Note 7 - Loans (Details) - Allowance for Loan Losses by Portfolio Segment - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	$ 156,089	$ 169,138	$ 161,420	$ 173,889
Provision/(reversal) for possible loan losses	(2,150)	(3,700)	(7,150)	(4,071)
Charge-offs	(2,658)	(2,575)	(7,121)	(11,577)
Recoveries	2,156	6,214	6,288	10,836
Net charge-offs	(502)	3,639	(833)	(741)
Balance	153,437	169,077	153,437	169,077
Reserve to impaired loans	7,984	9,609	7,984	9,609
Reserve to non-impaired loans	145,453	159,468	145,453	159,468
Reserve for off-balance sheet credit commitments		1,844		1,844
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	49,705	64,782	47,501	65,103
Provision/(reversal) for possible loan losses	184	(6,111)	1,005	(1,228)
Charge-offs	(2,580)	(114)	(3,444)	(7,340)
Recoveries	231	4,682	2,478	6,704
Net charge-offs	(2,349)	4,568	(966)	(636)
Balance	47,540	63,239	47,540	63,239
Reserve to impaired loans	966	2,717	966	2,717
Reserve to non-impaired loans	46,574	60,522	46,574	60,522
Reserve for off-balance sheet credit commitments		1,014		1,014
Real Estate Construction Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	23,270	10,626	27,652	11,999
Provision/(reversal) for possible loan losses	2,982	742	(1,470)	(656)
Charge-offs		(1,813)		(1,813)
Recoveries	52		122	25
Net charge-offs	52	(1,813)	122	(1,788)
Balance	26,304	9,555	26,304	9,555
Reserve to impaired loans		143		143
Reserve to non-impaired loans	26,304	9,412	26,304	9,412
Reserve for off-balance sheet credit commitments		391		391
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	71,318	81,326	74,673	84,753
Provision/(reversal) for possible loan losses	(5,880)	1,185	(7,580)	(3,041)
Charge-offs	(65)	(648)	(3,516)	(2,424)
Recoveries	1,872	1,532	3,668	4,107
Net charge-offs	1,807	884	152	1,683
Balance	67,245	83,395	67,245	83,395
Reserve to impaired loans	6,554	6,230	6,554	6,230
Reserve to non-impaired loans	60,691	77,165	60,691	77,165
Reserve for off-balance sheet credit commitments		401		401
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	11,777	12,377	11,578	12,005
Provision/(reversal) for possible loan losses	559	493	886	865
Charge-offs	(13)		(161)
Recoveries			20
Net charge-offs	(13)		(141)
Balance	12,323	12,870	12,323	12,870
Reserve to impaired loans	464	519	464	519
Reserve to non-impaired loans	11,859	12,351	11,859	12,351
Reserve for off-balance sheet credit commitments		36		36
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	19	27	16	29
Provision/(reversal) for possible loan losses	5	(9)	9	(11)
Recoveries	1
Net charge-offs	1
Balance	25	18	25	18
Reserve to impaired loans	0		0
Reserve to non-impaired loans	$ 25	18	$ 25	18
Reserve for off-balance sheet credit commitments		$ 2		$ 2