MATERIAL ACCOUNTING POLICIES - Funds administration (Details) $ in Millions	12 Months Ended
Dec. 31, 2024 COP ($) $ / $	Dec. 31, 2023 COP ($) $ / $	Dec. 31, 2022 $ / $	Dec. 31, 2021 $ / $
MATERIAL ACCOUNTING POLICIES
Market representative rate \| $ / $	4,409.15	3,822.05	4,810.2	3,981.16
Fondo de Capital Privado Fondo Inmobiliario Colombia
MATERIAL ACCOUNTING POLICIES
Country	Colombia	Colombia	Colombia
Percentage of ownership interest held by the Bank	80.47%	80.47%	80.47%
Assets managed	$ 6,039,891	$ 5,503,022
Fideicomiso Lote Distrito Vera B1B2
MATERIAL ACCOUNTING POLICIES
Country	Colombia	Colombia	Colombia
Percentage of ownership interest held by the Bank	62.44%	64.61%	66.00%
Assets managed	$ 26,367	$ 25,073
Fideicomiso Lote Distrito Vera B3B4
MATERIAL ACCOUNTING POLICIES
Country	Colombia	Colombia	Colombia
Percentage of ownership interest held by the Bank	0.00%	64.61%	66.00%
Assets managed	$ 0	$ 56,295
Fideicomiso Lote B6 Ciudad del Rio
MATERIAL ACCOUNTING POLICIES
Country	Colombia	Colombia	Colombia
Percentage of ownership interest held by the Bank	0.00%	0.00%	66.00%
Assets managed	$ 0	$ 0
Banistmo Panama Fondo de Inversion S.A.
MATERIAL ACCOUNTING POLICIES
Country	Panama	Panama	Panama
Percentage of ownership interest held by the Bank	100.00%	100.00%	100.00%
Assets managed	$ 126,092	$ 132,496

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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