Note 12 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets
Loan loss allowance, due to differences in computation of bad debts	$ 66,999	$ 89,560
Share-based compensation	12,808	13,573
Accrual for bonuses	4,585	3,380
Non-accrual interest	3,735	3,968
Accrual for litigation	2,918	2,415
Write-down on equity securities and venture capital investments	2,697	2,857
Write-down on other real estate owned	1,357	8,595
State tax	3,253	6,493
Unrealized loss on interest rate swaps	1,739
Unrealized loss on securities available-for-sale, net	2,301	21,569
Other, net	2,179	4,214
Gross deferred tax assets	104,571	156,624
Deferred Tax Liabilities
Basis difference in acquired assets	(3,321)	(3,138)
Dividends on Federal Home Loan Bank common stock	(1,927)	(2,986)
Other, net	(3,075)	(2,773)
Gross deferred tax liabilities	(8,323)	(8,897)
Valuation allowance		(1,263)
Net deferred tax assets	$ 96,248	$ 146,464