Note 11 - Fair Value Measurements - Financial Assets and Liabilities Measured On a Non-recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended				12 Months Ended
	Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016		Dec. 31, 2016		Dec. 31, 2015
Total Losses	$ 875		$ 1,155		$ 2,124		$ 1,392		$ 1,307		$ 2,507
Total at Fair Value	41,164				41,164				37,981
Fair Value, Inputs, Level 1 [Member]
Total at Fair Value
Fair Value, Inputs, Level 2 [Member]
Total at Fair Value	6,482				6,482				6,006
Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	34,682				34,682				31,975
Impaired Loans [Member]
Total Losses	497		945		1,523		945		322		1,550
Total at Fair Value	27,120				27,120				23,936
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Total at Fair Value
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Total at Fair Value
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	27,120				27,120				23,936
Impaired Loans [Member] | Commercial Portfolio Segment [Member]
Total Losses	497				1,273				322		806
Total at Fair Value	888				888				2,813
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Total at Fair Value
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Total at Fair Value
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	888				888				2,813
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Total Losses			945		250		945				598
Total at Fair Value	14,915				14,915				9,444
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Total at Fair Value
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Total at Fair Value
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	14,915				14,915				9,444
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member]
Total Losses											146
Total at Fair Value	11,317				11,317				11,679
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Total at Fair Value
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Total at Fair Value
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	11,317				11,317				11,679
Other Real Estate Owned [Member]
Total Losses	212	[1]	88	[1]	249	[1]	216	[1]	9	[2]	404	[2]
Total at Fair Value	10,804	[1]			10,804	[1]			10,378	[2]
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member]
Total at Fair Value		[1]				[1]				[2]
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member]
Total at Fair Value	6,482	[1]			6,482	[1]			6,006	[2]
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	4,322	[1]			4,322	[1]			4,372	[2]
Equity Investments [Member]
Total Losses	166		$ 122		352		$ 231		976		$ 553
Total at Fair Value	3,240				3,240				3,667
Equity Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Total at Fair Value
Equity Investments [Member] | Fair Value, Inputs, Level 2 [Member]
Total at Fair Value
Equity Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	$ 3,240				$ 3,240				$ 3,667

[1] Other real estate owned balance of $19.2 million in the condensed consolidated balance sheet is net of estimated disposal costs.

[2] Other real estate owned balance of $20.1 million in the Consolidated Balance Sheets is net of estimated disposal costs.