Information Regarding Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	$ 154
Non-Covered Loans
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	29,629	$ 40,499
Non-Covered Loans | Multi-Family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	2,412	3,577
Non-Covered Loans | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	0	0
Non-Covered Loans | One-to-four family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	577	584
Non-Covered Loans | Acquisition, development, and construction
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	0	389
Non-Covered Loans | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	26,486	35,949
Non-Covered Loans | Other
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings		0
Accruing | Other
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	0
Accruing | Non-Covered Loans
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	865	1,254
Accruing | Non-Covered Loans | Multi-Family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	0	0
Accruing | Non-Covered Loans | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	0	0
Accruing | Non-Covered Loans | One-to-four family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	0	0
Accruing | Non-Covered Loans | Acquisition, development, and construction
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	0	389
Accruing | Non-Covered Loans | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	865	865
Accruing | Non-Covered Loans | Other
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings		0
Non-Accrual | Other
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	154
Non-Accrual | Non-Covered Loans
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	28,764	39,245
Non-Accrual | Non-Covered Loans | Multi-Family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	2,412	3,577
Non-Accrual | Non-Covered Loans | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	0	0
Non-Accrual | Non-Covered Loans | One-to-four family
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	577	584
Non-Accrual | Non-Covered Loans | Acquisition, development, and construction
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	0	0
Non-Accrual | Non-Covered Loans | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	$ 25,621	35,084
Non-Accrual | Non-Covered Loans | Other
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings		$ 0