The depository may furnish more than one bond or both bonds and collateral to secure governmental funds deposited with it. If both bonds and collateral are furnished, the depository may withdraw all or any part of the collateral without in any way impairing the bond unless there is a provision in the bond that the collateral will not be withdrawn without the consent of the surety on the bond. All banks engaging in a general commercial banking business in the Virgin Islands are hereby authorized to pledge assets as herein provided as collateral security for deposits of governmental funds.