Note 7 - Loans and Allowance for Loan Losses (Detail) - Activity In The 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
Real Estate Loans [Member]
Balance, beginning of period	$ 24,221	$ 25,432	$ 23,538	$ 24,527
Provision for loan losses	(1,114)	3,742	2,916	10,367
Recoveries	50	105	252	188
Loans charged off	(1,716)	(2,614)	(5,265)	(8,417)
Balance, end of period	21,441	26,665	21,441	26,665
Commercial [Member]
Balance, beginning of period	2,137	3,369	3,508	3,260
Provision for loan losses	591	(775)	(790)	(517)
Recoveries	8	622	129	702
Loans charged off	(36)	(114)	(147)	(343)
Balance, end of period	2,700	3,102	2,700	3,102
Consumer [Member]
Balance, beginning of period	755	937	1,218	997
Provision for loan losses	267	265	(64)	351
Recoveries	80	90	192	217
Loans charged off	(99)	(187)	(343)	(460)
Balance, end of period	1,003	1,105	1,003	1,105
Total [Member]
Balance, beginning of period	27,113	29,738	28,264	28,784
Provision for loan losses	(256)	3,232	2,062	10,201
Recoveries	138	817	573	1,107
Loans charged off	(1,851)	(2,915)	(5,755)	(9,220)
Balance, end of period	$ 25,144	$ 30,872	$ 25,144	$ 30,872