KARACHI (Reuters) - Pakistans foreign exchange reserves fell to $17.90 billion in the week ending Aug. 27, from $17.96 billion in the previous week, the central bank said on Monday. Reserves held by the State Bank of Pakistan (SBP) fell to $14.45 billion from $14.50 billion in the earlier week, while those held by commercial banks eased to $3.45 billion from $3.46 billion, according to the State Bank of Pakistan. Foreign exchange reserves hit a record $18.31 billion in the week ending July 30 but have eased since then due to scheduled debt repayments. The reserves were boosted in June by inflows of $411 million, including a loan of $191.9 million from the World Bank, and another loan of $196.8 million from the Asian Development Bank. Higher export proceeds and a record inflow of remittances have helped Pakistans forex reserves grow steadily.