Note 3 - Loans (Details) - Allowance For Loan Losses And Recorded Investment In Loans By Portfolio Segment (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Commercial And Industrial [Member]	Jun. 30, 2012 Commercial And Industrial [Member]	Jun. 30, 2013 Commercial And Industrial [Member]	Jun. 30, 2012 Commercial And Industrial [Member]	Dec. 31, 2012 Commercial And Industrial [Member]	Jun. 30, 2013 Real Estate Mortgage [Member]	Jun. 30, 2012 Real Estate Mortgage [Member]	Jun. 30, 2013 Real Estate Mortgage [Member]	Jun. 30, 2012 Real Estate Mortgage [Member]	Dec. 31, 2012 Real Estate Mortgage [Member]	Jun. 30, 2013 Real Estate Construction [Member]	Jun. 30, 2012 Real Estate Construction [Member]	Jun. 30, 2013 Real Estate Construction [Member]	Jun. 30, 2012 Real Estate Construction [Member]	Dec. 31, 2012 Real Estate Construction [Member]	Jun. 30, 2013 Consumer And Other [Member]	Jun. 30, 2012 Consumer And Other [Member]	Jun. 30, 2013 Consumer And Other [Member]	Jun. 30, 2012 Consumer And Other [Member]	Dec. 31, 2012 Consumer And Other [Member]	Jun. 30, 2013 Unallocated [Member]	Jun. 30, 2012 Unallocated [Member]	Jun. 30, 2013 Unallocated [Member]	Jun. 30, 2012 Unallocated [Member]	Mar. 31, 2013 Period Beginning [Member]	Dec. 31, 2012 Period Beginning [Member]	Mar. 31, 2012 Period Beginning [Member]	Dec. 31, 2011 Period Beginning [Member]	Jun. 30, 2013 Period Ending [Member]	Jun. 30, 2012 Period Ending [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses beginning			$ 24,592			$ 7,053	$ 9,223	$ 8,255	$ 7,966		$ 13,217	$ 16,598	$ 14,748	$ 19,213		$ 180	$ 235	$ 216	$ 320		$ 79	$ 100	$ 143	$ 137		$ 2,303	$ 1,910	$ 1,230	$ 685	$ 22,832	$ 24,592	$ 28,066	$ 28,321	$ 21,832	$ 27,311
(Reduction in) provision for loan losses	(25)	200	(475)	600		394	(314)	(14)	1,609		1,027	47	(4)	(2,591)		(126)	633	(167)	529		(5)	20	(48)	14		(1,315)	(186)	(242)	1,039
Charge-offs	(1,113)	(1,657)	(2,572)	(2,823)		(2)	(10)	(886)	(794)		(1,095)	(945)	(1,645)	(1,285)		(9)	(683)	(9)	(683)		(7)	(19)	(32)	(61)		0	0	0	0
Recoveries	138	702	287	1,213		78	247	168	365		27	452	77	815		30	0	35	19		3	3	7	14		0	0	0	0
Allowance for loan losses ending	21,832		21,832			7,523	9,146	7,523	9,146		13,176	16,152	13,176	16,152		75	185	75	185		70	104	70	104		988	1,724	988	1,724	22,832	24,592	28,066	28,321	21,832	27,311
Ending allowance for loan losses balance for loans individually evaluated for impairment	654	816	654	816		464	26	464	26		190	790	190	790		0	0	0	0		0	0	0	0
Ending allowance for loan losses balance for loans collectively evaluated for impairment	20,190	24,771	20,190	24,771		7,059	9,120	7,059	9,120		12,986	15,362	12,986	15,362		75	185	75	185		70	104	70	104
Recorded investment in loans	1,181,537	1,097,588	1,181,537	1,097,588	1,103,478	438,838	376,173	438,838	376,173	383,905	732,555	708,699	732,555	708,699	702,480	4,665	7,711	4,665	7,711	9,692	5,479	5,005	5,479	5,005	7,401
Recorded investment in loans individually evaluated for impairment	16,558	34,086	16,558	34,086		1,680	8,386	1,680	8,386		14,878	20,182	14,878	20,182		0	5,517	0	5,517		0	1	0	1
Recorded investment in loans collectively evaluated for impairment	$ 1,164,979	$ 1,063,502	$ 1,164,979	$ 1,063,502		$ 437,158	$ 367,787	$ 437,158	$ 367,787		$ 717,677	$ 688,517	$ 717,677	$ 688,517		$ 4,665	$ 2,194	$ 4,665	$ 2,194		$ 5,479	$ 5,004	$ 5,479	$ 5,004