Note 7 - Loans (Details) - Impaired Loans and Related Allowance for Credit Losses - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
With no allocated allowance
Loans with no related allowance, unpaid principal balance	$ 123,330	$ 129,970
Loans with no related allowance, recorded investment	93,597	86,374
Loans with related allowance, unpaid principal balance	44,891	50,398
Loans with related allowance, recorded investment	41,218	47,436
Allowance	7,190	7,749
Total impaired loans	168,221	180,368
Total impaired loans	134,815	133,810
Total impaired loans	7,190	7,749
Commercial Portfolio Segment [Member]
With no allocated allowance
Loans with no related allowance, unpaid principal balance	10,912	15,493
Loans with no related allowance, recorded investment	8,968	6,721
Loans with related allowance, unpaid principal balance	4,188	7,757
Loans with related allowance, recorded investment	2,718	6,847
Allowance	225	530
Total impaired loans	225	530
Real Estate Construction Portfolio Segment [Member]
With no allocated allowance
Loans with related allowance, unpaid principal balance	33,009	51,290
Loans with related allowance, recorded investment	11,857	22,002
Commercial Real Estate Portfolio Segment [Member]
With no allocated allowance
Loans with no related allowance, unpaid principal balance	74,480	59,954
Loans with no related allowance, recorded investment	67,988	54,625
Loans with related allowance, unpaid principal balance	27,369	28,258
Loans with related allowance, recorded investment	26,157	27,152
Allowance	6,593	6,792
Total impaired loans	6,593	6,792
Residential Mortgage and Equity Lines Portfolio Segment [Member]
With no allocated allowance
Loans with no related allowance, unpaid principal balance	4,929	3,233
Loans with no related allowance, recorded investment	4,784	3,026
Loans with related allowance, unpaid principal balance	13,334	14,383
Loans with related allowance, recorded investment	12,343	13,437
Allowance	372	427
Total impaired loans	$ 372	$ 427