A$11.654 billion. Impaired assets just don't want to surge, not yet in Australian banking.This number is a decrease of $0.3 billion, or 2.3 per cent, in impaired assets over a year.Past due items stood at $16 billion at September 2018, APRA said in its quarterly ADI exposures data for that quarter. This is an increase of $1.7 billion, or 12 per cent over the year from September 2017.Impaired facilities and past due items as a proportion of gross loans and advances - at 0.84 per cent for all banks - are unchanged from September 2017.One traditional source of strife for banks is commercial property, an unreliable asset class all too prone to freefall.For now, impaired commercial property exposures were $590 million at September 2018, APRA said, a decrease of $60 million (or 9.3 per cent) from September 2017, and representing 0.2 per cent of total commercial property exposures.Specific provisions were $5.7 billion at September 2018, a decrease of $0.3 billion on the year before.As a proportion of gross loans and advances, specific provisions were 0.17 per cent at September 2018, a decrease from 0.19 per cent at September 2017.