Entity Listings [Line Items] Entity Listings [Line Items] