Benefit of creditor's securities: surety discharged to extent creditor loses or parts with security without surety's consent. A surety is entitled to the benefit of every security the creditor has against the principal debtor when the suretyship contract is entered into, whether known to the surety or not; if the creditor loses or, without the surety's consent, parts with such security, the surety is discharged to the extent of the value of that security.