Banks and thrifts have seen their home-equity portfolios grow modestly this year, a new Inside Alternative Mortgages analysis reveals. Data culled from bank and thrift call reports filed with federal regulators show that depository institutions held a record $753.73 billion in home-equity products in their portfolios at the end of June. That marked a 5.2 percent increase from the second quarter and a 7.4 percent rise from the end of 2005... [Includes one full-page data chart.]