Note 6 - Investment Securities (Detail) (USD $)	6 Months Ended		7 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Dec. 31, 2011
Proceeds from Sale of Mortgage Backed Securities (MBS) categorized as Available-for-sale	$ 179,493,000	$ 470,411,000	$ 179,500,000
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS)		108,200,000	178,100,000
Proceeds From Sales and Repayments of Other Investment Securities	41,100,000	367,500,000
Proceeds from Maturities, Repayments and Calls of Trading Securities Held-for-investment	470,800,000	275,000,000
Trading Securities, Realized Gain	5,200,000	11,400,000
Trading Securities, Realized Loss	608,000	0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Percentage of Nonperforming Assets	22.20%
Percentage of Unrealized Losses for Securities with Unrealized Losses for Less Than Twelve Months	2.20%
Percentage of Unrealized Losses for Securities with Unrealized Losses for Greater than Twelve Months	9.20%
Pledged Investment Securities	$ 1,540,000,000		$ 1,540,000,000	$ 1,680,000,000