Note 4 - Loans and Allowance for Loan Losses (Details) - Activity in the allowance for loan losses, by portfolio segment (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	$ 27,735	$ 28,325	$ 27,882	$ 30,108
Provision for loan losses	1,034	775	1,953	1,546
Charge-offs	(2,073)	(1,324)	(3,691)	(5,215)
Recoveries	702	621	1,254	1,958
Net charge-offs	(1,371)	(703)	(2,437)	(3,257)
Balance	27,398	28,397	27,398	28,397
Period-end amount allocated to:
Loans individually evaluated for impairment	1,895	3,399	1,895	3,399	2,843
Loans collectively evaluated for impairment	25,503	24,998	25,503	24,998	25,039
Commercial and Residential Real Estate Collateral [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	3,532	1,914	3,446	2,063
Provision for loan losses	233	208	362	147
Charge-offs	(133)	(165)	(229)	(294)
Recoveries	87	26	140	67
Net charge-offs	(46)	(139)	(89)	(227)
Balance	3,719	1,983	3,719	1,983
Period-end amount allocated to:
Loans individually evaluated for impairment	114	187	114	187	203
Loans collectively evaluated for impairment	3,605	1,796	3,605	1,796	3,243
Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	16,131	9,641	15,453	10,117
Provision for loan losses	(64)	657	785	1,790
Charge-offs	(887)	(78)	(1,126)	(2,617)
Recoveries	295	248	363	1,178
Net charge-offs	(592)	170	(763)	(1,439)
Balance	15,475	10,468	15,475	10,468
Period-end amount allocated to:
Loans individually evaluated for impairment	1,509	2,888	1,509	2,888	2,309
Loans collectively evaluated for impairment	13,966	7,580	13,966	7,580	13,144
Credit Cards [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	6,799	5,500	7,211	5,513
Provision for loan losses	616	603	877	1,377
Charge-offs	(743)	(829)	(1,652)	(1,826)
Recoveries	204	212	440	422
Net charge-offs	(539)	(617)	(1,212)	(1,404)
Balance	6,876	5,486	6,876	5,486
Period-end amount allocated to:
Loans individually evaluated for impairment	76	80	76	80	82
Loans collectively evaluated for impairment	6,800	5,406	6,800	5,406	7,129
Other Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	1,273	1,771	1,772	1,847
Provision for loan losses	249	122	(71)	116
Charge-offs	(310)	(252)	(684)	(478)
Recoveries	116	135	311	291
Net charge-offs	(194)	(117)	(373)	(187)
Balance	1,328	1,776	1,328	1,776
Period-end amount allocated to:
Loans individually evaluated for impairment	196	244	196	244	249
Loans collectively evaluated for impairment	1,132	1,532	1,132	1,532	1,523
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance		9,499		10,568
Provision for loan losses		(815)		(1,884)
Balance		8,684		8,684
Period-end amount allocated to:
Loans collectively evaluated for impairment		$ 8,684		$ 8,684