 12 Months or More, Unrealized Losses
Held-to-Maturity, 12 Months or More, Fair Value
Held-to-Maturity, 12 Months or More, Unrealized Losses  
US Government Agencies Debt Securities [Member]    
Available-for-Sale, Less than 12 Months, Fair Value 1,993 1,982
Available-for-Sale, Less than 12 Months, Unrealized Losses (7) (17)
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 7,957 11,163
Held-to-Maturity, Less than 12 Months, Unrealized Losses (222) (44)
Held-to-Maturity, 12 Months or More, Unrealized Losses (1,560)
Held-to-Maturity, 12 Months or More, Fair Value 1,560
Held-to-Maturity, 12 Months or More, Unrealized Losses (27)
US States and Political Subdivisions Debt Securities [Member]    
Available-for-Sale, Less than 12 Months, Fair Value 434 707
Available-for-Sale, Less than 12 Months, Unrealized Losses (7) (4)
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 1,628 572
Held-to-Maturity, Less than 12 Months, Unrealized Losses (46) (4)
Held-to-Maturity, 12 Months or More, Unrealized Losses
Held-to-Maturity, 12 Months or More, Fair Value
Held-to-Maturity, 12 Months or More, Unrealized Losses
Corporate Debt Securities [Member]    
Available-for-Sale, Less than 12 Months, Fair Value   779
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 Treasury Securities [Member]    
Available-for-Sale, Less than 12 Months, Fair Value 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