Note 5 - Loans (Details) - Activity in the allowance for loan losses: (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Allowance for credit losses:
Balance	$ 31,104	$ 30,344	$ 30,344
Charge-off's	8,888	10,883	21,269
Recoveries	639	438	1,029
Provision	9,500		21,000
Balance	32,355	30,899	31,104
Ending balance: individually evaluated for impairment	1,726		1,494
Ending balance: collectively evaluated for impairment	30,552		29,610
Financing Receivables:
Ending balance, Financing Receivables	3,276,086		3,221,375
Ending balance: individually evaluated for impairment	112,593		128,610
Ending balance: collectively evaluated for impairment	3,163,493		3,092,765
Multi-Family Residential [Member]
Allowance for credit losses:
Balance	13,001	11,267	11,267
Charge-off's	2,749		6,016
Recoveries	65		144
Provision	2,641		7,606
Balance	12,958		13,001
Ending balance: individually evaluated for impairment	272		183
Ending balance: collectively evaluated for impairment	12,080		12,818
Financing Receivables:
Ending balance, Financing Receivables	1,607,090		1,534,438
Ending balance: individually evaluated for impairment	26,012		21,675
Ending balance: collectively evaluated for impairment	1,581,078		1,512,763
Commercial Real Estate Loans [Member]
Allowance for credit losses:
Balance	5,705	5,210	5,210
Charge-off's	734		2,746
Recoveries	293		307
Provision	620		2,934
Balance	5,884		5,705
Ending balance: individually evaluated for impairment	290		359
Ending balance: collectively evaluated for impairment	5,549		5,346
Financing Receivables:
Ending balance, Financing Receivables	526,063		515,438
Ending balance: individually evaluated for impairment	34,895		23,525
Ending balance: collectively evaluated for impairment	491,168		491,913
One-To-Four Family - Mixed-Use Property [Member]
Allowance for credit losses:
Balance	5,960	5,314	5,314
Charge-off's	3,135		4,286
Recoveries	111		358
Provision	3,498		4,574
Balance	6,434		5,960
Ending balance: individually evaluated for impairment	693		571
Ending balance: collectively evaluated for impairment	6,121		5,389
Financing Receivables:
Ending balance, Financing Receivables	605,254		637,353
Ending balance: individually evaluated for impairment	19,146		26,368
Ending balance: collectively evaluated for impairment	586,108		610,985
One-To-Four Family - Residential [Member]
Allowance for credit losses:
Balance	1,999	1,649	1,649
Charge-off's	691		1,583
Recoveries	106		29
Provision	685		1,904
Balance	2,099		1,999
Ending balance: individually evaluated for impairment	60		94
Ending balance: collectively evaluated for impairment	2,117		1,905
Financing Receivables:
Ending balance, Financing Receivables	196,318		198,968
Ending balance: individually evaluated for impairment	14,530		15,702
Ending balance: collectively evaluated for impairment	181,788		183,266
Co-Operative Apartments [Member]
Allowance for credit losses:
Balance	46	80	80
Charge-off's	74		62
Recoveries	4
Provision	123		28
Balance	99		46
Ending balance: collectively evaluated for impairment	141		46
Financing Receivables:
Ending balance, Financing Receivables	9,335		6,303
Ending balance: individually evaluated for impairment	266		237
Ending balance: collectively evaluated for impairment	9,069		6,066
Construction [Member]
Allowance for credit losses:
Balance	66	668	668
Charge-off's	304		4,591
Provision	434		3,989
Balance	196		66
Ending balance: individually evaluated for impairment	34		38
Ending balance: collectively evaluated for impairment	163		28
Financing Receivables:
Ending balance, Financing Receivables	11,450		14,381
Ending balance: individually evaluated for impairment	9,710		14,232
Ending balance: collectively evaluated for impairment	1,740		149
Small Business Administration [Member]
Allowance for credit losses:
Balance	505	987	987
Charge-off's	337		324
Recoveries	60		87
Provision	269		(245)
Balance	497		505
Ending balance: collectively evaluated for impairment	463		505
Financing Receivables:
Ending balance, Financing Receivables	8,565		9,496
Ending balance: individually evaluated for impairment	483		850
Ending balance: collectively evaluated for impairment	8,082		8,646
Taxi Medallion [Member]
Allowance for credit losses:
Balance		41	41
Provision			(34)
Balance	7		7
Ending balance: collectively evaluated for impairment	7		7
Financing Receivables:
Ending balance, Financing Receivables	5,114		9,922
Ending balance: collectively evaluated for impairment	5,114		9,922
Commercial Business And Other [Member]
Allowance for credit losses:
Balance	3,815	5,128	5,128
Charge-off's	864		1,661
Recoveries			104
Provision	1,230		244
Balance	4,181		3,815
Ending balance: individually evaluated for impairment	377		249
Ending balance: collectively evaluated for impairment	3,911		3,566
Financing Receivables:
Ending balance, Financing Receivables	306,897		295,076
Ending balance: individually evaluated for impairment	7,551		26,021
Ending balance: collectively evaluated for impairment	$ 299,346		$ 269,055