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Deposits - Additional Information (Detail)	Dec. 31, 2016 USD ($)
Deposits [Abstract]
Brokered deposits	$ 249,000

X

- Definition

Brokered deposits.

+ References

No definition available.

+ Details

Name:	rndb_BrokeredDeposits
Namespace Prefix:	rndb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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