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SIGNIFICANT ACCOUNTING POLICIES - Subsidiaries (Details) - COP ($)
$ in Millions
 12 Months Ended
Jul. 27, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Apr. 04, 2022
Trust rights of the Nomad Salitre          
SIGNIFICANT ACCOUNTING POLICIES          
Percentage of trust rights held         100.00%
Fiduciaria Bancolombia S.A. Sociedad Fiduciaria          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Trust Trust Trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   98.81% 98.81% 98.81%  
Banca de Inversion Bancolombia S.A. Corporacion Financiera          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Investment banking Investment banking Investment banking  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Valores Bancolombia S.A. Comisionista de Bolsa          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Securities brokerage Securities brokerage Securities brokerage  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Wompi S.A.S. (Before Vlipco S.A.S.)          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia    
BUSINESS   Technology services provider Technology services provider    
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   99.98% 94.77%    
Renting Colombia S.A.S.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Operating leasing Operating leasing Operating leasing  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Transportempo S.A.S.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Transportation Transportation Transportation  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Inversiones CFNS S.A.S.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Investments Investments Investments  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   99.94% 99.94% 99.94%  
Negocios Digitales Colombia S.A.S. (Before Pasarela Colombia S.A.S)          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Payment solutions Payment solutions Payment solutions  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Fondo de Capital Privado Fondo Inmobiliario Colombia          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Real estate investment fund Real estate investment fund Real estate investment fund  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   80.47% 49.96% 49.96%  
P.A. Inmuebles CEM          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Mercantil trust Mercantil trust Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   80.47% 49.96% 49.96%  
P.A. Calle 92 FIC-11          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Mercantil trust Mercantil trust Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   52.31% 32.47% 32.47%  
P.A. FIC Edificio Corfinsura          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Mercantil trust Mercantil trust Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   80.47% 49.96% 49.96%  
P.A. FIC-A5          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Mercantil trust Mercantil trust Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   80.47% 49.96% 49.96%  
P.A. FIC Inmuebles          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Mercantil trust Mercantil trust Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   80.47% 49.96% 49.96%  
P.A. FIC Clinica de Prado          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Mercantil trust Mercantil trust Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   62.00% 38.49% 38.49%  
P. A. FIC A6          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Mercantil trust Mercantil trust Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   80.47% 49.96% 49.96%  
P.A. Central Point          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Mercantil trust Mercantil trust Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   60.35% 37.47% 37.47%  
Fideicomiso Irrevocable de Garantia, Fuente de Pago y Administracion Inmobiliaria Polaris          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Mercantil trust Mercantil trust Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   80.47% 49.96% 49.96%  
P.A. Fideicomiso Twins Bay          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Mercantil trust Mercantil trust Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   80.47% 49.96% 49.96%  
Fideicomiso Lote Av San Martn          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Mercantil trust Mercantil trust Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   80.47% 49.96% 49.96%  
P.A. Fideicomiso Lote 30          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Mercantil trust Mercantil trust Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   80.47% 49.96% 49.96%  
Fideicomiso Fondo Inmobiliario Bancolombia          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia    
BUSINESS   Mercantil trust Mercantil trust    
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   80.47% 17.54%    
P.A. Florencia Ferrara          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia      
BUSINESS   Mercantil trust      
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   44.26%      
P.A. Flor Morado Plaza          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia      
BUSINESS   Mercantil trust      
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   80.47%      
Valores Simesa S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Investments Investments Investments  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   66.33% 66.82% 67.11%  
Fideicomiso Lote Abelardo Castro          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION       Colombia  
BUSINESS       Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK       66.77%  
Fideicomiso Lote Distrito Vera B1B2          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Mercantil trust Mercantil trust Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   66.00% 66.49% 66.77%  
Fideicomiso Lote Distrito Vera B3B4          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia Colombia Colombia  
BUSINESS   Mercantil trust Mercantil trust Mercantil trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   66.00% 66.49% 66.77%  
Fideicomiso Lote B6 Ciudad del Rio          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia      
BUSINESS   Mercantil trust      
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   66.00%      
P.A. FAI CALLE 77          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia      
BUSINESS   Real estate investment fund      
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   98.00%      
P.A. NOMAD SALITRE          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia      
BUSINESS   Real estate investment fund      
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   98.00%      
P.A. NOMAD SALITRE | Trust rights of the Nomad Salitre          
SIGNIFICANT ACCOUNTING POLICIES          
Percentage of trust rights held         100.00%
P.A. MERCURIO          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia      
BUSINESS   Real estate investment fund      
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00%      
Wenia Ltd.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Bermudas      
BUSINESS   Technology services      
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00%      
Wenia S.A.S.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia      
BUSINESS   Technology services      
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00%      
Nequi S.A. Compania de Financiamiento          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Colombia      
BUSINESS   Financial services      
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00%      
Percentage of operations to be operated as a digital bank 100.00%        
Bancolombia Panama S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Panama Panama Panama  
BUSINESS   Banking Banking Banking  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Sistemas de Inversiones y Negocios S.A. Sinesa          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Panama Panama Panama  
BUSINESS   Investments Investments Investments  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Banagricola S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Panama Panama Panama  
BUSINESS   Holding Holding Holding  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   99.17% 99.17% 99.17%  
Banistmo S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Panama Panama Panama  
BUSINESS   Banking Banking Banking  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Banistmo Investment Corporation S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Panama Panama Panama  
