Writing in the annual accounts of Ashleybank Investments, the directors - named as James Stevenson, David Stevenson, Andrew Stevenson and Douglas Needham - told how the average rate of interest received on funds deposited at banks had been 1.5%.
They went on to say: "This is a pathetic reward for leaving funds at the mercy of bankers whose priority has been on personalising profits while socialising their losses.
"In other words, they stuffed their pockets in the good times and stuffed the country in the bad ones."
The group, which describes itself as being involved in providing management services, leasing property, property development, investment and participating in trading businesses, is controlled by the Stevenson family.
Edinburgh Woollen Mill was started in 1946 by the Stevenson family as the Langholm Dyeing and Finishing Company in 1946.
It was built up into a major high street presence by brothers Neil and David Stevenson and eventually sold for £49 million in 2001 before changing hands again for £67.5m in 2002.
The Ashleybank Investment accounts show turnover increased from £1.24m to £1.33m, while pre-tax profits came in almost 28% ahead at £871,404 in 2012, against £682,292 in the previous 12 months.
The directors said: "The group invests in a wide range of asset classes which also involves a diversification of business risk varying at end from cash on deposit with banking institutions to the other in high risk start-up businesses and private equity. As assets are primarily held at cost, profits will vary from year to year, depending on realisations."
Income from fixed asset investments grew from £220,928 to £314,088, while interest and similar income went up from £147,955 to £248,896.
The directors said: "The group has its own directly owned portfolio of property which is mainly in the retail sector and invests in a variety of collective funds which vary widely in their risk/reward profile. The direct property portfolio performed reasonably with steady rental improvement. There were no property acquisitions or disposals.
"The group investments performed in line with key market indicators and generated an income return of approximately 2%."
An impairment provision of £177,372 was booked in the accounts, against £457,500 in the prior year.
Net funds increased over the course of the year from £12.3m to £12.67m.