A. 1. The days and hours within which a state bank or national bank, credit union, savings association or trust company may be open for business may be set by its board of directors.

2. Any plan so adopted by any such organization may be changed by it from time to time in its discretion.

B. 1. Any act authorized, required or permitted to be performed at or by any such bank, association or credit union on a business day when such bank, association or credit union is so closed may be performed on the next succeeding business day, and no liability or loss of rights of any kind shall result from such delay. If the organization chooses to close on a weekday which is not a legal holiday, the bank shall still have responsibility for paying or returning checks by its midnight deadline. For purposes of this section, Saturday and Sunday shall not be considered "business days".