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		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Commercial And Industrial [Member]	Sep. 30, 2012 Commercial And Industrial [Member]	Sep. 30, 2013 Commercial And Industrial [Member]	Sep. 30, 2012 Commercial And Industrial [Member]	Dec. 31, 2012 Commercial And Industrial [Member]	Sep. 30, 2013 Real Estate Mortgage [Member]	Sep. 30, 2012 Real Estate Mortgage [Member]	Sep. 30, 2013 Real Estate Mortgage [Member]	Sep. 30, 2012 Real Estate Mortgage [Member]	Dec. 31, 2012 Real Estate Mortgage [Member]	Sep. 30, 2013 Real Estate Construction [Member]	Sep. 30, 2012 Real Estate Construction [Member]	Sep. 30, 2013 Real Estate Construction [Member]	Sep. 30, 2012 Real Estate Construction [Member]	Dec. 31, 2012 Real Estate Construction [Member]	Sep. 30, 2013 Consumer And Other [Member]	Sep. 30, 2012 Consumer And Other [Member]	Sep. 30, 2013 Consumer And Other [Member]	Sep. 30, 2012 Consumer And Other [Member]	Dec. 31, 2012 Consumer And Other [Member]	Sep. 30, 2013 Unallocated [Member]	Sep. 30, 2012 Unallocated [Member]	Sep. 30, 2013 Unallocated [Member]	Sep. 30, 2012 Unallocated [Member]	Jun. 30, 2013 Period Beginning [Member]	Dec. 31, 2012 Period Beginning [Member]	Jun. 30, 2012 Period Beginning [Member]	Dec. 31, 2011 Period Beginning [Member]	Sep. 30, 2013 Period Ending [Member]	Sep. 30, 2012 Period Ending [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses beginning			$ 24,592			$ 7,523	$ 9,146	$ 8,255	$ 7,966		$ 13,176	$ 16,151	$ 14,748	$ 19,213		$ 75	$ 185	$ 216	$ 320		$ 70	$ 106	$ 143	$ 137		$ 988	$ 1,723	$ 1,230	$ 685	$ 21,832	$ 24,592	$ 27,311	$ 28,321	$ 20,800	$ 25,542
(Reduction in) provision for loan losses	(655)	(300)	(1,130)	300		(31)	922	(45)	2,531		(918)	(574)	(923)	(3,166)		72	(6)	(95)	523		(11)	50	(58)	66		233	(692)	(9)	346
Charge-offs	(517)	(1,625)	(3,089)	(4,448)		(450)	(1,464)	(1,336)	(2,258)		(41)	(130)	(1,685)	(1,415)		(17)		(26)	(683)		(9)	(31)	(42)	(92)		0	0	0	0
Recoveries	140	156	427	1,369		124	32	292	397		14	118	91	933			0	35	19		2	6	9	20		0	0	0	0
Allowance for loan losses ending	20,800		20,800			7,166	8,636	7,166	8,636		12,231	15,565	12,231	15,565		130	179	130	179		52	131	52	131		1,221	1,031	1,221	1,031	21,832	24,592	27,311	28,321	20,800	25,542
Ending allowance for loan losses balance for loans individually evaluated for impairment	174	976	174	976			23		23		174	953	174	953		0	0	0	0		0	0	0	0
Ending allowance for loan losses balance for loans collectively evaluated for impairment	19,405	23,535	19,405	23,535		7,166	8,613	7,166	8,613		12,057	14,612	12,057	14,612		130	179	130	179		52	131	52	131
Recorded investment in loans	1,187,850	1,100,060	1,187,850	1,100,060	1,103,478	439,601	377,309	439,601	377,309	383,905	735,280	708,121	735,280	708,121	702,480	8,607	7,907	8,607	7,907	9,692	4,362	6,723	4,362	6,723	7,401
Recorded investment in loans individually evaluated for impairment	15,404	40,291	15,404	40,291		1,441	7,357	1,441	7,357		13,963	27,441	13,963	27,441		0	5,492	0	5,492		0	1	0	1
Recorded investment in loans collectively evaluated for impairment	$ 1,172,446	$ 1,059,769	$ 1,172,446	$ 1,059,769		$ 438,160	$ 369,952	$ 438,160	$ 369,952		$ 721,317	$ 680,680	$ 721,317	$ 680,680		$ 8,607	$ 2,415	$ 8,607	$ 2,415		$ 4,362	$ 6,722	$ 4,362	$ 6,722