Note 4 - Loans and Allowance for Loan Losses (Detail) - Net (charge-offs)/recoveries, excluding loans acquired (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consumer:
Finance Receivable, net (charge-offs)/recoveries	$ (1,551)	$ (1,487)	$ (4,809)	$ (6,110)
Credit Cards [Member]
Consumer:
Finance Receivable, net (charge-offs)/recoveries	(564)	(879)	(1,968)	(2,706)
Student Loans [Member]
Consumer:
Finance Receivable, net (charge-offs)/recoveries	(20)	(9)	(58)	(31)
Other Consumer [Member]
Consumer:
Finance Receivable, net (charge-offs)/recoveries	(231)	(222)	(380)	(825)
Consumer Loans [Member]
Consumer:
Finance Receivable, net (charge-offs)/recoveries	(815)	(1,110)	(2,406)	(3,562)
Construction Loans [Member]
Consumer:
Finance Receivable, net (charge-offs)/recoveries		(15)	46	(787)
Single Family Residential Loans [Member]
Consumer:
Finance Receivable, net (charge-offs)/recoveries	(246)	(125)	(457)	(480)
Other Commercial Real Estate Loans [Member]
Consumer:
Finance Receivable, net (charge-offs)/recoveries	(466)	36	(1,741)	(468)
Real Estate Loans [Member]
Consumer:
Finance Receivable, net (charge-offs)/recoveries	(712)	(104)	(2,152)	(1,735)
Other Commercial Loans [Member]
Consumer:
Finance Receivable, net (charge-offs)/recoveries	(24)	(276)	(67)	(847)
Agricultural Loans [Member]
Consumer:
Finance Receivable, net (charge-offs)/recoveries		3	(184)	34
Commercial Loans [Member]
Consumer:
Finance Receivable, net (charge-offs)/recoveries	$ (24)	$ (273)	$ (251)	$ (813)