. ▁In ▁ 1 9 3 7 , ▁the ▁Bank ▁began ▁its ▁annual ▁Cit iz ens ' ▁Hol iday ▁Sing . ▁ ▁The ▁We ather ▁Ball ▁on ▁the ▁bank ▁headquarters ▁was ▁first ▁ill umin ated ▁August ▁ 3 0 , ▁ 1 9 5 6 . ▁ ▁The ▁ball ▁is ▁a ▁regular ▁be acon ▁in ▁the ▁city ▁except ▁from ▁ 1 9 7 4 ▁until ▁January ▁ 1 , ▁ 1 9 7 8 , ▁when ▁it ▁was ▁turned ▁off ▁during ▁the ▁ 1 9 7 0 s ▁energy ▁crisis . ▁ ▁Cit iz ens ▁Bank ing ▁Corporation ▁Cit iz ens ▁Com mer cial ▁& ▁Sav ings ▁Bank ▁formed ▁a ▁holding ▁company , ▁Cit iz ens ▁Bank ing ▁Corporation , ▁in ▁ 1 9 8 1 ▁to ▁ac quire ▁additional ▁banks . ▁B anks ▁acquired ▁were ▁Gray ling ▁State ▁Bank ▁and ▁State ▁Bank ▁of ▁Stand ish ▁in ▁ 1 9 8 4 . ▁Cit iz ens ▁Bank ing ▁acquired ▁Second ▁National ▁Bank ▁of ▁S ag ina w ▁and ▁Second ▁National ▁Bank ▁of ▁Bay ▁City ▁in ▁ 1 9 8 5 . ▁On ▁November ▁ 6 , ▁ 1 9 8 6 , ▁Cit iz ens ▁Bank ing ▁indicated ▁that ▁will ▁purchase ▁National ▁Bank ▁of ▁Illinois ▁as ▁its ▁first ▁non - Mich igan ▁ac quisition ▁followed ▁in ▁ 1 9 8 7 ▁with ▁the ▁purchase ▁of ▁Com mer cial ▁National ▁Bank ▁of ▁Ber w yn , ▁Illinois . ▁ ▁David ▁T . ▁Dort , ▁son ▁of ▁J . ▁Dallas ▁Dort , ▁retired ▁April ▁