Note 3 - Loans (Detail) - Credit Quality Indicators (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Commercial & Industrial
Financing Receivable	$ 988,030	$ 983,909
Pass [Member] | Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	135,250	122,812
Pass [Member] | Commercial Real Estate Loans [Member]
Commercial & Industrial
Financing Receivable	374,765	373,320
Watch Loan [Member] | Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	13,824	19,542
Watch Loan [Member] | Commercial Real Estate Loans [Member]
Commercial & Industrial
Financing Receivable	57,624	56,571
Special Mention [Member] | Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	6,226	7,878
Special Mention [Member] | Commercial Real Estate Loans [Member]
Commercial & Industrial
Financing Receivable	19,922	21,155
Substandard [Member] | Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	2,587	2,928
Substandard [Member] | Commercial Real Estate Loans [Member]
Commercial & Industrial
Financing Receivable	7,044	5,686
Impaired Restructured and Accruing Loans [Member] | Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	3,058	3,562
Impaired Restructured and Accruing Loans [Member] | Commercial Real Estate Loans [Member]
Commercial & Industrial
Financing Receivable	10,985	10,652
Impaired Restructured and Accruing Loans [Member] | First Lien Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	4,836	4,425
Impaired Restructured and Accruing Loans [Member] | Junior Lein Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	224	278
Impaired Restructured and Accruing Loans [Member] | Consumer Loans [Member]
Commercial & Industrial
Financing Receivable	176	0
Impaired Nonaccrual Loans [Member] | Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	1,452	1,771
Impaired Nonaccrual Loans [Member] | Commercial Real Estate Loans [Member]
Commercial & Industrial
Financing Receivable	10,490	15,336
Doubtful [Member] | Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	0	0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Commercial & Industrial
Financing Receivable	695	0
Performing Financing Receivable [Member] | First Lien Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	202,711	199,117
Performing Financing Receivable [Member] | Junior Lein Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	61,780	66,169
Performing Financing Receivable [Member] | Consumer Loans [Member]
Commercial & Industrial
Financing Receivable	67,400	64,075
Loans more than 60 days past due [Member] | First Lien Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	1,511	2,203
Loans more than 60 days past due [Member] | Junior Lein Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	116	328
Loans more than 60 days past due [Member] | Consumer Loans [Member]
Commercial & Industrial
Financing Receivable	113	239
Nonaccrual loans [Member] | First Lien Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	4,674	5,374
Nonaccrual loans [Member] | Junior Lein Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	227	278
Nonaccrual loans [Member] | Consumer Loans [Member]
Commercial & Industrial
Financing Receivable	340	210
Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	162,397	158,493
Commercial Real Estate Loans [Member]
Commercial & Industrial
Financing Receivable	481,525	482,720
First Lien Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	213,732	211,119
Junior Lein Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	62,347	67,053
Consumer Loans [Member]
Commercial & Industrial
Financing Receivable	$ 68,029	$ 64,524