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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	12 Months Ended
	Dec. 31, 2018 USD ($) Loan	Dec. 31, 2017 USD ($) Loan	Dec. 31, 2016 USD ($) Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	41	40	64
Recorded Investment | $	$ 1,675	$ 8,071	$ 6,616
Extensions of maturity
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	2	5	3
Recorded Investment | $	$ 60	$ 6,497	$ 1,995
Interest-rate reductions
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	39	35	61
Recorded Investment | $	$ 1,615	$ 1,574	$ 4,621

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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.

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-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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