Information Regarding Troubled Debt Restructurings (Detail) (Non-Covered Loans, USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	$ 80,342	$ 260,306
Multi-Family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	60,631	180,648
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	17,824	76,584
One-to-four family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings		1,101
Acquisition, Development and Construction
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings		510
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	1,887	1,463
Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	13,410	105,012
Accruing | Multi-Family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	10,083	66,092
Accruing | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	2,198	37,457
Accruing | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	1,129	1,463
Non-Accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	66,932	155,294
Non-Accrual | Multi-Family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	50,548	114,556
Non-Accrual | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	15,626	39,127
Non-Accrual | One-to-four family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings		1,101
Non-Accrual | Acquisition, Development and Construction
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings		510
Non-Accrual | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	$ 758