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Additional Information about Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 36,134 $ 51,954
Impaired loans with no related allowance, Unpaid Principal Balance 44,801 61,617
Impaired loans with no related allowance, Average Recorded Investment 44,044 67,805
Impaired loans with no related allowance, Interest Income Recognized 335 2,044
Multi-Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 13,002 27,464
Impaired loans with no related allowance, Unpaid Principal Balance 15,054 29,379
Impaired loans with no related allowance, Average Recorded Investment 20,233 30,965
Impaired loans with no related allowance, Interest Income Recognized 208 1,320
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 11,203 13,995
Impaired loans with no related allowance, Unpaid Principal Balance 16,899 15,480
Impaired loans with no related allowance, Average Recorded Investment 12,599 25,066
Impaired loans with no related allowance, Interest Income Recognized 54 383
One-to-four family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 2,859 3,384
Impaired loans with no related allowance, Unpaid Principal Balance 3,373 8,929
Impaired loans with no related allowance, Average Recorded Investment 3,122 2,302
Impaired loans with no related allowance, Interest Income Recognized 23 75
Acquisition, Development and Construction    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment   2,637
Impaired loans with no related allowance, Unpaid Principal Balance   3,035
Impaired loans with no related allowance, Average Recorded Investment 1,318 1,086
Impaired loans with no related allowance, Interest Income Recognized   148
Other loans    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 9,070 4,474
Impaired loans with no related allowance, Unpaid Principal Balance 9,475 4,794
Impaired loans with no related allowance, Average Recorded Investment 6,772 8,386
Impaired loans with no related allowance, Interest Income Recognized $ 50 $ 118