Loans Receivable and Allowance for Loan Losses - Analysis of Loans Modified in Troubled Debt Restructuring by Type of Concession (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) Loan	Mar. 31, 2015 USD ($) Loan
Financing Receivable, Modifications [Line Items]
Number of loans modified in troubled debt restructurings | Loan	26	3
Recorded investment | $	$ 2,859	$ 405
Extended under forbearance
Financing Receivable, Modifications [Line Items]
Number of loans modified in troubled debt restructurings | Loan	3	0
Recorded investment | $	$ 1,995	$ 0
Interest-rate reductions
Financing Receivable, Modifications [Line Items]
Number of loans modified in troubled debt restructurings | Loan	23	3
Recorded investment | $	$ 864	$ 405