(a) Judges of the probate courts shall be held accountable on their official bonds for the faithful discharge of their duties pursuant to Code Section 29-8-1 as guardians and for the proper distribution of funds coming into their hands as such guardians, provided that no single custodial account exceeds $2,500.00. If any single custodial account exceeds $2,500.00, the judge shall increase the judge's official bond or surety required by Code Section 15-9-7 by $75,000.00.

(b) Subject to subsection (a) of this Code section, the judge shall be authorized to increase the amount of his official bond or surety to correspond to the amounts for which he is custodian under this chapter. The payment of any such increase shall be the responsibility of the county governing authority.