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Loans Loans - Restructured Loans Past Due in Excess of 90 Days on Financing Receivables (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 USD ($) Item | Jun. 30, 2020 USD ($) Item
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number Of Restructured Loans Past Due In Excess of 90 Days At Period-End | Item | 1 | 0
Dollar amount of previously restructured loans past due | $ 1,322 | $ 0
Restructured loans on non-accrual status at period end | 4,090 | 7,631
Charge-offs of restructured loans recognized in connection with restructuring | 0 | 0
Charge-offs of restructured loans recognized on previously restructured loans | $ 0 | $ 0

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- Definition Charge Off Of Previously Restructures Loans + References No definition available. + Details
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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 Restructured loans on non-accrual status at period end + References No definition available. + Details
Name: | cfr_Restructuredloansonnonaccrualstatusatperiodend
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

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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration