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v2.4.1.9

Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Stock option exercises/deferred stock unit conversions, shares | 594,231 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 1,319,786 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 206,366 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Non-vested stock awards, shares | 7,620 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation | 13,040 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation | 16,850 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Non-vested stock units, shares | 24,430 cfr_StockUnitsIssuedDuringPeriodSharesShareBasedCompensation | 24,970 cfr_StockUnitsIssuedDuringPeriodSharesShareBasedCompensation | 32,280 cfr_StockUnitsIssuedDuringPeriodSharesShareBasedCompensation
Stock Issued During Period, Shares, Acquisitions | 2,000,000 us-gaap_StockIssuedDuringPeriodSharesAcquisitions | 0 us-gaap_StockIssuedDuringPeriodSharesAcquisitions | 0 us-gaap_StockIssuedDuringPeriodSharesAcquisitions
Issuance of preferred stock, shares | 0 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 6,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |
Purchase of treasury stock, shares | 18,871 us-gaap_TreasuryStockSharesAcquired | 2,245,572 us-gaap_TreasuryStockSharesAcquired | 7,960 us-gaap_TreasuryStockSharesAcquired
Approximate cash dividends declared on preferred stock, per share | $ 1.34 us-gaap_PreferredStockDividendsPerShareDeclared | $ 1.12 us-gaap_PreferredStockDividendsPerShareDeclared |
Cash dividends - common stock, per share | $ 2.03 us-gaap_CommonStockDividendsPerShareCashPaid | $ 1.98 us-gaap_CommonStockDividendsPerShareCashPaid | $ 1.90 us-gaap_CommonStockDividendsPerShareCashPaid

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