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Other Comprehensive Income (Loss) (Reclassifications out of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]                      
Interest expense                 $ (109,408)us-gaap_InterestExpense $ (118,822)us-gaap_InterestExpense $ (150,023)us-gaap_InterestExpense
Income tax (expense) benefit (25,756)us-gaap_IncomeTaxExpenseBenefit (25,868)us-gaap_IncomeTaxExpenseBenefit (27,078)us-gaap_IncomeTaxExpenseBenefit (28,608)us-gaap_IncomeTaxExpenseBenefit (21,130)us-gaap_IncomeTaxExpenseBenefit (27,765)us-gaap_IncomeTaxExpenseBenefit (27,371)us-gaap_IncomeTaxExpenseBenefit (16,979)us-gaap_IncomeTaxExpenseBenefit (107,310)us-gaap_IncomeTaxExpenseBenefit (93,245)us-gaap_IncomeTaxExpenseBenefit 798,732us-gaap_IncomeTaxExpenseBenefit
Investment securities gains, net                 1,331us-gaap_GainLossOnSaleOfSecuritiesNet 2,945us-gaap_GainLossOnSaleOfSecuritiesNet 39,142us-gaap_GainLossOnSaleOfSecuritiesNet
Salaries and other personnel expense                 (744,998)us-gaap_NoninterestExpense (741,537)us-gaap_NoninterestExpense (816,237)us-gaap_NoninterestExpense
Net income available to common shareholders 50,612us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [1] 44,229us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [1] 44,313us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [1] 45,857us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [1] 35,850us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [2] 37,188us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [2] 30,717us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [2] 14,798us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [2] 185,011us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 118,553us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 771,506us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]                      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]                      
Interest expense                 (448)us-gaap_InterestExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 (447)us-gaap_InterestExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
Income tax (expense) benefit                 173us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 173us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
Net income available to common shareholders                 (275)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 (274)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]                      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]                      
Income tax (expense) benefit                 (513)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 (1,134)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		  
Investment securities gains, net                 1,331us-gaap_GainLossOnSaleOfSecuritiesNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 2,945us-gaap_GainLossOnSaleOfSecuritiesNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		  
Net income available to common shareholders                 818us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 1,811us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		  
Post-retirement Unfunded Health Benefit [Member]                      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]                      
Income tax (expense) benefit                 (56)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 (65)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		  
Salaries and other personnel expense                 144us-gaap_NoninterestExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 170us-gaap_NoninterestExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		  
Net income available to common shareholders                 $ 88us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 $ 105us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		  
[1] The fourth quarter of 2014 results include restructuring charges of $3.5 million.
[2] $10.0 million and restructuring charges of $3.8 million.