Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings (Non Accruing Troubled Debt Restructuring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs	$ 44,541	$ 41,618
Payment Deferral [Member] | Commercial Loans [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs	2,323	1,423
Payment Deferral [Member] | Commercial Mortgage Loans [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs	12,344	15,917
Payment Deferral [Member] | Residential Mortgage Loans [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs	622	1,026
Payment Deferral [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs	15,289	18,366
Forgiveness of Principal [Member] | Commercial Loans [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs	1,144	860
Forgiveness of Principal [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs	1,144	860
Rate Reduction and Payment Deferral [Member] | Commercial Loans [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs		1,269
Rate Reduction and Payment Deferral [Member] | Commercial Mortgage Loans [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs	26,834	973
Rate Reduction and Payment Deferral [Member] | Residential Mortgage Loans [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs	1,274	688
Rate Reduction and Payment Deferral [Member] | Real Estate Construction Loans [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs		19,462
Rate Reduction and Payment Deferral [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs	28,108	22,392
Commercial Loans [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs	3,467	3,552
Commercial Mortgage Loans [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs	39,178	16,890
Residential Mortgage Loans [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs	1,896	1,714
Real Estate Construction Loans [Member]
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non Accrual TDRs		$ 19,462