Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings - Non Accruing Troubled Debt Restructuring [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	$ 23,209	$ 39,923
Payment Deferral [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	2,914	12,946
Rate Reduction and Payment Deferral [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	20,295	26,977
Commercial Portfolio Segment [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	1,091	1,123
Commercial Portfolio Segment [Member] | Payment Deferral [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	1,001	1,033
Commercial Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	90	90
Real Estate Construction Portfolio Segment [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	21,560	15,806
Real Estate Construction Portfolio Segment [Member] | Payment Deferral [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	1,532	9,981
Real Estate Construction Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	20,028	5,825
Residential Portfolio Segment [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	558	1,088
Residential Portfolio Segment [Member] | Payment Deferral [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	381	388
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	$ 177	700
Commercial Real Estate Portfolio Segment [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs		21,906
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs		1,544
Commercial Real Estate Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs		$ 20,362