Note 4 - Loans and Allowance for Loan Losses (Detail) - Allowance for Loan Losses (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Balance, beginning of period	$ 28,397	$ 27,796	$ 30,108	$ 26,416
Provision for loan losses	1,299	2,842	2,846	8,845
Charge-offs	(2,023)	(2,190)	(7,238)	(8,266)
Recoveries	472	703	2,429	2,156
Net charge-offs	(1,551)	(1,487)	(4,809)	(6,110)
Balance at end of period	28,145	29,151	28,145	29,151
Loans individually evaluated for impairment	3,291	3,069	3,291	3,069	3,483
Loans collectively evaluated for impairment	24,854	26,082	24,854	26,082	26,625
Commercial Loans [Member]
Balance, beginning of period	1,983	2,524	2,063	2,277
Provision for loan losses	83	116	230	903
Charge-offs	(86)	(345)	(380)	(1,185)
Recoveries	62	72	129	372
Net charge-offs	(24)	(273)	(251)	(813)
Balance at end of period	2,042	2,367	2,042	2,367
Loans individually evaluated for impairment	272	312	272	312	367
Loans collectively evaluated for impairment	1,770	2,055	1,770	2,055	1,696
Real Estate Loans [Member]
Balance, beginning of period	10,468	9,929	10,117	9,692
Provision for loan losses	327	(64)	2,118	1,804
Charge-offs	(773)	(255)	(3,390)	(2,280)
Recoveries	61	151	1,238	545
Net charge-offs	(712)	(104)	(2,152)	(1,735)
Balance at end of period	10,083	9,761	10,083	9,761
Loans individually evaluated for impairment	2,676	2,371	2,676	2,371	2,759
Loans collectively evaluated for impairment	7,407	7,390	7,407	7,390	7,358
Credit Cards [Member]
Balance, beginning of period	5,486	5,487	5,513	5,549
Provision for loan losses	527	919	1,904	2,684
Charge-offs	(806)	(1,140)	(2,632)	(3,441)
Recoveries	242	261	664	735
Net charge-offs	(564)	(879)	(1,968)	(2,706)
Balance at end of period	5,449	5,527	5,449	5,527
Loans individually evaluated for impairment	89	107	89	107	91
Loans collectively evaluated for impairment	5,360	5,420	5,360	5,420	5,422
Other Consumer and Other Loans [Member]
Balance, beginning of period	1,776	1,777	1,847	1,958
Provision for loan losses	236	320	352	764
Charge-offs	(358)	(450)	(836)	(1,360)
Recoveries	107	219	398	504
Net charge-offs	(251)	(231)	(438)	(856)
Balance at end of period	1,761	1,866	1,761	1,866
Loans individually evaluated for impairment	254	279	254	279	266
Loans collectively evaluated for impairment	1,507	1,587	1,507	1,587	1,581
Unallocated [Member]
Balance, beginning of period	8,684	8,079	10,568	6,940
Provision for loan losses	126	1,551	(1,758)	2,690
Balance at end of period	8,810	9,630	8,810	9,630
Loans collectively evaluated for impairment	$ 8,810	$ 9,630	$ 8,810	$ 9,630	$ 10,568