Note 3 - Loans (Detail) - 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								3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Mar. 31, 2012 Commercial And Industrial [Member] Period Beginning [Member]	Jun. 30, 2011 Commercial And Industrial [Member] Period Beginning [Member]	Jun. 30, 2012 Commercial And Industrial [Member] Period Beginning [Member]	Jun. 30, 2011 Commercial And Industrial [Member] Period Beginning [Member]	Jun. 30, 2012 Commercial And Industrial [Member] Period Ending [Member]	Jun. 30, 2011 Commercial And Industrial [Member] Period Ending [Member]	Jun. 30, 2012 Commercial And Industrial [Member]	Jun. 30, 2011 Commercial And Industrial [Member]	Jun. 30, 2012 Commercial And Industrial [Member]	Jun. 30, 2011 Commercial And Industrial [Member]	Dec. 31, 2011 Commercial And Industrial [Member]	Mar. 31, 2012 Real Estate Mortgage [Member] Period Beginning [Member]	Jun. 30, 2011 Real Estate Mortgage [Member] Period Beginning [Member]	Jun. 30, 2012 Real Estate Mortgage [Member] Period Beginning [Member]	Jun. 30, 2011 Real Estate Mortgage [Member] Period Beginning [Member]	Jun. 30, 2012 Real Estate Mortgage [Member] Period Ending [Member]	Jun. 30, 2011 Real Estate Mortgage [Member] Period Ending [Member]	Jun. 30, 2012 Real Estate Mortgage [Member]	Jun. 30, 2011 Real Estate Mortgage [Member]	Jun. 30, 2012 Real Estate Mortgage [Member]	Jun. 30, 2011 Real Estate Mortgage [Member]	Dec. 31, 2011 Real Estate Mortgage [Member]	Mar. 31, 2012 Real Estate Construction [Member] Period Beginning [Member]	Jun. 30, 2011 Real Estate Construction [Member] Period Beginning [Member]	Jun. 30, 2012 Real Estate Construction [Member] Period Beginning [Member]	Jun. 30, 2011 Real Estate Construction [Member] Period Beginning [Member]	Jun. 30, 2012 Real Estate Construction [Member] Period Ending [Member]	Jun. 30, 2011 Real Estate Construction [Member] Period Ending [Member]	Jun. 30, 2012 Real Estate Construction [Member]	Jun. 30, 2011 Real Estate Construction [Member]	Jun. 30, 2012 Real Estate Construction [Member]	Jun. 30, 2011 Real Estate Construction [Member]	Dec. 31, 2011 Real Estate Construction [Member]	Mar. 31, 2012 Consumer And Other [Member] Period Beginning [Member]	Jun. 30, 2011 Consumer And Other [Member] Period Beginning [Member]	Jun. 30, 2012 Consumer And Other [Member] Period Beginning [Member]	Jun. 30, 2011 Consumer And Other [Member] Period Beginning [Member]	Jun. 30, 2012 Consumer And Other [Member] Period Ending [Member]	Jun. 30, 2011 Consumer And Other [Member] Period Ending [Member]	Jun. 30, 2012 Consumer And Other [Member]	Jun. 30, 2011 Consumer And Other [Member]	Jun. 30, 2012 Consumer And Other [Member]	Jun. 30, 2011 Consumer And Other [Member]	Dec. 31, 2011 Consumer And Other [Member]	Mar. 31, 2012 Unallocated [Member] Period Beginning [Member]	Jun. 30, 2011 Unallocated [Member] Period Beginning [Member]	Jun. 30, 2012 Unallocated [Member] Period Beginning [Member]	Jun. 30, 2011 Unallocated [Member] Period Beginning [Member]	Jun. 30, 2012 Unallocated [Member] Period Ending [Member]	Jun. 30, 2011 Unallocated [Member] Period Ending [Member]	Jun. 30, 2012 Unallocated [Member]	Jun. 30, 2011 Unallocated [Member]	Jun. 30, 2012 Unallocated [Member]	Jun. 30, 2011 Unallocated [Member]	Mar. 31, 2012 Total [Member] Period Beginning [Member]	Jun. 30, 2011 Total [Member] Period Beginning [Member]	Jun. 30, 2012 Total [Member] Period Beginning [Member]	Jun. 30, 2011 Total [Member] Period Beginning [Member]	Jun. 30, 2012 Total [Member] Period Ending [Member]	Jun. 30, 2011 Total [Member] Period Ending [Member]	Jun. 30, 2012 Total [Member]	Jun. 30, 2011 Total [Member]	Jun. 30, 2012 Total [Member]	Jun. 30, 2011 Total [Member]
Allowance for loan losses at beginning and ending of period						$ 9,223	$ 8,218	$ 7,966	$ 8,187	$ 9,146	$ 7,136						$ 16,598	$ 20,668	$ 19,213	$ 22,016	$ 16,152	$ 20,590						$ 235	$ 1,012	$ 320	$ 1,993	$ 185	$ 490						$ 100	$ 247	$ 137	$ 194	$ 104	$ 152						$ 1,910	$ 1,738	$ 685	$ 1,367	$ 1,724	$ 2,025					$ 28,066	$ 31,883	$ 28,321	$ 33,757	$ 27,311	$ 30,393
Ending allowance for loan losses balance for loans individually evaluated for impairment												26	462	26	462								790	794	790	794																																								816	1,256	816	1,256
Ending allowance for loan losses balance for loans collectively evaluated for impairment												9,120	6,674	9,120	6,674								15,362	19,796	15,362	19,796								185	490	185	490								104	152	104	152																		24,771	27,112	24,771	27,112
Loans:
Loans	1,097,588		1,097,588		1,048,006							376,173	334,646	376,173	334,646	345,565							708,699	723,311	708,699	723,311	688,352							7,711	6,717	7,711	6,717	10,335							5,005	3,951	5,005	3,951	3,754																	1,097,588	1,068,625	1,097,588	1,068,625
Recorded investment in loans individually												8,386	15,996	8,386	15,996								20,182	45,154	20,182	45,154								5,517		5,517									1		1																			34,086	61,150	34,086	61,150
Recorded investment in loans collectively												367,787	318,650	367,787	318,650								688,517	678,157	688,517	678,157								2,194	6,717	2,194	6,717								5,004	3,951	5,004	3,951																		1,063,502	1,007,475	1,063,502	1,007,475
Provision for loan losses	200	1,245	600	1,575								(314)	1,282	1,609	1,339								47	286	(2,591)	1,832								633	(522)	529	(2,219)								20	(88)	14	(35)								(186)	287	1,039	658							200	1,245	600	1,575
Charge-offs												(10)	(2,493)	(794)	(2,625)								(945)	(418)	(1,285)	(3,323)								(683)		(683)									(19)	(10)	(61)	(31)																		(1,657)	(2,921)	(2,823)	(5,979)
Recoveries												247	129	365	235								452	54	815	65										19	716								3	3	14	24																		702	186	1,213	1,040
Allowance for loan losses at beginning and ending of period						$ 9,223	$ 8,218	$ 7,966	$ 8,187	$ 9,146	$ 7,136						$ 16,598	$ 20,668	$ 19,213	$ 22,016	$ 16,152	$ 20,590						$ 235	$ 1,012	$ 320	$ 1,993	$ 185	$ 490						$ 100	$ 247	$ 137	$ 194	$ 104	$ 152						$ 1,910	$ 1,738	$ 685	$ 1,367	$ 1,724	$ 2,025					$ 28,066	$ 31,883	$ 28,321	$ 33,757	$ 27,311	$ 30,393