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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, 2017 USD ($) Loan	Sep. 30, 2016 USD ($) Loan	Sep. 30, 2017 USD ($) Loan	Sep. 30, 2016 USD ($) Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	4	10	36	52
Recorded Investment | $	$ 182	$ 533	$ 7,560	$ 3,927
Extensions of maturity
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	1	0	4	3
Recorded Investment | $	$ 60	$ 0	$ 6,263	$ 1,995
Interest-rate reductions
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	3	10	32	49
Recorded Investment | $	$ 122	$ 533	$ 1,297	$ 1,932

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

+ References

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=84173941&loc=SL6953676-111524

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

+ References

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=84173941&loc=SL6953676-111524

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