Troubled Debt Restructures - Schedule of Successes and Failures of Types of Debt Restructuring (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) Contract Loan	Dec. 31, 2016 USD ($) Contract Loan	Dec. 31, 2015 USD ($) Contract Loan
Financing Receivable, Modifications [Line Items]
Number of Loans \| Contract	10	4	10
Recorded Investments	$ 4,600	$ 4,800
Paid In Full [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| Loan	6	6
Recorded Investments	$ 217	$ 844
Paying as Restructured [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| Loan	10	4	10
Recorded Investments	$ 863	$ 482	$ 684
Foreclosure/ Default [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| Loan	1	4
Recorded Investments	$ 15	$ 419
Other Loans [Member] \| Paid In Full [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| Loan	6	6
Recorded Investments	$ 217	$ 844
Other Loans [Member] \| Paying as Restructured [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| Loan	10	4	10
Recorded Investments	$ 863	$ 482	$ 684
Other Loans [Member] \| Foreclosure/ Default [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| Loan	1	4
Recorded Investments	$ 15	$ 419

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- 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

The amount of the outstanding recorded investment related to 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 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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