Information Regarding Troubled Debt Restructurings (Detail) - Non-Covered Loans - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	$ 18,507	$ 12,155
Multi-Family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	11,099	2,652
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	2,529	6,370
One-to-four family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	1,605	987
Acquisition, Development and Construction
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings		27
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	3,068	1,906
Other loans
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	206	213
Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	3,268	2,759
Accruing | Multi-Family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	1,999	2,017
Accruing | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings		115
Accruing | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	1,269	627
Non-Accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	15,239	9,396
Non-Accrual | Multi-Family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	9,100	635
Non-Accrual | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	2,529	6,255
Non-Accrual | One-to-four family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	1,605	987
Non-Accrual | Acquisition, Development and Construction
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings		27
Non-Accrual | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	1,799	1,279
Non-Accrual | Other loans
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	$ 206	$ 213