B ank ▁Rak y at " ▁in ▁ 1 9 7 2 . ▁In ▁ 1 9 7 1 , ▁" L emb aga ▁P ert ub u han ▁Pel ad ang " ▁( Plan ters ' ▁Organ ization ▁Board ) ▁was ▁established ▁and ▁all ▁agricult ural - based ▁co oper ative ▁companies ▁under ▁Bank ▁Pers atu an ▁were ▁am alg am ated ▁under ▁" L emb aga ▁P ert ub u han ▁Pel ad ang " ▁administration . ▁In ▁that ▁same ▁year ▁Bank ▁Pers atu an ▁opened ▁its ▁membership ▁to ▁individual ▁members . ▁ ▁In ▁ 1 9 7 1 , ▁the ▁co oper ative ▁opened ▁its ▁membership ▁to ▁both ▁individuals ▁and ▁co oper atives . ▁By ▁ 1 9 8 1 ▁its ▁changed ▁its ▁name ▁to ▁Bank ▁Pers atu an ▁Ker jas ama ▁Se ber ang ▁P era i ▁Ber had ▁and ▁only ▁in ▁ 1 9 9 5 , ▁Bank ▁Pers atu an ▁adopted ▁its ▁current ▁name ▁when ▁it ▁is ▁changed ▁to ▁" K oper asi ▁Bank ▁Pers atu an ▁Malays ia ▁Ber had " ▁or ▁can ▁simply ▁be ▁called ▁Bank ▁Pers atu an . ▁On ▁September ▁ 2 0 1 8 ▁its ▁name ▁officially ▁change ▁to ▁Co - op bank ▁P ert ama ▁as ▁part ▁of ▁its ▁transformation ▁& ▁re - brand ing ▁process . ▁ ▁Pre vious ▁Chair man ▁ ▁D ato ' ▁Y us of ▁Hil mi ▁D ato ' ▁Ad nan @ Mad ▁Isa ▁D ato ' ▁Moh amed ▁H aj i ▁Dar us ▁En .