(a) To enable the savings bank to pay charges as they become due, a savings bank may require a borrower to pay monthly in advance, in addition to interest and principal, an amount equal to one-twelfth of the estimated annual taxes, assessments, insurance premiums, and other charges on the real property that secures a loan.
(b) A savings bank may increase or decrease the amount of the loan payment as necessary to meet the charges.
(c) A savings bank may:
(1) carry the payments in trust in an account; or
(2) credit the payments to the indebtedness and advance the money for charges as the charges become due.