Note 6 - Loans (Details) - Allowance for Credit Losses and Recorded Investment in Financing Receivables (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 21,340	$ 21,019	$ 21,431
Provision for loan losses	1,830	7,690	13,337
Loans charged off	(6,044)	(8,432)	(14,922)
Recoveries	871	1,063	1,173
Ending balance	17,997	21,340	21,019
Ending balance: individually evaluated for impairment	6,496	6,323	6,034
Ending balance: collectively evaluated for impairment	11,501	15,017	14,985
Ending balance	986,994	963,557	983,909
Ending balance: individually evaluated for impairment	30,772	36,387	42,215
Ending balance: collectively evaluated for impairment	956,222	927,170	941,694
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,896	2,485	3,024
Provision for loan losses	23	(104)	1,836
Loans charged off	(223)	(560)	(2,546)
Recoveries	116	75	171
Ending balance	1,812	1,896	2,485
Ending balance: individually evaluated for impairment	549	515	253
Ending balance: collectively evaluated for impairment	1,263	1,381	2,232
Ending balance	166,994	150,044	158,493
Ending balance: individually evaluated for impairment	1,388	3,682	5,331
Ending balance: collectively evaluated for impairment	165,606	146,362	153,162
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	11,565	11,534	12,375
Provision for loan losses	105	4,033	6,611
Loans charged off	(2,701)	(4,440)	(7,973)
Recoveries	339	438	521
Ending balance	9,308	11,565	11,534
Ending balance: individually evaluated for impairment	3,678	2,971	3,622
Ending balance: collectively evaluated for impairment	5,630	8,594	7,912
Ending balance	479,396	472,697	482,720
Ending balance: individually evaluated for impairment	19,463	20,558	25,988
Ending balance: collectively evaluated for impairment	459,933	452,139	456,732
First Lien Residential Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	5,656	5,393	3,960
Provision for loan losses	1,705	2,225	4,468
Loans charged off	(2,366)	(2,220)	(3,215)
Recoveries	166	258	180
Ending balance	5,161	5,656	5,393
Ending balance: individually evaluated for impairment	2,082	2,481	1,875
Ending balance: collectively evaluated for impairment	3,079	3,175	3,518
Ending balance	216,952	214,396	211,397
Ending balance: individually evaluated for impairment	9,247	10,993	10,080
Ending balance: collectively evaluated for impairment	207,705	203,403	201,317
Junior Lein Residential Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	555	505	774
Provision for loan losses	317	535	6
Loans charged off	(264)	(485)	(275)
Recoveries	0	0	0
Ending balance	608	555	505
Ending balance: individually evaluated for impairment	168	122	180
Ending balance: collectively evaluated for impairment	440	433	325
Ending balance	54,488	58,747	66,775
Ending balance: individually evaluated for impairment	533	562	606
Ending balance: collectively evaluated for impairment	53,955	58,185	66,169
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	805	931	1,162
Provision for loan losses	(25)	309	381
Loans charged off	(490)	(727)	(913)
Recoveries	250	292	301
Ending balance	540	805	931
Ending balance: individually evaluated for impairment	19	234	104
Ending balance: collectively evaluated for impairment	521	571	827
Ending balance	69,164	67,673	64,524
Ending balance: individually evaluated for impairment	141	592	210
Ending balance: collectively evaluated for impairment	69,023	67,081	64,314
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	863	171	136
Provision for loan losses	(295)	692	35
Loans charged off	0	0	0
Recoveries	0	0	0
Ending balance	568	863	171
Ending balance: individually evaluated for impairment	0	0	0
Ending balance: collectively evaluated for impairment	568	863	171
Ending balance	0	0	0
Ending balance: individually evaluated for impairment	0	0	0
Ending balance: collectively evaluated for impairment	$ 0	$ 0	$ 0