Note 4 - Loans and Allowance for Credit Losses (Details) - Impaired Loans (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	$ 37,824	$ 41,206	$ 48,322
Recorded Investment With No Allowance	16,135	23,802	30,760
Recorded Investment With Allowance	21,389	17,404	15,237
Total Recorded Investment	37,524	41,206	45,997
Related Allowance	7,160	7,297	8,114
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	9,607	7,282	9,461
Recorded Investment With No Allowance	2,442	3,587	5,767
Recorded Investment With Allowance	7,165	3,695	3,481
Total Recorded Investment	9,607	7,282	9,248
Related Allowance	3,019	2,256	2,158
Commercial Loan [Member] | Quarter To Date [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	10,184	6,622	8,372
Average Recorded Investment - Year	10,184	6,622	8,372
Interest Income Recognized - Quarter	(7)	48	151
Interest Income Recognized - Year	(7)	48	151
Commercial Loan [Member] | Year To Date [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	9,402	8,080	7,772
Average Recorded Investment - Year	9,402	8,080	7,772
Interest Income Recognized - Quarter	78	94	245
Interest Income Recognized - Year	78	94	245
Commercial Real Estate Investment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	6,464	5,789	5,600
Recorded Investment With No Allowance	1,451	3,830	3,830
Recorded Investment With Allowance	5,013	1,959	1,770
Total Recorded Investment	6,464	5,789	5,600
Related Allowance	1,097	863	1,201
Commercial Real Estate Investment [Member] | Quarter To Date [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	5,934	5,840	5,695
Average Recorded Investment - Year	5,934	5,840	5,695
Interest Income Recognized - Quarter	62	38	38
Interest Income Recognized - Year	62	38	38
Commercial Real Estate Investment [Member] | Year To Date [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	5,719	8,010	6,609
Average Recorded Investment - Year	5,719	8,010	6,609
Interest Income Recognized - Quarter	137	114	152
Interest Income Recognized - Year	137	114	152
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	6,426	2,374	6,659
Recorded Investment With No Allowance	5,530	1,315	5,602
Recorded Investment With Allowance	896	1,059	1,057
Total Recorded Investment	6,426	2,374	6,659
Related Allowance	823	413	753
Commercial Real Estate Owner Occupied [Member] | Quarter To Date [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	6,432	2,024	4,517
Average Recorded Investment - Year	6,432	2,024	4,517
Interest Income Recognized - Quarter	(43)	39	213
Interest Income Recognized - Year	(43)	39	213
Commercial Real Estate Owner Occupied [Member] | Year To Date [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	6,493	1,152	2,746
Average Recorded Investment - Year	6,493	1,152	2,746
Interest Income Recognized - Quarter	56	39	252
Interest Income Recognized - Year	56	39	252
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	895	713	699
Recorded Investment With No Allowance	783	713	699
Recorded Investment With Allowance	112
Total Recorded Investment	895	713	699
Related Allowance	27
Residential Mortgage [Member] | Quarter To Date [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	843	714	706
Average Recorded Investment - Year	843	714	706
Residential Mortgage [Member] | Year To Date [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	769	800	714
Average Recorded Investment - Year	769	800	714
Home Equity Line of Credit [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	511	670	513
Recorded Investment With No Allowance	37	132	134
Recorded Investment With Allowance	474	538	379
Total Recorded Investment	511	670	513
Related Allowance	373	380	243
Home Equity Line of Credit [Member] | Quarter To Date [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	461	547	592
Average Recorded Investment - Year	461	547	592
Interest Income Recognized - Quarter	2	8	1
Interest Income Recognized - Year	2	8	1
Home Equity Line of Credit [Member] | Year To Date [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	479	562	534
Average Recorded Investment - Year	479	562	534
Interest Income Recognized - Quarter	2	8	9
Interest Income Recognized - Year	2	8	9
Consumer, Other [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	45	7	43
Recorded Investment With No Allowance			1
Recorded Investment With Allowance	45	7	42
Total Recorded Investment	45	7	43
Related Allowance	45	4	41
Consumer, Other [Member] | Quarter To Date [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	28	8	25
Average Recorded Investment - Year	28	8	25
Interest Income Recognized - Quarter	1		2
Interest Income Recognized - Year	1		2
Consumer, Other [Member] | Year To Date [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	25	8	17
Average Recorded Investment - Year	25	8	17
Interest Income Recognized - Quarter	1		2
Interest Income Recognized - Year	1		2
Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	13,876	24,371	25,347
Recorded Investment With No Allowance	5,892	14,225	14,727
Recorded Investment With Allowance	7,684	10,146	8,508
Total Recorded Investment	13,576	24,371	23,235
Related Allowance	1,776	3,381	3,718
Quarter To Date [Member] | Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	14,033	25,680	24,859
Average Recorded Investment - Year	14,033	25,680	24,859
Interest Income Recognized - Quarter	41	56	63
Interest Income Recognized - Year	41	56	63
Quarter To Date [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	37,915	41,435	44,766
Average Recorded Investment - Year	37,915	41,435	44,766
Interest Income Recognized - Quarter	56	189	468
Interest Income Recognized - Year	56	189	468
Year To Date [Member] | Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	18,315	25,796	26,430
Average Recorded Investment - Year	18,315	25,796	26,430
Interest Income Recognized - Quarter	125	139	202
Interest Income Recognized - Year	125	139	202
Year To Date [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment - Quarter	41,202	44,408	44,822
Average Recorded Investment - Year	41,202	44,408	44,822
Interest Income Recognized - Quarter	399	394	862
Interest Income Recognized - Year	$ 399	$ 394	$ 862