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Loans Loans - Restructured Loans Past Due in Excess of 90 Days on Financing Receivables (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 USD ($) Item | Mar. 31, 2021 USD ($) Item
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number Of Restructured Loans Past Due In Excess of 90 Days At Period-End | Item | 2 | 2
Dollar amount of previously restructured loans past due | $ 572 | $ 1,392
Charge-offs of restructured loans recognized on previously restructured loans | $ 723 | $ 1,433

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- Definition Charge Off Of Previously Restructures Loans + References No definition available. + Details
Name: | cfr_ChargeOffOfPreviouslyRestructuresLoans
Namespace Prefix: | cfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number Of Restructured Loans Past Due In Excess of 90 Days At Period-End + References No definition available. + Details
Name: | cfr_NumberOfRestructuredLoansPastDueInExcessof90DaysAtPeriodEnd
Namespace Prefix: | cfr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Previously Restructured Loans Past Due + References No definition available. + Details
Name: | cfr_PreviouslyRestructuredLoansPastDue
Namespace Prefix: | cfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration