Note 7 - Loans (Details) - Average Balance and Interest Income Recognized Related to Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Impaired [Line Items]
Impaired Loans - Average Recorded Investment	$ 195,365	$ 244,248
Impaired Loans - Interest Income Recognized	1,520	1,895
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans - Average Recorded Investment	30,844	22,126
Impaired Loans - Interest Income Recognized	226	183
Real Estate Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans - Average Recorded Investment	34,060	42,068
Impaired Loans - Interest Income Recognized	65	66
Commercial Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans - Average Recorded Investment	111,305	162,257
Impaired Loans - Interest Income Recognized	1,134	1,562
Residential Mortgage And Equity Lines Member
Financing Receivable, Impaired [Line Items]
Impaired Loans - Average Recorded Investment	19,156	17,797
Impaired Loans - Interest Income Recognized	$ 95	$ 84