Note 15 - Fair Value Measurements - Financial Assets and Liabilities Measured On a Non-recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Total at Fair Value	$ 37,981		$ 58,889
Total Losses	1,307		2,507		$ 4,596
Fair Value, Inputs, Level 1 [Member]
Total at Fair Value
Fair Value, Inputs, Level 2 [Member]
Total at Fair Value	6,006		10,047
Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	31,975		48,842
Impaired Loans [Member]
Total at Fair Value	23,936		39,685
Total Losses	322		1,550		3,958
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	23,936		39,685
Impaired Loans [Member] | Commercial Portfolio Segment [Member]
Total at Fair Value	2,813		6,317
Total Losses	322		806		17
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	2,813		6,317
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Total at Fair Value	9,444		20,359
Total Losses			598		3,914
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	9,444		20,359
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member]
Total at Fair Value	11,679		13,009
Total Losses			146		27
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	11,679		13,009
Other Real Estate Owned [Member]
Total at Fair Value	10,378	[1]	14,282	[2]
Total Losses	9	[1]	404	[2]	202	[2]
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member]
Total at Fair Value		[1]		[2]
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member]
Total at Fair Value	6,006	[1]	10,047	[2]
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Total at Fair Value	4,372	[1]	4,235	[2]
Equity Investments [Member]
Total at Fair Value	3,667		4,922
Total Losses	976		553		$ 436
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	$ 3,667		$ 4,922

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

[2] Other real estate owned balance of $24.7 million in the Consolidated Balance Sheets is net of estimated disposal costs.