Loans Receivable and Allowance for Loan Losses (Schedule of Troubled Debt Restructurings) (Detail) $ in Thousands	3 Months Ended
Mar. 31, 2017 USD ($) SecurityLoan	Mar. 31, 2016 USD ($) SecurityLoan
Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	3	0
Pre-Modification Outstanding Recorded Investment	$ 1,002	$ 0
Post-Modification Outstanding Recorded Investment	$ 988	$ 0
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	3	0
Pre-Modification Outstanding Recorded Investment	$ 1,002	$ 0
Post-Modification Outstanding Recorded Investment	$ 988	$ 0
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	1	0
Pre-Modification Outstanding Recorded Investment	$ 292	$ 0
Post-Modification Outstanding Recorded Investment	$ 284	$ 0
Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	2	0
Pre-Modification Outstanding Recorded Investment	$ 240	$ 0
Post-Modification Outstanding Recorded Investment	$ 234	$ 0
Restructured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	6	0
Pre-Modification Outstanding Recorded Investment	$ 1,534	$ 0
Post-Modification Outstanding Recorded Investment	$ 1,506	$ 0

Number of financing receivables that have been modified by troubled debt restructurings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

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