Note 6 - Loans and Allowance for Credit Losses (Details) - Allowance for Credit Losses by Portfolio Segment (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$ 42,018	$ 38,811	$ 40,921	$ 37,492
Loans charged-off	(1,690)	(2,231)	(2,815)	(4,314)
Recoveries of loans previously charged-off	90	703	378	740
Net loan charged-off	(1,600)	(1,528)	(2,437)	(3,574)
Provision for credit losses	3,134	2,357	5,068	5,722
Ending balance	43,552	39,640	43,552	39,640
For the Period Ended June 30, 2014
Individually evaluated for impairment	7,148	7,204	7,148	7,204
Collectively evaluated for impairment	36,404	32,436	36,404	32,436
Ending balance	43,552	39,640	43,552	39,640	40,921
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	11,420	11,075	9,780	9,412
Loans charged-off	(1,378)	(1,230)	(1,651)	(2,414)
Recoveries of loans previously charged-off	72	24	283	50
Net loan charged-off	(1,306)	(1,206)	(1,368)	(2,364)
Provision for credit losses	1,299	2,308	3,001	5,129
Ending balance	11,413	12,177	11,413	12,177
For the Period Ended June 30, 2014
Individually evaluated for impairment	3,501	3,416	3,501	3,416
Collectively evaluated for impairment	7,912	8,761	7,912	8,761
Ending balance	11,413	12,177	11,413	12,177
Commercial Real Estate Investment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	10,590	9,007	10,359	9,148
Loans charged-off				(109)
Recoveries of loans previously charged-off	4		4
Net loan charged-off	4		4	(109)
Provision for credit losses	151	608	382	576
Ending balance	10,745	9,615	10,745	9,615
For the Period Ended June 30, 2014
Individually evaluated for impairment	732	1,040	732	1,040
Collectively evaluated for impairment	10,013	8,575	10,013	8,575
Ending balance	10,745	9,615	10,745	9,615
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	3,195	2,804	3,899	2,781
Loans charged-off			(35)
Recoveries of loans previously charged-off	7		7
Net loan charged-off	7		(28)
Provision for credit losses	71	220	(598)	243
Ending balance	3,273	3,024	3,273	3,024
For the Period Ended June 30, 2014
Individually evaluated for impairment	1,102	1,025	1,102	1,025
Collectively evaluated for impairment	2,171	1,999	2,171	1,999
Ending balance	3,273	3,024	3,273	3,024
Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	754	877	944	659
Loans charged-off	(28)		(90)
Net loan charged-off	(28)		(90)
Provision for credit losses	232	65	104	283
Ending balance	958	942	958	942
For the Period Ended June 30, 2014
Collectively evaluated for impairment	958	942	958	942
Ending balance	958	942	958	942
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	1,507	1,752	1,871	1,730
Loans charged-off			(149)	(29)
Recoveries of loans previously charged-off	1	9	6	9
Net loan charged-off	1	9	(143)	(20)
Provision for credit losses	(177)	4	(397)	55
Ending balance	1,331	1,765	1,331	1,765
For the Period Ended June 30, 2014
Individually evaluated for impairment	208	317	208	317
Collectively evaluated for impairment	1,123	1,448	1,123	1,448
Ending balance	1,331	1,765	1,331	1,765
Consumer, Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	373	351	134	371
Loans charged-off	(59)	(10)	(84)	(52)
Recoveries of loans previously charged-off		1	7	6
Net loan charged-off	(59)	(9)	(77)	(46)
Provision for credit losses	31	27	288	44
Ending balance	345	369	345	369
For the Period Ended June 30, 2014
Individually evaluated for impairment		10		10
Collectively evaluated for impairment	345	359	345	359
Ending balance	345	369	345	369
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	14,179	12,945	13,934	13,391
Loans charged-off	(225)	(991)	(806)	(1,710)
Recoveries of loans previously charged-off	6	669	71	675
Net loan charged-off	(219)	(322)	(735)	(1,035)
Provision for credit losses	1,527	(875)	2,288	(608)
Ending balance	15,487	11,748	15,487	11,748
For the Period Ended June 30, 2014
Individually evaluated for impairment	1,605	1,396	1,605	1,396
Collectively evaluated for impairment	13,882	10,352	13,882	10,352
Ending balance	$ 15,487	$ 11,748	$ 15,487	$ 11,748