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Note 4 - Securities - Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Securities in a Continuours Loss Position, Less Than 12 Months, Fair Value	$ 289,043	$ 295,295
Securities in a Continuours Loss Position, Less Than 12 Months, Unrealized Loss	5,255	7,232
Securities in a Continuours Loss Position, 12 Months or More, Fair Value	3,564	2,475
Securities in a Continuours Loss Position, 12 Months or More, Unrealized Loss	88	178
US Government Agencies Debt Securities [Member]
Securities in a Continuours Loss Position, Less Than 12 Months, Fair Value	264,648	260,150
Securities in a Continuours Loss Position, Less Than 12 Months, Unrealized Loss	4,645	6,161
Securities in a Continuours Loss Position, 12 Months or More, Fair Value	1,995	996
Securities in a Continuours Loss Position, 12 Months or More, Unrealized Loss	4	4
US States and Political Subdivisions Debt Securities [Member]
Securities in a Continuours Loss Position, Less Than 12 Months, Fair Value	21,505	31,257
Securities in a Continuours Loss Position, Less Than 12 Months, Unrealized Loss	483	934
Securities in a Continuours Loss Position, 12 Months or More, Fair Value	1,389	1,316
Securities in a Continuours Loss Position, 12 Months or More, Unrealized Loss	75	148
Corporate Debt Securities [Member]
Securities in a Continuours Loss Position, Less Than 12 Months, Fair Value	2,890	3,888
Securities in a Continuours Loss Position, Less Than 12 Months, Unrealized Loss	127	137
Securities in a Continuours Loss Position, 12 Months or More, Fair Value	0
Securities in a Continuours Loss Position, 12 Months or More, Unrealized Loss	0	0
Other Securities [Member]
Securities in a Continuours Loss Position, Less Than 12 Months, Fair Value	0
Securities in a Continuours Loss Position, Less Than 12 Months, Unrealized Loss	0
Securities in a Continuours Loss Position, 12 Months or More, Fair Value	180	163
Securities in a Continuours Loss Position, 12 Months or More, Unrealized Loss	$ 9	$ 26