Note 3 - Loans (Details) - Unpaid Principal Balance in Financing Receivables (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses: individually evaluated for impairment	$ 6,029		$ 6,353
Allowance for credit losses: collectively evaluated for impairment	10,950		14,495
Ending balance	969,406	987,146	961,090
Financing receivables: individually evaluated for impairment	29,014		33,769
Financing receivables: collectively evaluated for impairment	940,392		927,321
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses: individually evaluated for impairment	438		581
Allowance for credit losses: collectively evaluated for impairment	1,390		1,357
Ending balance	163,078	166,994	151,057
Financing receivables: individually evaluated for impairment	934		2,699
Financing receivables: collectively evaluated for impairment	162,144		148,358
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses: individually evaluated for impairment	3,406		3,139
Allowance for credit losses: collectively evaluated for impairment	5,611		8,335
Ending balance	474,518	479,396	471,495
Financing receivables: individually evaluated for impairment	18,865		20,102
Financing receivables: collectively evaluated for impairment	455,653		451,393
First Lien Residential Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses: individually evaluated for impairment	1,977		2,437
Allowance for credit losses: collectively evaluated for impairment	2,556		2,877
Ending balance	213,499	216,952	215,926
Financing receivables: individually evaluated for impairment	8,531		10,075
Financing receivables: collectively evaluated for impairment	204,968		205,851
Junior Lein Residential Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses: individually evaluated for impairment	178		141
Allowance for credit losses: collectively evaluated for impairment	365		405
Ending balance	52,484	54,488	56,335
Financing receivables: individually evaluated for impairment	528		649
Financing receivables: collectively evaluated for impairment	51,956		55,686
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses: individually evaluated for impairment	30		55
Allowance for credit losses: collectively evaluated for impairment	479		615
Ending balance	65,827	69,164	66,277
Financing receivables: individually evaluated for impairment	156		244
Financing receivables: collectively evaluated for impairment	65,671		66,033
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses: individually evaluated for impairment	0		0
Allowance for credit losses: collectively evaluated for impairment	549		906
Ending balance	0		0
Financing receivables: individually evaluated for impairment	0		0
Financing receivables: collectively evaluated for impairment	$ 0		$ 0