Note 3 - Loans (Detail) - Allowance for Credit Losses and Recorded Investment in Financing Receivables (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Beginning balance	$ 21,220	$ 21,347	$ 21,019	$ 21,431
Provision for loan losses	2,494	4,256	4,988	7,267
Loans charged off	(2,422)	(4,422)	(4,917)	(7,710)
Recoveries	230	146	432	339
Ending balance	21,522	21,327	21,522	21,327
Ending balance: individually evaluated for impairment	3,132	3,977	3,132	3,977
Ending balance: collectively evaluated for impairment	18,390	17,370	18,390	17,370
Ending balance	988,030	1,005,962	988,030	1,005,962	983,909
Ending balance: individually evaluated for impairment	26,680	8,257	26,680	8,257
Ending balance: collectively evaluated for impairment	961,350	997,705	961,350	997,705
Commercial and Industrial [Member]
Beginning balance	2,369	2,762	2,485	3,024
Provision for loan losses	317	89	320	475
Loans charged off	(297)	(129)	(426)	(889)
Recoveries	15	10	25	122
Ending balance	2,404	2,732	2,404	2,732
Ending balance: individually evaluated for impairment	169	659	169	659
Ending balance: collectively evaluated for impairment	2,235	2,073	2,235	2,073
Ending balance	162,397	163,010	162,397	163,010
Ending balance: individually evaluated for impairment	4,510	1,129	4,510	1,129
Ending balance: collectively evaluated for impairment	157,887	161,881	157,887	161,881
Commercial Real Estate Portfolio Segment [Member]
Beginning balance	11,767	12,637	11,534	12,375
Provision for loan losses	720	1,792	2,246	3,605
Loans charged off	(1,308)	(2,872)	(2,649)	(4,427)
Recoveries	36	39	84	43
Ending balance	11,215	11,596	11,215	11,596
Ending balance: individually evaluated for impairment	2,963	3,318	2,963	3,318
Ending balance: collectively evaluated for impairment	8,252	8,278	8,252	8,278
Ending balance	481,525	491,893	481,525	491,893
Ending balance: individually evaluated for impairment	22,170	7,128	22,170	7,128
Ending balance: collectively evaluated for impairment	459,355	484,765	459,355	484,765
First Lien Residential Mortgage Loans [Member]
Beginning balance	5,563	4,022	5,393	3,960
Provision for loan losses	581	1,917	1,288	2,436
Loans charged off	(572)	(1,303)	(1,155)	(1,764)
Recoveries	71	36	117	40
Ending balance	5,643	4,672	5,643	4,672
Ending balance: individually evaluated for impairment	0	0	0	0
Ending balance: collectively evaluated for impairment	5,643	4,672	5,643	4,672
Ending balance	213,732	201,675	213,732	201,675
Ending balance: individually evaluated for impairment	0	0	0	0
Ending balance: collectively evaluated for impairment	213,732	201,675	213,732	201,675
Junior Lein Residential Mortgage Loans [Member]
Beginning balance	532	548	505	774
Provision for loan losses	100	(212)	321	(107)
Loans charged off	(109)	218	(303)	(113)
Recoveries	0	0	0	0
Ending balance	523	554	523	554
Ending balance: individually evaluated for impairment	0	0	0	0
Ending balance: collectively evaluated for impairment	523	554	523	554
Ending balance	62,347	72,807	62,347	72,807
Ending balance: individually evaluated for impairment	0	0	0	0
Ending balance: collectively evaluated for impairment	62,347	72,807	62,347	72,807
Consumer Portfolio Segment [Member]
Beginning balance	945	1,078	931	1,162
Provision for loan losses	(66)	394	98	418
Loans charged off	(136)	(336)	(384)	(518)
Recoveries	108	61	206	134
Ending balance	851	1,197	851	1,197
Ending balance: individually evaluated for impairment	0	0	0	0
Ending balance: collectively evaluated for impairment	851	1,197	851	1,197
Ending balance	68,029	76,577	68,029	76,577
Ending balance: individually evaluated for impairment	0	0	0	0
Ending balance: collectively evaluated for impairment	68,029	76,577	68,029	76,577
Unallocated Financing Receivables [Member]
Beginning balance	44	300	171	136
Provision for loan losses	842	276	715	440
Loans charged off	0	0	0	0
Recoveries	0	0	0	0
Ending balance	886	576	886	576
Ending balance: individually evaluated for impairment	0	0	0	0
Ending balance: collectively evaluated for impairment	886	576	886	576
Ending balance	0	0	0	0
Ending balance: individually evaluated for impairment	0	0	0	0
Ending balance: collectively evaluated for impairment	$ 0	$ 0	$ 0	$ 0