The source wrote (citation):

Discontinued in April 2017. Data last updated in February 2017 when the survey collection changed.

In response, we have archived the series by marking their metadata as "discontinued." Figures are millions of New Zealand dollars (Mil. NZD) not seasonally adjusted (NSA). The series run from March 1988 to January 2017.

The series reside in the historical catalog (New Zealand » Banking » Credit aggregates - DISCONTINUED) and include, for example:

• MBLDCRUM.INZL = [DISCONTINUED] Credit Aggregates: Domestic Credit - New Zealand Residents, (Mil. NZD, NSA)
• MBLDCUM.INZL  = [DISCONTINUED] Credit Aggregates: Domestic Credit, (Mil. NZD, NSA)
• MBLPCRUM.INZL = [DISCONTINUED] Credit Aggregates: Private Sector Credit - New Zealand Residents, (Mil. NZD, NSA)

Because catalog locations are subject to change, the upper-right search box on DataBuffet.com provides a "find in catalog" mode that accepts a mnemonic.