The amortized cost of a financial instrument at the end of each reporting period is computed as the net of the amount at which the financial instrument is measured at initial recognition minus any repayment of the principal, plus or minus the cumulative amortization using the effective interest method of any different between the amount at initial recognition and the maturity amount, minus, in the case of a financial asset, any reduction (directly or through the use of an allowance account) for impairment or uncollectibility