Hi there. May I ask your thoughts about this one. Thanks.

Sarah had a deposit in a savings account with Filipino Universal Bank in the amount of five million pesos (P5,000,000.00). To buy a new car, she obtained a loan from the same bank in the amount of P1,200,000.00, payable in twelve monthly installments. Sarah issued in favor of the bank post-dated checks, each in the amount of P100,000.00, to cover the twelve monthly installment payments. On the third, fourth and fifth months, the corresponding checks bounced.The bank then declared the whole obligation due, and proceeded to deduct the amount of one million pesos (P1,000,000.00) from Sarah's deposit after notice to her that this is a form of compensation allowed by law. Is the bank correct?