Western Australian authorised deposit-taking institution Goldfields Money has more than doubled the size of its loan portfolio since demutualising and listing on the Australian Securities Exchange in 2012.The loan book has grown from $49 million to $117 million over the past two years. It grew 41 per cent in the year to June.The increase in the scale of the business has been at the cost of earnings growth. Goldfields Money reported a net profit of A$201,204 for the year to June - an increase of just two per cent from the previous corresponding period. Revenue was up 18 per cent to $6.6 million. Deposits increased by 27 per cent to more than $120 million.The net interest margin was 2.04 per cent, compared with 2.3 per cent in 2012/13.Goldfields Money managing director David Holden said in a statement that the ADI is keen to continue growing but would focus more on profitable growth.The ADI is doing more business and personal lending to boost its margin.Earlier this month the ADI secured a $25 million portfolio funding facility from a bank. Loans originated under the facility will be "off balance sheet" for accounting and regulatory purposes.Holden said this would give the ADI greater flexibility in the management of its capital and liquidity.