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19. EMPLOYEES BENEFITS (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
FAF [Member]    
Composition of actuarial assets and liabilities    
Present value of actuarial liabilities R$ 3,377,234 R$ 3,412,120
Fair value of actuarial assets (3,553,215) (3,771,792)
(Surplus) Deficit (175,981) (359,672)
Irrecoverable surplus - (asset ceiling) 175,981 359,672
Net acturial asset
Rollforward of irrecoverable surplus    
Beginning balance of irrecoverable surplus 359,672 695,367
Interest on irrecoverable surplus 26,184 64,113
Changes in irrecoverable surplus during the year (209,875) (399,808)
Ending balance of irrecoverable surplus 175,981 359,672
Rollforward of present value of actuarial liabilities    
Beginning balance of the present value of liabilities 3,412,120 2,498,564
Interest on actuarial obligations 242,746 223,848
Current service cost 42,106 28,172
Past service cost - plan changes (4,223)
Benefit paid (154,096) (142,390)
Actuarial losses - experience 148,984 85,002
Actuarial losses - hypothesis (310,403) 718,924
Ending balance of actuarial liabilities 3,377,234 3,412,120
Rollforward of the fair value of the assets    
Beginning balance of the fair value of plan assets (3,771,792) (3,193,931)
Interest income on assets plan (268,930) (287,961)
Benefit paid 154,096 142,390
Return on assets higher (lower) than projection 333,411 (432,290)
Ending Balance of the fair value of the assets (3,553,215) (3,771,792)
Rollforward of comprehensive income    
Beginning balance 28,172 27,972
Reversion to accumulated losses (28,172) (27,972)
Actuarial gains (losses) 161,419 (803,925)
Return on assets higher (lower) than projection (333,411) 432,289
Changes on irrecoverable surplus 209,875 399,808
Ending balance 37,883 28,172
Costs recognized in statement of income    
Current service costs (42,106) (28,172)
Interest on actuarial obligations (242,746) (223,848)
Projected return on assets 268,930 287,961
Interest on irrecoverable surplus (26,184) (64,113)
Past service cost - plan changes 4,223
Costs recognized in statement of income (37,883) (28,172)
Estimated costs for the next period    
Costs of defined benefit (26,741) (42,106)
Estimated costs for the next period (26,741) (42,106)
Plans II [Member]    
Composition of actuarial assets and liabilities    
Present value of actuarial liabilities 23,256 19,550
Fair value of actuarial assets (24,170) (29,580)
(Surplus) Deficit (914) (10,030)
Irrecoverable surplus - (asset ceiling) 167 6,777
Net acturial asset (747) (3,253)
Rollforward of irrecoverable surplus    
Beginning balance of irrecoverable surplus 6,777 8,502
Interest on irrecoverable surplus 476 782
Changes in irrecoverable surplus during the year (7,086) (2,507)
Ending balance of irrecoverable surplus 167 6,777
Rollforward of present value of actuarial liabilities    
Beginning balance of the present value of liabilities 19,550 17,447
Interest on actuarial obligations 1,324 1,544
Current service cost
Past service cost - plan changes
Benefit paid (1,612) (1,353)
Actuarial losses - experience 5,273 (1,176)
Actuarial losses - hypothesis (1,279) 3,088
Ending balance of actuarial liabilities 23,256 19,550
Rollforward of the fair value of the assets    
Beginning balance of the fair value of plan assets (29,580) (27,819)
Interest income on assets plan (2,028) (2,497)
Benefit paid 1,612 1,353
Return on assets higher (lower) than projection 5,826 (617)
Ending Balance of the fair value of the assets (24,170) (29,580)
Rollforward of comprehensive income    
Beginning balance 1,213 (567)
Reversion to accumulated losses (1,213) 567
Actuarial gains (losses) (3,994) (1,911)
Return on assets higher (lower) than projection (5,826) 617
Changes on irrecoverable surplus 7,086 2,507
Ending balance (2,734) 1,213
Costs recognized in statement of income    
Current service costs
Interest on actuarial obligations (1,324) (1,544)
Projected return on assets 2,028 2,497
Interest on irrecoverable surplus (476) (782)
Past service cost - plan changes
Costs recognized in statement of income 228 171
Estimated costs for the next period    
Costs of defined benefit 54 228
Estimated costs for the next period R$ 54 R$ 228