Skipton Building Society saw its group assets jump 16.4 per cent for the six months to June 30, 1999.
The society now has assets in excess of £4.75bn up from £4.1bn for the same period last year.
The society also saw its mortgage balances leap by 10.2 per cent to £3.53bn compared to £3.2bn for the first six months of 1998.
Skipton's chief executive and director John Goodfellow says: "These are excellent and well balanced set of results in an increasingly competitive market place.
"In particular we have shown our ability to generate substantial income via fees and commissions and to invest wisely in our subsidiaries has enabled us to grow our assets and increase our profits."