Note 5 - Loans (Details) - Activity in the Allowance for Loan Losses (USD $) In Thousands, unless otherwise specified	3 Months Ended																					3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 For the three months ended [Member] Multi-Family Residential [Member]	Mar. 31, 2014 For the three months ended [Member] Commercial Real Estate Loans [Member]	Mar. 31, 2014 For the three months ended [Member] One-To-Four Family - Mixed-Use Property [Member]	Mar. 31, 2014 For the three months ended [Member] One-To-Four Family - Residential [Member]	Mar. 31, 2014 For the three months ended [Member] Co-Operative Apartments [Member]	Mar. 31, 2014 For the three months ended [Member] Construction [Member]	Mar. 31, 2014 For the three months ended [Member] Small Business Administration [Member]	Mar. 31, 2014 For the three months ended [Member] Taxi Medallion [Member]	Mar. 31, 2014 For the three months ended [Member] Commercial Business And Other [Member]	Mar. 31, 2014 For the three months ended [Member]	Mar. 31, 2013 Multi-Family Residential [Member]	Mar. 31, 2013 Commercial Real Estate Loans [Member]	Mar. 31, 2013 One-To-Four Family - Mixed-Use Property [Member]	Mar. 31, 2013 One-To-Four Family - Residential [Member]	Mar. 31, 2013 Co-Operative Apartments [Member]	Mar. 31, 2013 Construction [Member]	Mar. 31, 2013 Small Business Administration [Member]	Mar. 31, 2013 Taxi Medallion [Member]	Dec. 31, 2012 Taxi Medallion [Member]	Mar. 31, 2013 Commercial Business And Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	$ 31,776	$ 31,104	$ 12,084	$ 4,959	$ 6,328	$ 2,079	$ 104	$ 444	$ 458		$ 5,320	$ 31,776	$ 13,001	$ 5,705	$ 5,960	$ 1,999	$ 46	$ 66	$ 505	$ 7	$ 7	$ 3,815
Balance	30,270	31,027	11,103	5,379	7,142	1,944		40	391	14	4,257	30,270	12,395	5,660	6,340	2,077	88	67	471	7	7	3,922
Allowance for credit losses, ending balance: individually evaluated for impairment		1,398	304	210	617	57		9			218	1,415	209	320	592	60		37				180
Allowance for credit losses, ending balance: collectively evaluated for impairment		29,629	10,799	5,169	6,525	1,887		31	391	14	4,039	28,855	12,186	5,340	5,748	2,017	88	30	471	7		3,742
Charge-off's	(901)	(6,282)	(605)	(47)	(83)	(42)					(124)	(901)	(1,488)	(681)	(2,606)	(691)	(74)	(234)	(204)			(304)
Recoveries	514	205	7	382	40	68	7		10			514	11	80	53	31			30
Provision		6,000	(383)	85	857	(161)	(111)	(404)	(77)	14	(939)	(1,119)	871	556	2,933	738	116	235	140			411
Ending balance, Financing Receivables		3,188,702	1,722,764	509,728	587,482	194,611	9,974	4,859	7,628	24,127	427,406	3,488,579	1,528,353	507,932	615,661	197,268	8,221	10,952	8,812	8,777		302,726
Ending balance: individually evaluated for impairment		115,563	20,898	19,558	16,060	13,941		1,316			10,155	81,928	26,094	25,545	18,762	15,548	267	10,229	505			18,613
Ending balance: collectively evaluated for impairment		$ 3,073,139	$ 1,701,866	$ 490,170	$ 571,422	$ 180,670	$ 9,974	$ 3,543	$ 7,628	$ 24,127	$ 417,251	$ 3,406,651	$ 1,502,259	$ 482,387	$ 596,899	$ 181,720	$ 7,954	$ 723	$ 8,307	$ 8,777		$ 284,113