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		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Real Estate Loans [Member]
Balance, beginning of period	$ 23,990	$ 24,609	$ 23,538	$ 24,527
Provision for loan losses	1,437	4,438	4,030	6,625
Recoveries	75	15	202	83
Loans charged off	(1,281)	(3,630)	(3,549)	(5,803)
Balance, end of period	24,221	25,432	24,221	25,432
Commercial [Member]
Balance, beginning of period	2,238	3,454	3,508	3,260
Provision for loan losses	(85)	31	(1,381)	258
Recoveries	22	41	121	80
Loans charged off	(38)	(157)	(111)	(229)
Balance, end of period	2,137	3,369	2,137	3,369
Consumer [Member]
Balance, beginning of period	825	959	1,218	997
Provision for loan losses	(11)	59	(331)	86
Recoveries	56	68	112	127
Loans charged off	(115)	(149)	(244)	(273)
Balance, end of period	755	937	755	937
Total [Member]
Balance, beginning of period	27,053	29,022	28,264	28,784
Provision for loan losses	1,341	4,528	2,318	6,969
Recoveries	153	124	435	290
Loans charged off	(1,434)	(3,936)	(3,904)	(6,305)
Balance, end of period	$ 27,113	$ 29,738	$ 27,113	$ 29,738