Loans - Information Regarding Troubled Debt Restructurings (Details) (Non-Covered Loans, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	$ 43,037	$ 80,342
Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	12,099	13,410
Non-Accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	30,938	66,932
Multi-Family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	22,604	60,631
Multi-Family | Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	9,962	10,083
Multi-Family | Non-Accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	12,642	50,548
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	18,295	17,824
Commercial Real Estate | Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	2,137	2,198
Commercial Real Estate | Non-Accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	16,158	15,626
One-to-four family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	0	0
One-to-four family | Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	0	0
One-to-four family | Non-Accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	0	0
Acquisition, Development and Construction
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	935
Acquisition, Development and Construction | Non-Accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	935
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	1,203	1,887
Commercial and Industrial | Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings		1,129
Commercial and Industrial | Non-Accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	$ 1,203	$ 758