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Loans Receivable and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) SecurityLoan	Dec. 31, 2016 USD ($) SecurityLoan
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	8	1
Pre-Modification Outstanding Recorded Investment	$ 3,604	$ 1,300
Post-Modification Outstanding Recorded Investment	$ 3,391	$ 1,300
Mortgage Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	5
Pre-Modification Outstanding Recorded Investment	$ 2,468
Post-Modification Outstanding Recorded Investment	$ 2,260
Mortgage Portfolio Segment [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	5
Pre-Modification Outstanding Recorded Investment	$ 2,468
Post-Modification Outstanding Recorded Investment	$ 2,260
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	1	1
Pre-Modification Outstanding Recorded Investment	$ 874	$ 1,300
Post-Modification Outstanding Recorded Investment	$ 874	$ 1,300
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	2
Pre-Modification Outstanding Recorded Investment	$ 262
Post-Modification Outstanding Recorded Investment	$ 257

X

- Definition

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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- Definition

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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- Definition

Pre-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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+ References

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