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Debt And Shareholders' Equity (Narrative) (Details) (USD $)
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Dec. 31, 2014
Feb. 17, 2015
Debt And Shareholders' Equity [Line Items]          
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt is summarized as follows:
(In thousands)
 
March 31, 2015
 
December 31, 2014
 
 
 
 
 
Junior subordinated debentures related to trust preferred securities
 
$
168,043

 
$
168,043

Convertible subordinated notes
 
138,002

 
132,838

Subordinated notes
 
335,341

 
335,798

Senior notes
 
424,901

 
432,385

FHLB advances
 
22,009

 
22,156

Capital lease obligations and other
 
1,025

 
1,062

Total
 
$
1,089,321

 
$
1,092,282

        
Junior Subordinated Notes $ 168,043,000us-gaap_JuniorSubordinatedNotes   $ 168,043,000us-gaap_JuniorSubordinatedNotes $ 168,043,000us-gaap_JuniorSubordinatedNotes  
Convertible Subordinated Debt 138,002,000us-gaap_ConvertibleSubordinatedDebt   138,002,000us-gaap_ConvertibleSubordinatedDebt 132,838,000us-gaap_ConvertibleSubordinatedDebt  
Subordinated Debt 335,341,000us-gaap_SubordinatedDebt   335,341,000us-gaap_SubordinatedDebt 335,798,000us-gaap_SubordinatedDebt  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 13,613,000us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax 71,386,000us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (481,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax (24,747,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax      
Subordinated Debt, Current 223,453,000us-gaap_SubordinatedDebtCurrent   223,453,000us-gaap_SubordinatedDebtCurrent    
Senior Notes 424,901,000us-gaap_SeniorNotes   424,901,000us-gaap_SeniorNotes 432,385,000us-gaap_SeniorNotes  
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances 22,009,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch   22,009,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch 22,156,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch  
Capital Lease Obligations 1,025,000us-gaap_CapitalLeaseObligations   1,025,000us-gaap_CapitalLeaseObligations 1,062,000us-gaap_CapitalLeaseObligations  
Long-term Debt, Gross 1,089,321,000us-gaap_DebtInstrumentCarryingAmount   1,089,321,000us-gaap_DebtInstrumentCarryingAmount 1,092,282,000us-gaap_DebtInstrumentCarryingAmount  
Medium-term Notes 30,300,000us-gaap_MediumTermNotes   30,300,000us-gaap_MediumTermNotes    
Convertible Subordinated Note, Coupon Rate 6.00% [Member]          
Debt And Shareholders' Equity [Line Items]          
Subordinated Borrowing, Interest Rate     0.00%us-gaap_SubordinatedBorrowingInterestRate
/ us-gaap_LongtermDebtTypeAxis
= zion_ConvertibleSubordinatedNoteCouponRate6.00Member		    
Convertible Subordinated Debt, Current 73,397,000us-gaap_ConvertibleSubordinatedDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= zion_ConvertibleSubordinatedNoteCouponRate6.00Member		   73,397,000us-gaap_ConvertibleSubordinatedDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= zion_ConvertibleSubordinatedNoteCouponRate6.00Member		    
Debt Instrument, Maturity Date Sep. 15, 2015        
Subordinated Notes, Coupon Rate 6.00% [Member]          
Debt And Shareholders' Equity [Line Items]          
Subordinated Borrowing, Interest Rate     0.00%us-gaap_SubordinatedBorrowingInterestRate
/ us-gaap_LongtermDebtTypeAxis
= zion_SubordinatedNotesCouponRate6.00Member		    
Subordinated Debt, Current 32,706,000us-gaap_SubordinatedDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= zion_SubordinatedNotesCouponRate6.00Member		   32,706,000us-gaap_SubordinatedDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= zion_SubordinatedNotesCouponRate6.00Member		    
Debt Instrument, Maturity Date Sep. 15, 2015        
Convertible Subordinated Notes, Coupn Rate 5.50% [Member]          
Debt And Shareholders' Equity [Line Items]          
Subordinated Borrowing, Interest Rate     0.00%us-gaap_SubordinatedBorrowingInterestRate
/ us-gaap_LongtermDebtTypeAxis
= zion_ConvertibleSubordinatedNotesCoupnRate5.50Member		    
Convertible Subordinated Debt, Current 64,606,000us-gaap_ConvertibleSubordinatedDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= zion_ConvertibleSubordinatedNotesCoupnRate5.50Member		   64,606,000us-gaap_ConvertibleSubordinatedDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= zion_ConvertibleSubordinatedNotesCoupnRate5.50Member		    
Debt Instrument, Maturity Date Nov. 16, 2015        
Subordinated Notes, Coupon Rate 5.50% [Member] [Member]          
Debt And Shareholders' Equity [Line Items]          
Subordinated Borrowing, Interest Rate     0.00%us-gaap_SubordinatedBorrowingInterestRate
/ us-gaap_LongtermDebtTypeAxis
= zion_SubordinatedNotesCouponRate5.50MemberMember		    
Subordinated Debt, Current 52,744,000us-gaap_SubordinatedDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= zion_SubordinatedNotesCouponRate5.50MemberMember		   52,744,000us-gaap_SubordinatedDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= zion_SubordinatedNotesCouponRate5.50MemberMember		    
Debt Instrument, Maturity Date Nov. 16, 2015        
Senior medium-term notes, optional early redemptions in 2015 [Member]          
Debt And Shareholders' Equity [Line Items]          
Senior medium-term notes with early redemption option 19,228,000zion_SeniorMediumTermNotesWithEarlyRedemptionOption
/ zion_OptionalEarlyRedemptionOnMediumTermNotesAxis
= zion_SeniorMediumTermNotesOptionalEarlyRedemptionsIn2015Member		   19,228,000zion_SeniorMediumTermNotesWithEarlyRedemptionOption
/ zion_OptionalEarlyRedemptionOnMediumTermNotesAxis
= zion_SeniorMediumTermNotesOptionalEarlyRedemptionsIn2015Member		   8,000,000zion_SeniorMediumTermNotesWithEarlyRedemptionOption
/ zion_OptionalEarlyRedemptionOnMediumTermNotesAxis
= zion_SeniorMediumTermNotesOptionalEarlyRedemptionsIn2015Member
Senior medium-term notes, optional early redemptions in 2016 [Member]          
Debt And Shareholders' Equity [Line Items]          
Senior medium-term notes with early redemption option $ 11,106,000zion_SeniorMediumTermNotesWithEarlyRedemptionOption
/ zion_OptionalEarlyRedemptionOnMediumTermNotesAxis
= zion_Seniormediumtermnotesoptionalearlyredemptionsin2016Member		   $ 11,106,000zion_SeniorMediumTermNotesWithEarlyRedemptionOption
/ zion_OptionalEarlyRedemptionOnMediumTermNotesAxis
= zion_Seniormediumtermnotesoptionalearlyredemptionsin2016Member