Note 5 - Loans (Details) - Troubled Debt Restructuring by Type of Concession and Type of Loans (Accruing Troubled Debt Restructuring Member, USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Modifications [Line Items]
Accruing TDRs	$ 117,597,000	$ 144,695,000	$ 120,016,000
Principal Deferral [Member] | Commercial Loans Member
Financing Receivable, Modifications [Line Items]
Accruing TDRs	9,112,000	531,000	12,933,000
Principal Deferral [Member] | Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs			16,820,000
Principal Deferral [Member] | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	11,333,000	27,003,000	471,000
Principal Deferral [Member] | Residential Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	1,564,000	1,461,000	1,294,000
Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	22,009,000	28,995,000	31,518,000
Rate Reduction [Member] | Commercial Loans Member
Financing Receivable, Modifications [Line Items]
Accruing TDRs	2,916,000	3,020,000	1,756,000
Rate Reduction [Member] | Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs			9,659,000
Rate Reduction [Member] | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	9,389,000	16,656,000	37,796,000
Rate Reduction [Member] | Residential Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	1,024,000	1,024,000	587,000
Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	13,329,000	20,700,000	49,798,000
Rate Reduction and Forgiveness of Principal [Member] | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs		739,000	2,071,000
Rate Reduction and Forgiveness of Principal [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs		739,000	2,071,000
Rate Reduction and Payment Deferral [Member] | Commercial Loans Member
Financing Receivable, Modifications [Line Items]
Accruing TDRs	2,708,000	413,000	431,000
Rate Reduction and Payment Deferral [Member] | Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	5,834,000	5,834,000	5,776,000
Rate Reduction and Payment Deferral [Member] | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	70,200,000	85,783,000	28,935,000
Rate Reduction and Payment Deferral [Member] | Residential Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	3,517,000	2,231,000	1,487,000
Rate Reduction and Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	82,259,000	94,261,000	36,629,000
Commercial Loans Member
Financing Receivable, Modifications [Line Items]
Accruing TDRs	14,736,000	3,964,000	15,120,000
Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	5,834,000	5,834,000	32,255,000
Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	90,922,000	130,181,000	69,273,000
Residential Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	$ 6,105,000	$ 4,716,000	$ 3,368,000