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Consolidated Statements of Changes in Shareholders' Equity (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]    
Total shareholders’ equity at beginning of period $ 2,851,403us-gaap_StockholdersEquity $ 2,514,161us-gaap_StockholdersEquity
Net income 72,163us-gaap_NetIncomeLoss 61,188us-gaap_NetIncomeLoss
Other comprehensive income (loss) 18,305us-gaap_OtherComprehensiveIncomeLossNetOfTax 2,314us-gaap_OtherComprehensiveIncomeLossNetOfTax
Stock option exercises (14,350 shares in 2015 and 329,825 shares in 2014) 728us-gaap_ProceedsFromStockOptionsExercised 17,279us-gaap_ProceedsFromStockOptionsExercised
Stock compensation expense recognized in earnings 2,562us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 2,136us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Tax benefits related to stock compensation 74us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation 1,344us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Cash dividends – preferred stock (approximately $0.34 per share in both 2015 and in 2014) (2,016)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock (2,016)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Cash dividends – common stock ($0.51 per share in 2015 and $0.50 per share in 2014) (32,288)us-gaap_PaymentsOfDividendsCommonStock (30,487)us-gaap_PaymentsOfDividendsCommonStock
Total shareholders’ equity at end of period $ 2,910,931us-gaap_StockholdersEquity $ 2,565,919us-gaap_StockholdersEquity