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v2.4.1.9

Condensed Financial Statements of Parent Company (Schedule of Condensed Statements of Income) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |
Total interest income | $ 701,471 us-gaap_InterestAndDividendIncomeOperating | $ 642,500 us-gaap_InterestAndDividendIncomeOperating | $ 631,612 us-gaap_InterestAndDividendIncomeOperating
Interest expense | 14,537 us-gaap_InterestExpense | 21,945 us-gaap_InterestExpense | 26,751 us-gaap_InterestExpense
Salaries and employee benefits | 292,349 us-gaap_SalariesAndWages | 273,692 us-gaap_SalariesAndWages | 258,752 us-gaap_SalariesAndWages
Other | 167,656 us-gaap_OtherNoninterestExpense | 152,077 us-gaap_OtherNoninterestExpense | 139,469 us-gaap_OtherNoninterestExpense
Income before income taxes and equity in undistributed earnings of subsidiaries | 336,024 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 290,881 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 308,475 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax benefit | (58,047)us-gaap_IncomeTaxExpenseBenefit | (53,015)us-gaap_IncomeTaxExpenseBenefit | (70,523)us-gaap_IncomeTaxExpenseBenefit
Net income | 277,977 us-gaap_NetIncomeLoss | 237,866 us-gaap_NetIncomeLoss | 237,952 us-gaap_NetIncomeLoss
Less: Preferred stock dividends | 8,063 us-gaap_PreferredStockDividendsAndOtherAdjustments | 6,719 us-gaap_PreferredStockDividendsAndOtherAdjustments | 0 us-gaap_PreferredStockDividendsAndOtherAdjustments
Net income available to common shareholders | 269,914 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 231,147 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 237,952 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividend income paid by Frost Bank | 114,439 us-gaap_DividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 144,642 us-gaap_DividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 143,623 us-gaap_DividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Dividend income paid by non-banks | 4,323 cfr_DividendIncomePaidByNonBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,819 cfr_DividendIncomePaidByNonBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,077 cfr_DividendIncomePaidByNonBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest and other income | 69 us-gaap_InterestAndOtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 79 us-gaap_InterestAndOtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 308 us-gaap_InterestAndOtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total interest income | 118,831 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 147,540 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 147,008 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense | 3,381 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,365 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,512 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Salaries and employee benefits | 1,218 us-gaap_SalariesAndWages / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,175 us-gaap_SalariesAndWages / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,167 us-gaap_SalariesAndWages / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other | 8,526 us-gaap_OtherNoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,735 us-gaap_OtherNoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,727 us-gaap_OtherNoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total expenses | 13,125 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 15,275 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16,406 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income taxes and equity in undistributed earnings of subsidiaries | 105,706 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 132,265 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 130,602 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefit | 6,702 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,845 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,463 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed earnings of subsidiaries | 165,569 cfr_EquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 97,756 cfr_EquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 99,887 cfr_EquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income | 277,977 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 237,866 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 237,952 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Less: Preferred stock dividends | 8,063 us-gaap_PreferredStockDividendsAndOtherAdjustments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,719 us-gaap_PreferredStockDividendsAndOtherAdjustments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PreferredStockDividendsAndOtherAdjustments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income available to common shareholders | $ 269,914 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 231,147 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 237,952 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Amount of operating dividend income on securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.2) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 9 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1, 2 , 3, 4, 5 -Article 9 + Details
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- Definition The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business). + References No definition available. + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e565-108580 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 + Details
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- Definition Other noninterest expenses that are not separately presented in any other noninterest expense category. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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- Definition Expenditures for salaries other than officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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