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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		9 Months Ended
	Sep. 30, 2018 USD ($) Loan	Sep. 30, 2017 USD ($) Loan	Sep. 30, 2018 USD ($) Loan	Sep. 30, 2017 USD ($) Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	8	4	33	36
Recorded Investment | $	$ 473	$ 182	$ 1,458	$ 7,560
Extensions of maturity
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	1	1	4
Recorded Investment | $	$ 0	$ 60	$ 56	$ 6,263
Interest-rate reductions
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	8	3	32	32
Recorded Investment | $	$ 473	$ 122	$ 1,402	$ 1,297
Forgiveness of debt
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	0	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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

+ References

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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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