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Related Party Transactions (Other assets and liabilities, Income and expenses with related parties) (Details) - CLP ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Assets |  |
Cash and due from banks | $ 57,563 | $ 51,222
Transactions in the course of collection | 13,249 | 7,537
Derivative instruments | 323,186 | 147,046
Financial assets |  | 15,115
Other assets | 114,536 | 50,691
Total | 508,534 | 271,611
Liabilities |  |
Demand deposits | 173,715 | 194,503
Transactions in the course of payment | 16,116 | 5,637
Cash collateral on securities lent and repurchase agreements | 25,227 | 34,710
Savings accounts and time deposits | 169,322 | 267,925
Derivative instruments | 370,356 | 151,398
Borrowings from financial institutions | 251,555 | 242,405
Other liabilities | 51,814 | 60,307
Total | 1,058,105 | 956,885
Type of income or expense recognized |  |
Interest and revenue income | 28,140 | 19,354
Interest and revenue expense | 9,332 | 15,941
Fees and commission income | 65,995 | 66,387
Fees and commission expense | 69,843 | 62,614
Derivative instruments income | 33,540 | 33,814
Derivative instruments expense | 97,416 | 42,898
Other financial operations income | 1 |
Provision for credit risk income |  | 290
Provision for credit risk expense | 252 |
Operating expenses | 100,389 | 85,979
Other income | 3,723 | 458
Other expense | 56 | 32
Comder Contraparte Central S.A |  |
Type of income or expense recognized |  |
Net loss | $ 96,075 | $ 31,649

X
- Definition The amount of total assets, resulting from related party transactions. + References No definition available. + Details
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Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of borrowings from financial institutions, resulting from related party transactions. + References No definition available. + Details
Name: | bch_BorrowingsFromFinancialInstitutionsRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of cash and due from banks, resulting from related party transactions. + References No definition available. + Details
Name: | bch_CashAndDueFromBanksRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of cash collateral on securities lent and repurchase agreements, resulting from related party transactions. + References No definition available. + Details
Name: | bch_CashCollateralOnSecuritiesLentAndRepurchaseAgreementsRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of demand deposits, resulting from related party transactions. + References No definition available. + Details
Name: | bch_DemandDepositsRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of derivative instruments assets, resulting from related party transactions. + References No definition available. + Details
Name: | bch_DerivativeInstrumentsAssetsRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of derivative instruments expense, resulting from related party transactions. + References No definition available. + Details
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Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of derivative instruments income, resulting from related party transactions. + References No definition available. + Details
Name: | bch_DerivativeInstrumentsIncomeRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of derivative instruments liability, resulting from related party transactions. + References No definition available. + Details
Name: | bch_DerivativeInstrumentsLiabilityRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of fees and commission expense, resulting from related party transactions. + References No definition available. + Details
Name: | bch_FeesAndCommissionExpenseRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of fees and commission income, resulting from related party transactions. + References No definition available. + Details
Name: | bch_FeesAndCommissionIncomeRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of financial assets, resulting from related party transactions. + References No definition available. + Details
Name: | bch_FinancialAssetsRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | bch_IncomeAndExpenseRecognizedAbstract
Namespace Prefix: | bch_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of Interest and revenue expense, resulting from related party transactions. + References No definition available. + Details
Name: | bch_InterestAndRevenueExpenseRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of Interest and revenue income, resulting from related party transactions. + References No definition available. + Details
Name: | bch_InterestAndRevenueIncomeRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of total liabilities, resulting from related party transactions. + References No definition available. + Details
Name: | bch_LiabilitiesRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of income loss, resulting from related party transactions. + References No definition available. + Details
Name: | bch_NetIncomeLossRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of operating expenses, resulting from related party transactions. + References No definition available. + Details
Name: | bch_OperatingExpensesRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of other assets, resulting from related party transactions. + References No definition available. + Details
Name: | bch_OtherAssetsRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of other expenses, resulting from related party transactions. + References No definition available. + Details
Name: | bch_OtherExpensesRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of other financial operations income, resulting from related party transactions. + References No definition available. + Details
Name: | bch_OtherFinancialOperationsIncomeRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of other income, resulting from related party transactions. + References No definition available. + Details
Name: | bch_OtherIncomeRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of other liabilities, resulting from related party transactions. + References No definition available. + Details
Name: | bch_OtherLiabilitiesRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of provision for credit risk, resulting from related party transactions. + References No definition available. + Details
Name: | bch_ProvisionForCreditRiskRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of provision for credit risk resulting from related party transactions, reversed. + References No definition available. + Details
Name: | bch_ProvisionForCreditRiskRelatedPartyTransactionsReversal
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of savings accounts and time deposits, resulting from related party transactions. + References No definition available. + Details
Name: | bch_SavingsAccountsAndTimeDepositsRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of transactions in the course of collection, resulting from related party transactions. + References No definition available. + Details
Name: | bch_TransactionsInCourseOfCollectionRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of transactions in the course of payment, resulting from related party transactions. + References No definition available. + Details
Name: | bch_TransactionsInCourseOfPaymentRelatedPartyTransactions
Namespace Prefix: | bch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_AssetsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_LiabilitiesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=bch_ComderContraparteCentralS.aMember
Namespace Prefix: |
Data Type: | na
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