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Loans Receivable and Allowance for Loan Losses (Schedule of Troubled Debt Restructurings) (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) SecurityLoan	Sep. 30, 2016 USD ($) SecurityLoan	Sep. 30, 2017 USD ($) SecurityLoan	Sep. 30, 2016 USD ($) SecurityLoan
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	2	0	9	0
Pre-Modification Outstanding Recorded Investment	$ 632	$ 0	$ 4,806	$ 0
Post-Modification Outstanding Recorded Investment	$ 470	$ 0	$ 4,480	$ 0
Mortgage Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	2	0	7	0
Pre-Modification Outstanding Recorded Investment	$ 632	$ 0	$ 3,436	$ 0
Post-Modification Outstanding Recorded Investment	$ 470	$ 0	$ 3,202	$ 0
Mortgage Portfolio Segment [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	2	0	7	0
Pre-Modification Outstanding Recorded Investment	$ 632	$ 0	$ 3,436	$ 0
Post-Modification Outstanding Recorded Investment	$ 470	$ 0	$ 3,202	$ 0
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan			1	0
Pre-Modification Outstanding Recorded Investment			$ 1,300	$ 0
Post-Modification Outstanding Recorded Investment			$ 1,210	$ 0
Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan			1	0
Pre-Modification Outstanding Recorded Investment			$ 70	$ 0
Post-Modification Outstanding Recorded Investment			$ 68	$ 0

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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