Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	$ 96,976	$ 118,682	$ 102,812	$ 121,962
Charge-offs	(9,295)	(127,120)	(30,749)	(173,487)
Recoveries	1,243	1,592	5,874	4,011
Net charge-offs	(8,052)	(125,528)	(24,875)	(169,476)
Provision for loan and covered loan losses and other	4,290	111,791	15,277	152,459
Ending balance	93,214	104,945	93,214	104,945
Commercial, Industrial, And Agricultural [Member]
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	31,742	43,410	36,761	46,017
Charge-offs	(2,719)	(47,630)	(9,010)	(62,243)
Recoveries	521	1,318	3,183	2,569
Net charge-offs	(2,198)	(46,312)	(5,827)	(59,674)
Provision for loan and covered loan losses and other	2,452	40,546	1,062	51,301
Ending balance	31,996	37,644	31,996	37,644
Office Retail And Industrial [Member]
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	11,857	18,353	11,432	16,012
Charge-offs	(987)	(29,370)	(3,702)	(34,607)
Recoveries	31	2	68	311
Net charge-offs	(956)	(29,368)	(3,634)	(34,296)
Provision for loan and covered loan losses and other	938	22,989	4,041	30,258
Ending balance	11,839	11,974	11,839	11,974
Multi-Family [Member]
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	3,424	4,789	3,575	5,067
Charge-offs	(112)	(2,758)	(490)	(3,242)
Recoveries	0	3	35	165
Net charge-offs	(112)	(2,755)	(455)	(3,077)
Provision for loan and covered loan losses and other	(31)	1,939	161	1,983
Ending balance	3,281	3,973	3,281	3,973
Residential Construction [Member]
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	4,170	12,732	5,242	14,423
Charge-offs	(470)	(9,368)	(1,885)	(13,649)
Recoveries	57	126	62	346
Net charge-offs	(413)	(9,242)	(1,823)	(13,303)
Provision for loan and covered loan losses and other	(100)	4,297	238	6,667
Ending balance	3,657	7,787	3,657	7,787
Other Commercial Real Estate [Member]
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	16,169	23,233	17,512	22,823
Charge-offs	(889)	(34,510)	(3,971)	(48,432)
Recoveries	253	21	1,614	46
Net charge-offs	(636)	(34,489)	(2,357)	(48,386)
Provision for loan and covered loan losses and other	(1,218)	30,896	(840)	45,203
Ending balance	14,315	19,640	14,315	19,640
Consumer [Member]
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	12,367	12,683	12,862	14,131
Charge-offs	(2,482)	(3,042)	(7,369)	(8,164)
Recoveries	374	122	894	574
Net charge-offs	(2,108)	(2,920)	(6,475)	(7,590)
Provision for loan and covered loan losses and other	2,425	2,267	6,297	5,489
Ending balance	12,684	12,030	12,684	12,030
Covered Loans [Member]
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	14,381	982	12,062	989
Charge-offs	(1,636)	(442)	(4,322)	(3,150)
Recoveries	7	0	18	0
Net charge-offs	(1,629)	(442)	(4,304)	(3,150)
Provision for loan and covered loan losses and other	304	8,857	5,298	11,558
Ending balance	13,056	9,397	13,056	9,397
Reserve for Unfunded Commitments [Member]
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	2,866	2,500	3,366	2,500
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net charge-offs	0	0	0	0
Provision for loan and covered loan losses and other	(480)	0	(980)	0
Ending balance	$ 2,386	$ 2,500	$ 2,386	$ 2,500