Hi Kevin,
If you have a direct debit acc. which is paying your electric,tel or etc..
this should be enough for the bank. Or living permit which is 'ikamet tezkeresi' as turkish you can give a copy of this to the banks. From Turkish customers they will offer these forms till 15th of December. We didnt have special message for foreigners.
in case of any help that you need please do not hesitate to contact me.
regards.
Alper