Note 5 - Loans (Detail) - Impaired loans: (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
With no related allowance recorded:
Recorded Investment	$ 94,904	$ 108,883
Unpaid Principal Balance	112,256	128,600
Average Recorded Investment	101,896	134,768
Interest Income Recognized	226	1,889
With an allowance recorded:
Recorded Investment	20,659	19,727
Unpaid Principal Balance	20,725	19,808
Related Allowance	1,398	1,494
Average Recorded Investment	20,195	20,926
Interest Income Recognized	244	1,004
Total Impaired Loans:
Recorded Investment	145,563	171,001
Related Allowance	1,398	1,494
Multi-Family Residential [Member] | Mortgage Loans [Member]
With no related allowance recorded:
Recorded Investment	23,637	19,753
Unpaid Principal Balance	26,895	22,889
Average Recorded Investment	21,695	27,720
Interest Income Recognized	47	429
With an allowance recorded:
Recorded Investment	2,457	1,922
Unpaid Principal Balance	2,458	1,937
Related Allowance	209	183
Average Recorded Investment	2,190	3,174
Interest Income Recognized	36	124
Total Impaired Loans:
Related Allowance	209	183
Multi-Family Residential [Member]
Total Impaired Loans:
Recorded Investment	34,843	35,672
Commercial Real Estate Loans [Member] | Mortgage Loans [Member]
With no related allowance recorded:
Recorded Investment	18,875	34,672
Unpaid Principal Balance	19,644	38,594
Average Recorded Investment	26,774	43,976
Interest Income Recognized	78	536
With an allowance recorded:
Recorded Investment	6,670	7,773
Unpaid Principal Balance	6,736	7,839
Related Allowance	320	359
Average Recorded Investment	7,222	6,530
Interest Income Recognized	69	400
Total Impaired Loans:
Related Allowance	320	359
Commercial Real Estate Loans [Member]
Total Impaired Loans:
Recorded Investment	34,145	38,974
One-To-Four Family - Mixed-Use Property [Member] | Mortgage Loans [Member]
With no related allowance recorded:
Recorded Investment	15,175	23,054
Unpaid Principal Balance	17,537	25,825
Average Recorded Investment	19,115	27,018
Interest Income Recognized	63	485
With an allowance recorded:
Recorded Investment	3,587	3,314
Unpaid Principal Balance	3,586	3,313
Related Allowance	592	571
Average Recorded Investment	3,451	4,385
Interest Income Recognized	55	205
Total Impaired Loans:
Related Allowance	592	571
One-To-Four Family - Mixed-Use Property [Member]
Total Impaired Loans:
Recorded Investment	28,852	37,739
One-To-Four Family - Residential [Member] | Mortgage Loans [Member]
With no related allowance recorded:
Recorded Investment	15,176	15,328
Unpaid Principal Balance	19,226	18,995
Average Recorded Investment	15,252	15,047
Interest Income Recognized	20	186
With an allowance recorded:
Recorded Investment	372	374
Unpaid Principal Balance	372	374
Related Allowance	60	94
Average Recorded Investment	373	188
Interest Income Recognized	4	19
Total Impaired Loans:
Related Allowance	60	94
One-To-Four Family - Residential [Member]
Total Impaired Loans:
Recorded Investment	18,018	20,551
Co-Operative Apartments [Member] | Mortgage Loans [Member]
With no related allowance recorded:
Recorded Investment	267	237
Unpaid Principal Balance	403	299
Average Recorded Investment	252	174
Interest Income Recognized	2	2
With an allowance recorded:
Average Recorded Investment		101
Co-Operative Apartments [Member]
Total Impaired Loans:
Recorded Investment	267	340
Construction [Member] | Mortgage Loans [Member]
With no related allowance recorded:
Recorded Investment	7,835	10,598
Unpaid Principal Balance	12,488	15,182
Average Recorded Investment	9,217	14,689
Interest Income Recognized		173
With an allowance recorded:
Recorded Investment	3,137	3,805
Unpaid Principal Balance	3,137	3,805
Related Allowance	37	38
Average Recorded Investment	3,471	4,275
Interest Income Recognized	28	140
Total Impaired Loans:
Related Allowance	37	38
Construction [Member]
Total Impaired Loans:
Recorded Investment	10,971	14,403
Small Business Administration [Member] | Non-Mortgage Loans [Member]
With no related allowance recorded:
Recorded Investment	505	850
Unpaid Principal Balance	621	1,075
Average Recorded Investment	678	1,042
Interest Income Recognized	1	25
Small Business Administration [Member]
Total Impaired Loans:
Recorded Investment	367	779
Commercial Business And Other [Member] | Non-Mortgage Loans [Member]
With no related allowance recorded:
Recorded Investment	13,434	4,391
Unpaid Principal Balance	15,442	5,741
Average Recorded Investment	8,913	5,102
Interest Income Recognized	15	53
With an allowance recorded:
Recorded Investment	4,436	2,539
Unpaid Principal Balance	4,436	2,540
Related Allowance	180	249
Average Recorded Investment	3,488	2,273
Interest Income Recognized	52	116
Total Impaired Loans:
Related Allowance	180	249
Commercial Business And Other [Member]
Total Impaired Loans:
Recorded Investment	18,100	22,543
Mortgage Loans [Member]
With an allowance recorded:
Related Allowance	1,218	1,245
Total Impaired Loans:
Recorded Investment	97,188	120,830
Unpaid Principal Balance	112,482	139,052
Related Allowance	1,218	1,245
Average Recorded Investment	109,012	147,277
Interest Income Recognized	402	2,699
Non-Mortgage Loans [Member]
With an allowance recorded:
Related Allowance	180	249
Total Impaired Loans:
Recorded Investment	18,375	7,780
Unpaid Principal Balance	20,499	9,356
Related Allowance	180	249
Average Recorded Investment	13,079	8,417
Interest Income Recognized	$ 68	$ 194