Westpac is ratcheting up its credit system growth multiples and is keen to brag about it. An update from Westpac's consumer and business bank leaders yesterday played up escalating system growth multiples from a major with a recent history of hovering around one times system.The deposit system multiple reached 1.4 times in the March 2015 quarter, consumer bank CEO George Frazis emphasised in his presentation. This is up from 1.0 times in the December 2015 quarter and as low as 0.7 per cent the quarter before.This aids the leap in the housing lending multiple to 1.3 times in the March 2015 quarter, up from 1.0 per cent in December.This trend overlaps with recent commentary by APRA on bank lending standards that underscores a shift in approach around the sector."Lending at six times or more of gross income is ... nearly ten per cent" of bigger banks' lending books, APRA executive Heidi Richards said at the Macquarie University Financial Risk Day in Sydney last week. APRA said some banks made loans at 6.5 times gross income."Mortgage lending at four times gross income is relatively common, at one-third of all new ADI housing loans," Richards said.If peers chase Westpac the industry will orient itself for a period of accelerated credit growth.