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19. EMPLOYEES BENEFITS (Details 1) - Number
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
FAF [Member]    
Disclosure of defined benefit plans [line items]    
Discount rate 7.49% 7.28%
Inflation rate 3.25% 3.80%
Wage growth rate 3.49% 4.47%
Number of active participants 6,495 6,796
Number of beneficiary participants assisted 7,206 6,834
FAF [Member] | Schedule of mortality [Member]    
Disclosure of defined benefit plans [line items]    
Schedule of mortality & disabled mortality AT-2000 smoothed by 10% AT-2000
FAF [Member] | Schedule of disabled mortality [Member]    
Disclosure of defined benefit plans [line items]    
Schedule of mortality & disabled mortality CSO-58 RRB-1983
Plans II [Member]    
Disclosure of defined benefit plans [line items]    
Discount rate 7.25% 7.02%
Inflation rate 3.25% 3.80%
Plans II [Member] | Schedule of mortality [Member]    
Disclosure of defined benefit plans [line items]    
Schedule of mortality & disabled mortality AT-2000 smoothed by 10% AT-2000
Plans II [Member] | Schedule of disabled mortality [Member]    
Disclosure of defined benefit plans [line items]    
Schedule of mortality & disabled mortality CSO-58 RRB-1983