BUSINESS   Trust Trust Trust  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Financomer S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION       Panama  
BUSINESS       Financial services  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK       100.00%  
Leasing Banistmo S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Panama Panama Panama  
BUSINESS   Leasing Leasing Leasing  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Valores Banistmo S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Panama Panama Panama  
BUSINESS   Securities brokerage Securities brokerage Securities brokerage  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Banistmo Panama Fondo de Inversion S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Panama Panama Panama  
BUSINESS   Holding Holding Holding  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Suvalor Renta Fija Internacional Corto Plazo S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION     Panama Panama  
BUSINESS     Collective investment fund Collective investment fund  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK     100.00% 100.00%  
Fondo Renta Sostenible Global S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION     Panama Panama  
BUSINESS     Collective investment fund Collective investment fund  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK     100.00% 100.00%  
Banistmo Capital Markets Group Inc.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Panama Panama Panama  
BUSINESS   Real estate broker Real estate broker Real estate broker  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Anavi Investment Corporation S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Panama Panama Panama  
BUSINESS   Real estate Real estate Real estate  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Desarrollo de Oriente S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Panama Panama Panama  
BUSINESS   Real estate Real estate Real estate  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Steens Enterprises S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Panama Panama Panama  
BUSINESS   Portfolio holder Portfolio holder Portfolio holder  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Ordway Holdings S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Panama Panama Panama  
BUSINESS   Real estate broker Real estate broker Real estate broker  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Grupo Agromercantil Holding S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Panama Panama Panama  
BUSINESS   Holding Holding Holding  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Banco Agromercantil de Guatemala S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Guatemala Guatemala Guatemala  
BUSINESS   Banking Banking Banking  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   99.68% 99.66% 99.59%  
Seguros Agromercantil de Guatemala S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Guatemala Guatemala Guatemala  
BUSINESS   Insurance agency Insurance agency Insurance agency  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   79.92% 79.92% 79.90%  
Financiera Agromercantil S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Guatemala Guatemala Guatemala  
BUSINESS   Financial services Financial services Financial services  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Agrovalores S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Guatemala Guatemala Guatemala  
BUSINESS   Securities brokerage Securities brokerage Securities brokerage  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Arrendadora Agromercantil S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Guatemala Guatemala Guatemala  
BUSINESS   Operating Leasing Operating Leasing Operating Leasing  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Agencia de Seguros y Fianzas Agromercantil S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Guatemala Guatemala Guatemala  
BUSINESS   Insurance agency Insurance agency Insurance agency  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Asistencia y Ajustes S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Guatemala Guatemala Guatemala  
BUSINESS   Services Services Services  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Serproba S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Guatemala Guatemala Guatemala  
BUSINESS   Maintenance and remodelling services Maintenance and remodelling services Maintenance and remodelling  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Servicios de Formalizacion S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Guatemala Guatemala Guatemala  
BUSINESS   Loans formalization Loans formalization Loans formalization  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Conserjeria, Mantenimiento y Mensajeria S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Guatemala Guatemala Guatemala  
BUSINESS   Maintenance services Maintenance services Maintenance services  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Mercom Bank Ltd.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Barbados Barbados Barbados  
BUSINESS   Banking Banking Banking  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   99.68% 99.66% 99.59%  
New Alma Enterprises Ltd.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Bahamas Bahamas Bahamas  
BUSINESS   Investments Investments Investments  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   99.68% 99.66% 99.59%  
Bancolombia Puerto Rico Internacional Inc.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Puerto Rico Puerto Rico Puerto Rico  
BUSINESS   Banking Banking Banking  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Bancolombia Cayman S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Cayman Islands Cayman Islands Cayman Islands  
BUSINESS   Banking Banking Banking  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00% 100.00%  
Banco Agricola S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   El Salvador El Salvador El Salvador  
BUSINESS   Banking Banking Banking  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   97.36% 97.36% 97.36%  
Arrendadora Financiera S.A. Arfinsa          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   El Salvador El Salvador El Salvador  
BUSINESS   Leasing Leasing Leasing  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   97.37% 97.37% 97.37%  
Credibac S.A. de C.V.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   El Salvador El Salvador El Salvador  
BUSINESS   Electronic payment platform Electronic payment platform Electronic payment platform  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   97.36% 97.36% 97.36%  
Valores Banagricola S.A. de C.V.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   El Salvador El Salvador El Salvador  
BUSINESS   Securities brokerage Securities brokerage Securities brokerage  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   98.89% 98.89% 98.89%  
Inversiones Financieras Banco Agricola S.A. IFBA          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   El Salvador El Salvador El Salvador  
BUSINESS   Holding Holding Holding  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   98.89% 98.89% 98.89%  
Gestora de Fondos de Inversion Banagricola S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   El Salvador El Salvador El Salvador  
BUSINESS   Administers investment funds Administers investment funds Administers investment funds  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   98.89% 98.89% 98.89%  
Bagricola Costa Rica S.A.          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   Costa Rica Costa Rica Costa Rica  
BUSINESS   Outsourcing Outsourcing Outsourcing  
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   99.17% 99.17% 99.17%  
Bancolombia Capital Holdings USA LLC          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   United States United States    
BUSINESS   Holding Holding    
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00%    
Bancolombia Capital Adviser LLC          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   United States United States    
BUSINESS   Investment advisor Investment advisor    
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00%    
Bancolombia Capital LLC          
SIGNIFICANT ACCOUNTING POLICIES          
JURISDICTION OF INCORPORATION   United States United States    
BUSINESS   Securities brokerage Securities brokerage    
PROPORTION OF OWNERSHIP INTEREST AND VOTING POWER HELD BY THE BANK   100.00% 100.00%    
Banistmo and Bancolombia Panama          
SIGNIFICANT ACCOUNTING POLICIES          
Loan and financial lease reserves recognized   $ 1,036,919 $ 1,428,964