Note 3 - Loans (Detail) - Impaired Loans: (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
With no related allowance recorded:
Recorded Investment, With no related allowance recorded	$ 108,883	$ 142,551
Unpaid Principal Balance, With no related allowance recorded	128,600	156,077
Average Recorded Investment, With no related allowance recorded	134,768	142,714
Interest Income Recognized, With no related allowance recorded	1,889	3,922
With an allowance recorded:
Recorded Investment, With an allowance recorded	19,727	47,754
Unpaid Principal Balance, With an allowance recorded	19,808	48,653
Related Allowance, With an allowance recorded	1,494	4,206
Average Recorded Investment, With an allowance recorded	20,926	48,463
Interest Income Recognized, With an allowance recorded	1,004	1,870
Total Impaired Loans:
Recorded Investment, Total Impaired Loans	128,600	190,300
Related Allowance, Total Impaired Loans	1,494	4,206
Average Recorded Investment, Total Impaired Loans	148,900	191,200
Mortgage Loans [Member] | Multi-Family Residential [Member]
With no related allowance recorded:
Recorded Investment, With no related allowance recorded	19,753	33,046
Unpaid Principal Balance, With no related allowance recorded	22,889	36,705
Average Recorded Investment, With no related allowance recorded	27,720	35,792
Interest Income Recognized, With no related allowance recorded	429	910
With an allowance recorded:
Recorded Investment, With an allowance recorded	1,922	13,046
Unpaid Principal Balance, With an allowance recorded	1,937	13,110
Related Allowance, With an allowance recorded	183	346
Average Recorded Investment, With an allowance recorded	3,174	12,270
Interest Income Recognized, With an allowance recorded	124	635
Total Impaired Loans:
Related Allowance, Total Impaired Loans	183	346
Mortgage Loans [Member] | Commercial Real Estate Loans [Member]
With no related allowance recorded:
Recorded Investment, With no related allowance recorded	34,672	38,748
Unpaid Principal Balance, With no related allowance recorded	38,594	42,345
Average Recorded Investment, With no related allowance recorded	43,976	37,511
Interest Income Recognized, With no related allowance recorded	536	1,355
With an allowance recorded:
Recorded Investment, With an allowance recorded	7,773	3,018
Unpaid Principal Balance, With an allowance recorded	7,839	3,018
Related Allowance, With an allowance recorded	359	189
Average Recorded Investment, With an allowance recorded	6,530	3,301
Interest Income Recognized, With an allowance recorded	400	140
Total Impaired Loans:
Related Allowance, Total Impaired Loans	359	189
Mortgage Loans [Member] | One-To-Four Family - Mixed-Use Property [Member]
With no related allowance recorded:
Recorded Investment, With no related allowance recorded	23,054	33,831
Unpaid Principal Balance, With no related allowance recorded	25,825	37,233
Average Recorded Investment, With no related allowance recorded	27,018	32,687
Interest Income Recognized, With no related allowance recorded	485	447
With an allowance recorded:
Recorded Investment, With an allowance recorded	3,314	6,111
Unpaid Principal Balance, With an allowance recorded	3,313	6,213
Related Allowance, With an allowance recorded	571	718
Average Recorded Investment, With an allowance recorded	4,385	2,720
Interest Income Recognized, With an allowance recorded	205	412
Total Impaired Loans:
Related Allowance, Total Impaired Loans	571	718
Mortgage Loans [Member] | One-To-Four Family - Residential [Member]
With no related allowance recorded:
Recorded Investment, With no related allowance recorded	15,328	14,343
Unpaid Principal Balance, With no related allowance recorded	18,995	16,599
Average Recorded Investment, With no related allowance recorded	15,047	11,578
Interest Income Recognized, With no related allowance recorded	186	196
With an allowance recorded:
Recorded Investment, With an allowance recorded	374
Unpaid Principal Balance, With an allowance recorded	374
Related Allowance, With an allowance recorded	94
Average Recorded Investment, With an allowance recorded	188	143
Interest Income Recognized, With an allowance recorded	19
Total Impaired Loans:
Related Allowance, Total Impaired Loans	94
Mortgage Loans [Member] | Co-Operative Apartments [Member]
With no related allowance recorded:
Recorded Investment, With no related allowance recorded	237	153
Unpaid Principal Balance, With no related allowance recorded	299	153
Average Recorded Investment, With no related allowance recorded	174	110
Interest Income Recognized, With no related allowance recorded	2
