Note 7 - Loans (Details) - Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Financing Receivable, Impaired [Line Items]
Impaired Loans - Average Recorded Investment	$ 190,744	$ 216,938	$ 192,752	$ 226,841
Impaired Loans - Interest Income Recognized	1,552	1,069	4,507	4,110
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans - Average Recorded Investment	21,706	32,187	26,741	24,873
Impaired Loans - Interest Income Recognized	205	166	636	395
Real Estate Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans - Average Recorded Investment	33,276	34,946	33,459	39,014
Impaired Loans - Interest Income Recognized	66	67	198	199
Commercial Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans - Average Recorded Investment	119,611	132,921	114,663	145,380
Impaired Loans - Interest Income Recognized	1,153	730	3,310	3,289
Residential Mortgage And Equity Lines Member
Financing Receivable, Impaired [Line Items]
Impaired Loans - Average Recorded Investment	16,151	16,884	17,889	17,574
Impaired Loans - Interest Income Recognized	$ 128	$ 106	$ 363	$ 227