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Additional Information about Impaired Loans (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 30,770,000 $ 51,954,000
Impaired loans with no related allowance, Unpaid Principal Balance 39,736,000 61,617,000
Impaired loans with no related allowance, Average Recorded Investment 38,671,000 67,805,000
Impaired loans with no related allowance, Interest Income Recognized 802,000 2,044,000
Impaired loans with an allowance recorded, Recorded Investment 6,442,000 0
Impaired loans with an allowance recorded, Unpaid Principal Balance 6,772,000  
Impaired loans with an allowance recorded, Related Allowance 143,000  
Impaired loans with an allowance recorded, Average Recorded Investment 1,610,000  
Impaired loans with an allowance recorded, Interest Income Recognized 100,000  
Total impaired loans, Recorded Investment 37,212,000  
Total impaired loans, Unpaid Principal Balance 46,508,000  
Total impaired loans, Related Allowance 143,000  
Total impaired loans, Average Recorded Investment 40,281,000  
Total impaired loans, Interest Income Recognized 902,000  
Multi-Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 10,874,000 27,464,000
Impaired loans with no related allowance, Unpaid Principal Balance 13,153,000 29,379,000
Impaired loans with no related allowance, Average Recorded Investment 15,611,000 30,965,000
Impaired loans with no related allowance, Interest Income Recognized 474,000 1,320,000
Total impaired loans, Recorded Investment 10,874,000  
Total impaired loans, Unpaid Principal Balance 13,153,000  
Total impaired loans, Average Recorded Investment 15,611,000  
Total impaired loans, Interest Income Recognized 474,000  
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 10,381,000 13,995,000
Impaired loans with no related allowance, Unpaid Principal Balance 16,114,000 15,480,000
Impaired loans with no related allowance, Average Recorded Investment 11,681,000 25,066,000
Impaired loans with no related allowance, Interest Income Recognized 162,000 383,000
Total impaired loans, Recorded Investment 10,381,000  
Total impaired loans, Unpaid Principal Balance 16,114,000  
Total impaired loans, Average Recorded Investment 11,681,000  
Total impaired loans, Interest Income Recognized 162,000  
One-to-four family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 2,908,000 3,384,000
Impaired loans with no related allowance, Unpaid Principal Balance 3,574,000 8,929,000
Impaired loans with no related allowance, Average Recorded Investment 3,025,000 2,302,000
Impaired loans with no related allowance, Interest Income Recognized 76,000 75,000
Total impaired loans, Recorded Investment 2,908,000  
Total impaired loans, Unpaid Principal Balance 3,574,000  
Total impaired loans, Average Recorded Investment 3,025,000  
Total impaired loans, Interest Income Recognized 76,000  
Acquisition, Development and Construction    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment   2,637,000
Impaired loans with no related allowance, Unpaid Principal Balance   3,035,000
Impaired loans with no related allowance, Average Recorded Investment 659,000 1,086,000
Impaired loans with no related allowance, Interest Income Recognized   148,000
Total impaired loans, Average Recorded Investment 659,000  
Other loans    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 6,607,000 4,474,000
Impaired loans with no related allowance, Unpaid Principal Balance 6,895,000 4,794,000
Impaired loans with no related allowance, Average Recorded Investment 7,695,000 8,386,000
Impaired loans with no related allowance, Interest Income Recognized 90,000 $ 118,000
Impaired loans with an allowance recorded, Recorded Investment 6,442,000  
Impaired loans with an allowance recorded, Unpaid Principal Balance 6,772,000  
Impaired loans with an allowance recorded, Related Allowance 143,000  
Impaired loans with an allowance recorded, Average Recorded Investment 1,610,000  
Impaired loans with an allowance recorded, Interest Income Recognized 100,000  
Total impaired loans, Recorded Investment 13,049,000  
Total impaired loans, Unpaid Principal Balance 13,667,000  
Total impaired loans, Related Allowance 143,000  
Total impaired loans, Average Recorded Investment 9,305,000  
Total impaired loans, Interest Income Recognized $ 190,000