With an allowance recorded:
Recorded Investment, With an allowance recorded		203
Unpaid Principal Balance, With an allowance recorded		203
Related Allowance, With an allowance recorded		58
Average Recorded Investment, With an allowance recorded	101	51
Interest Income Recognized, With an allowance recorded		11
Total Impaired Loans:
Related Allowance, Total Impaired Loans		58
Mortgage Loans [Member] | Construction [Member]
With no related allowance recorded:
Recorded Investment, With no related allowance recorded	10,598	10,995
Unpaid Principal Balance, With no related allowance recorded	15,182	11,380
Average Recorded Investment, With no related allowance recorded	14,689	11,166
Interest Income Recognized, With no related allowance recorded	173	672
With an allowance recorded:
Recorded Investment, With an allowance recorded	3,805	17,561
Unpaid Principal Balance, With an allowance recorded	3,805	17,561
Related Allowance, With an allowance recorded	38	268
Average Recorded Investment, With an allowance recorded	4,275	21,296
Interest Income Recognized, With an allowance recorded	140	453
Total Impaired Loans:
Related Allowance, Total Impaired Loans	38	268
Mortgage Loans [Member]
With an allowance recorded:
Related Allowance, With an allowance recorded	1,245	1,579
Total Impaired Loans:
Recorded Investment, Total Impaired Loans	120,830	171,055
Unpaid Principal Balance, Total Impaired Loans	139,052	184,520
Related Allowance, Total Impaired Loans	1,245	1,579
Average Recorded Investment, Total Impaired Loans	147,277	168,625
Interest Income Recognized, Total Impaired Loans	2,699	5,231
Non-Mortgage Loans [Member] | Small Business Administration [Member]
With no related allowance recorded:
Recorded Investment, With no related allowance recorded	850	275
Unpaid Principal Balance, With no related allowance recorded	1,075	500
Average Recorded Investment, With no related allowance recorded	1,042	69
Interest Income Recognized, With no related allowance recorded	25	3
With an allowance recorded:
Recorded Investment, With an allowance recorded		195
Unpaid Principal Balance, With an allowance recorded		195
Related Allowance, With an allowance recorded		88
Average Recorded Investment, With an allowance recorded		777
Interest Income Recognized, With an allowance recorded		10
Total Impaired Loans:
Related Allowance, Total Impaired Loans		88
Non-Mortgage Loans [Member] | Commercial Business And Other [Member]
With no related allowance recorded:
Recorded Investment, With no related allowance recorded	4,391	11,160
Unpaid Principal Balance, With no related allowance recorded	5,741	11,162
Average Recorded Investment, With no related allowance recorded	5,102	13,801
Interest Income Recognized, With no related allowance recorded	53	339
With an allowance recorded:
Recorded Investment, With an allowance recorded	2,539	7,620
Unpaid Principal Balance, With an allowance recorded	2,540	8,353
Related Allowance, With an allowance recorded	249	2,539
Average Recorded Investment, With an allowance recorded	2,273	7,905
Interest Income Recognized, With an allowance recorded	116	209
Total Impaired Loans:
Related Allowance, Total Impaired Loans	249	2,539
Non-Mortgage Loans [Member]
With an allowance recorded:
Related Allowance, With an allowance recorded	249	2,627
Total Impaired Loans:
Recorded Investment, Total Impaired Loans	7,780	19,250
Unpaid Principal Balance, Total Impaired Loans	9,356	20,210
Related Allowance, Total Impaired Loans	249	2,627
Average Recorded Investment, Total Impaired Loans	8,417	22,552
Interest Income Recognized, Total Impaired Loans	194	561
Multi-Family Residential [Member]
Total Impaired Loans:
Recorded Investment, Total Impaired Loans	39,114	58,528
Commercial Real Estate Loans [Member]
Total Impaired Loans:
Recorded Investment, Total Impaired Loans	38,974	53,511
One-To-Four Family - Mixed-Use Property [Member]
Total Impaired Loans:
Recorded Investment, Total Impaired Loans	39,610	51,224
One-To-Four Family - Residential [Member]
Total Impaired Loans:
Recorded Investment, Total Impaired Loans	20,551	17,470
Co-Operative Apartments [Member]
Total Impaired Loans:
Recorded Investment, Total Impaired Loans	340	356
Construction [Member]
Total Impaired Loans:
Recorded Investment, Total Impaired Loans	14,403	31,125
Small Business Administration [Member]
Total Impaired Loans:
Recorded Investment, Total Impaired Loans	779	1,136
Commercial Business And Other [Member]
Total Impaired Loans:
Recorded Investment, Total Impaired Loans	$ 22,543	$ 32,367