Note 3 - Loans and Allowance for Loan Losses (Detail) - Activity In The Allowance For Loan Losses (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance, beginning of year		$ 28,784	$ 23,364
Provision for loan losses	2,772	13,487	17,233
Recoveries	1,045	1,346	577
Loans charged off	(7,636)	(15,353)	(12,390)
Balance, end of year			28,784
Beginning [Member] | Real Estate Loans [Member]
Balance, end of year		23,538	24,527
Beginning [Member] | Commercial Portfolio Segment [Member]
Balance, end of year		3,508	3,260
Beginning [Member] | Consumer Portfolio Segment [Member]
Balance, end of year		1,218	997
Beginning [Member]
Balance, end of year		28,264	28,784
Ending [Member] | Real Estate Loans [Member]
Balance, end of year	22,254	23,538
Ending [Member] | Commercial Portfolio Segment [Member]
Balance, end of year	1,513	3,508
Ending [Member] | Consumer Portfolio Segment [Member]
Balance, end of year	678	1,218
Ending [Member]
Balance, end of year	24,445	28,264
Real Estate Loans [Member]
Balance, beginning of year	23,538
Provision for loan losses	4,930	12,548
Recoveries	666	241
Loans charged off	(6,880)	(13,778)
Balance, end of year	22,254	23,538
Commercial Portfolio Segment [Member]
Balance, beginning of year	3,508
Provision for loan losses	(1,825)	511
Recoveries	145	860
Loans charged off	(315)	(1,123)
Balance, end of year	1,513	3,508
Consumer Portfolio Segment [Member]
Balance, beginning of year	1,218
Provision for loan losses	(333)	428
Recoveries	234	245
Loans charged off	(441)	(452)
Balance, end of year	$ 678	$ 1,218