XML 88 R71.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Loans (Non-Accrual Loans, Segregated by Class of Loan and Year of Origination) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Nonaccrual | $ 78,866 | $ 60,907
Commercial Portfolio Segment [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 1,630,146 | 1,619,306
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 567,373 | 768,246
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 508,217 | 499,987
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 289,789 | 364,446
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 308,636 | 182,089
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 279,503 | 219,766
Financing Receivable, Excluding Accrued Interest, Revolving | 2,413,231 | 2,247,752
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 112,637 | 65,590
Financing Receivable, Nonaccrual | 46,004 | 19,545
Commercial and Industrial Total Energy Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 388,092 | 277,722
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 24,187 | 61,500
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 38,109 | 76,103
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 18,161 | 3,835
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 1,608 | 6,876
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 4,367 | 4,541
Financing Receivable, Excluding Accrued Interest, Revolving | 647,099 | 495,329
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 7,272 | 10,831
Financing Receivable, Nonaccrual | 4,079 | 11,500
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 1,450,749 | 1,645,223
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,347,348 | 1,785,624
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 1,638,136 | 1,253,062
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 1,160,877 | 811,574
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 704,334 | 522,566
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 1,095,642 | 953,768
Financing Receivable, Excluding Accrued Interest, Revolving | 209,545 | 229,733
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 97,816 | 100,370
Financing Receivable, Nonaccrual | 21,920 | 22,420
Construction Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 769,805 | 560,720
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 610,434 | 576,374
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 541,575 | 344,641
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 171,695 | 28,063
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 2,727 | 296
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 559 | 1,613
Financing Receivable, Excluding Accrued Interest, Revolving | 167,122 | 169,017
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 159 | 0
Financing Receivable, Nonaccrual | 0 | 0
Total consumer real estate loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Nonaccrual | 6,511 | 7,442
Consumer Loan [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Nonaccrual | 352 | 0
Nonperforming Financial Instruments [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 28,675 | 25,974
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 5,985 | 359
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 7,286 | 1,785
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 4,345 | 1,079
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 1,731 | 6,310
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 7,172 | 2,209
Financing Receivable, Excluding Accrued Interest, Revolving | 4,475 | 5,711
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 19,197 | 17,480
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 20,819 | 0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 2,915 | 359
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 4,053 | 1,635
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 1,592 | 985
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 335 | 1,257
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 2,144 | 1,006
Financing Receivable, Excluding Accrued Interest, Revolving | 1,186 | 9
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 12,960 | 14,294
Nonperforming Financial Instruments [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0 | 5,875
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0 | 56
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 56 | 1,321
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 1,321 | 0
Financing Receivable, Excluding Accrued Interest, Revolving | 2,702 | 4,102
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0 | 146
Nonperforming Financial Instruments [Member] | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 7,856 | 20,099
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 2,671 | 0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 3,233 | 150
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 2,753 | 0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 1,248 | 1,451
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 1,505 | 720
Financing Receivable, Excluding Accrued Interest, Revolving | 0 | 0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 2,654 | 0
Nonperforming Financial Instruments [Member] | Construction Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Revolving | 0 | 0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0 | 0
Nonperforming Financial Instruments [Member] | Total consumer real estate loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 47 | 0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0 | 38
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 92 | 2,281
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 2,202 | 483
Financing Receivable, Excluding Accrued Interest, Revolving | 587 | 1,600
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 3,583 | 3,040
Nonperforming Financial Instruments [Member] | Consumer Loan [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 352 | 0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0 | 0
Financing Receivable, Excluding Accrued Interest, Revolving | 0 | 0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | $ 0 | $ 0

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of revolving financing receivable converted to term loan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (3) -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (2) -Publisher SEC Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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_LoansAndLeasesReceivableDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cfr_CommercialandIndustrialTotalEnergyLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cfr_CommercialRealEstateBuildingsLandAndOtherLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cfr_TotalconsumerrealestateloansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |