Allowance for Loan Losses - Additional Information (Detail)	Mar. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Indemnified portion percentage	80.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration