Note 13 - Fair Value of Financial Instruments (Details) - Valuation for Level 3 Assets (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Valuation for Level 3 Assets [Abstract]
Balance at beginning of period	$ 8,203,600		$ 5,514,065
Total gains/(losses) (realized/unrealized)
Included in earnings (1)	267,236	[1]	(411,494)	[1]
Included in other comprehensive income	11,653		11,227
Purchases/(Sales)	(41,442)		1,700,865
Paydowns	(50,195)		(59,341)
Sale of real estate owned	(3,351)
Balance at the end of period	$ 8,387,501		$ 6,755,322

[1] Amounts included in interest income from multi-family loans held in securitization trusts, unrealized gain on multi-family loans and debt held in securitization trusts, net and realized gain (loss) on investment securities and related hedges, net.