Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings - Non Accruing Troubled Debt Restructuring [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	$ 39,923	$ 41,618
Payment Deferral [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	12,946	18,366
Rate Reduction and Payment Deferral [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	26,977	22,392
Rate Reduction [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs		860
Commercial Portfolio Segment [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	1,123	3,552
Commercial Portfolio Segment [Member] | Payment Deferral [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	1,033	1,423
Commercial Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	90	1,269
Commercial Portfolio Segment [Member] | Rate Reduction [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs		860
Real Estate Construction Portfolio Segment [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	15,806	19,462
Real Estate Construction Portfolio Segment [Member] | Payment Deferral [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	9,981
Real Estate Construction Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	5,825	19,462
Commercial Real Estate Portfolio Segment [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	21,906	16,890
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	1,544	15,917
Commercial Real Estate Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	20,362	973
Residential Portfolio Segment [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	1,088	1,714
Residential Portfolio Segment [Member] | Payment Deferral [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	388	1,026
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	$ 700	$ 688