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Note 3 - Loans and Allowance for Loan Losses - Loans Evaluated for Impairment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing receivables, ending balance $ 5,160,236 $ 4,819,134
Financing receivables, individually evaluated for impairment 39,163 51,983
Financing receivables, collectively evaluated for impairment 5,121,073 4,767,151
Ending balance: individually evaluated for impairment 642 3,226
Ending balance: collectively evaluated for impairment 19,709 19,003
Multi-family Residential Portfolio Segment [Member]    
Financing receivables, ending balance 2,273,595 2,178,504
Financing receivables, individually evaluated for impairment 7,311 5,923
Financing receivables, collectively evaluated for impairment 2,266,284 2,172,581
Ending balance: individually evaluated for impairment 205 232
Ending balance: collectively evaluated for impairment 5,618 5,691
Commercial Real Estate Portfolio Segment [Member]    
Financing receivables, ending balance 1,368,112 1,246,132
Financing receivables, individually evaluated for impairment 9,089 6,551
Financing receivables, collectively evaluated for impairment 1,359,023 1,239,581
Ending balance: individually evaluated for impairment 177 179
Ending balance: collectively evaluated for impairment 4,466 4,308
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]    
Financing receivables, ending balance 564,206 558,502
Financing receivables, individually evaluated for impairment 5,445 8,809
Financing receivables, collectively evaluated for impairment 558,761 549,693
Ending balance: individually evaluated for impairment 198 417
Ending balance: collectively evaluated for impairment 2,347 2,486
One-To-Four Family - Residential Portfolio Segment [Member]    
Financing receivables, ending balance 180,663 185,767
Financing receivables, individually evaluated for impairment 9,686 9,989
Financing receivables, collectively evaluated for impairment 170,977 175,778
Ending balance: individually evaluated for impairment 56 60
Ending balance: collectively evaluated for impairment 1,026 955
Co-Operative Apartments Portfolio Segment [Member]    
Financing receivables, ending balance 6,895 7,418
Financing receivables, individually evaluated for impairment 0 0
Financing receivables, collectively evaluated for impairment 6,895 7,418
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment 0 0
Construction Portfolio Segment [Member]    
Financing receivables, ending balance 8,479 11,495
Financing receivables, individually evaluated for impairment 0
Financing receivables, collectively evaluated for impairment 8,479 11,495
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment 68 92
Small Business Administration Portfolio Segment [Member]    
Financing receivables, ending balance 18,479 15,198
Financing receivables, individually evaluated for impairment 137 1,937
Financing receivables, collectively evaluated for impairment 18,342 13,261
Ending balance: individually evaluated for impairment 90
Ending balance: collectively evaluated for impairment 669 391
Taxi Medallion Portfolio Segment [Member]    
Financing receivables, ending balance 6,834 18,996
Financing receivables, individually evaluated for impairment 6,834 16,282
Financing receivables, collectively evaluated for impairment 2,714
Ending balance: individually evaluated for impairment 2,236
Ending balance: collectively evaluated for impairment 7
Commercial Business and Other Portfolio Segment [Member]    
Financing receivables, ending balance 732,973 597,122
Financing receivables, individually evaluated for impairment 661 2,492
Financing receivables, collectively evaluated for impairment 732,312 594,630
Ending balance: individually evaluated for impairment 6 12
Ending balance: collectively evaluated for impairment 5,515 4,480
Unallocated Financing Receivables [Member]    
Financing receivables, ending balance 0 0
Financing receivables, individually evaluated for impairment 0 0
Financing receivables, collectively evaluated for impairment 0 0
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment $ 593