Note 3 - Loans (Details) - Age Analysis of Recorded Investment in Loans (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	$ 24,588	$ 37,367
60 - 89 Days Past Due	8,615	13,002
Greater than 90 Days	33,196	47,238
Total Past Due	66,399	97,607
Current	3,732,255	3,325,401
Total Loans	3,798,654	3,423,008
Multi-Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	7,721	14,101
60 - 89 Days Past Due	1,729	3,684
Greater than 90 Days	7,554	13,349
Total Past Due	17,004	31,134
Current	1,906,456	1,680,905
Total Loans	1,923,460	1,712,039
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	1,612	5,029
60 - 89 Days Past Due	1,903	7,699
Greater than 90 Days	6,510	9,962
Total Past Due	10,025	22,690
Current	611,544	489,862
Total Loans	621,569	512,552
One-To-Four Family - Mixed-Use Property [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	10,408	14,017
60 - 89 Days Past Due	1,154	1,099
Greater than 90 Days	7,341	9,063
Total Past Due	18,903	24,179
Current	554,876	571,572
Total Loans	573,779	595,751
One-To-Four Family - Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	1,751	3,828
60 - 89 Days Past Due	2,244	518
Greater than 90 Days	11,051	12,968
Total Past Due	15,046	17,314
Current	172,526	176,412
Total Loans	187,572	193,726
Co-Operative Apartments [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due		99
Greater than 90 Days		144
Total Past Due		243
Current	9,835	9,894
Total Loans	9,835	10,137
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	3,000
Total Past Due	3,000
Current	2,286	4,247
Total Loans	5,286	4,247
Small Business Administration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	90	106
Total Past Due	90	106
Current	7,044	7,686
Total Loans	7,134	7,792
Taxi Medallion [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	22,519	13,123
Total Loans	22,519	13,123
Commercial Business And Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	6	187
60 - 89 Days Past Due	1,585	2
Greater than 90 Days	740	1,752
Total Past Due	2,331	1,941
Current	445,169	371,700
Total Loans	$ 447,500	$ 373,641