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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		6 Months Ended
	Jun. 30, 2017 USD ($) Loan	Jun. 30, 2016 USD ($) Loan	Jun. 30, 2017 USD ($) Loan	Jun. 30, 2016 USD ($) Loan
Financing Receivable, Modifications [Line Items]
Number of Loans	11	16	32	42
Recorded Investment | $	$ 6,175	$ 535	$ 7,378	$ 3,394
Forgiveness
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0
Extensions of maturity
Financing Receivable, Modifications [Line Items]
Number of Loans	2	0	3	3
Recorded Investment | $	$ 5,855	$ 0	$ 6,203	$ 1,995
Interest-rate reductions
Financing Receivable, Modifications [Line Items]
Number of Loans	9	16	29	39
Recorded Investment | $	$ 320	$ 535	$ 1,175	$ 1,399

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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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