Note 4 - Loans and Allowance for Credit Losses (Details) - Allowance For Credit Losses By Portfolio Segment (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$ 39,640	$ 34,079	$ 37,492	$ 29,653
Loans charged-off	(1,420)	(2,252)	(5,734)	(6,762)
Recoveries of loans previously charged-off	95	117	835	640
Net loan charged-off	(1,325)	(2,135)	(4,899)	(6,122)
Provision for credit losses	1,372	3,638	7,094	12,051
Ending balance	39,687	35,582	39,687	35,582
For the Period Ended September 30, 2013
Individually evaluated for impairment	7,160	7,297	7,160	7,297
Collectively evaluated for impairment	32,527	28,285	32,527	28,285
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	12,177	8,878	9,412	9,609
Loans charged-off	(966)	(70)	(3,380)	(1,831)
Recoveries of loans previously charged-off	89	41	139	69
Net loan charged-off	(877)	(29)	(3,241)	(1,762)
Provision for credit losses	346	519	5,475	1,521
Ending balance	11,646	9,368	11,646	9,368
For the Period Ended September 30, 2013
Individually evaluated for impairment	3,019	2,256	3,019	2,256
Collectively evaluated for impairment	8,627	7,112	8,627	7,112
Commercial Real Estate Investment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	9,615	8,720	9,148	7,304
Loans charged-off	(118)		(227)	(1,189)
Recoveries of loans previously charged-off				18
Net loan charged-off	(118)		(227)	(1,171)
Provision for credit losses	359	3	935	2,590
Ending balance	9,856	8,723	9,856	8,723
For the Period Ended September 30, 2013
Individually evaluated for impairment	1,097	863	1,097	863
Collectively evaluated for impairment	8,759	7,860	8,759	7,860
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	3,024	2,390	2,781	1,898
Loans charged-off		(350)		(350)
Net loan charged-off		(350)		(350)
Provision for credit losses	(37)	451	206	943
Ending balance	2,987	2,491	2,987	2,491
For the Period Ended September 30, 2013
Individually evaluated for impairment	823	413	823	413
Collectively evaluated for impairment	2,164	2,078	2,164	2,078
Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	942		659	399
Loans charged-off				(300)
Net loan charged-off				(300)
Provision for credit losses	(332)		(49)	(99)
Ending balance	610		610
For the Period Ended September 30, 2013
Individually evaluated for impairment	27		27
Collectively evaluated for impairment	583		583
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	1,765	1,433	1,730	1,528
Loans charged-off	(25)	(250)	(54)	(511)
Recoveries of loans previously charged-off		70	9	71
Net loan charged-off	(25)	(180)	(45)	(440)
Provision for credit losses	5	449	60	614
Ending balance	1,745	1,702	1,745	1,702
For the Period Ended September 30, 2013
Individually evaluated for impairment	373	380	373	380
Collectively evaluated for impairment	1,372	1,322	1,372	1,322
Consumer, Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	369	174	371	369
Loans charged-off	(11)	(28)	(63)	(37)
Recoveries of loans previously charged-off			6	2
Net loan charged-off	(11)	(28)	(57)	(35)
Provision for credit losses	5	149	49	(39)
Ending balance	363	295	363	295
For the Period Ended September 30, 2013
Individually evaluated for impairment	45	4	45	4
Collectively evaluated for impairment	318	291	318	291
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	11,748	12,484	13,391	8,546
Loans charged-off	(300)	(1,554)	(2,010)	(2,544)
Recoveries of loans previously charged-off	6	6	681	480
Net loan charged-off	(294)	(1,548)	(1,329)	(2,064)
Provision for credit losses	1,026	2,067	418	6,521
Ending balance	12,480	13,003	12,480	13,003
For the Period Ended September 30, 2013
Individually evaluated for impairment	1,776	3,381	1,776	3,381
Collectively evaluated for impairment	$ 10,704	$ 9,622	$ 10,704	$ 9,622