Summary of Interest Recognized and Cash-Basis Interest Earned on Impaired Loans (Detail) - USD ($)	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Financing Receivable, Impaired [Line Items]
Interest income recognized during impairment	$ 45	$ 34
Cash-basis interest income recognized	$ 45	$ 34

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

Name:	us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration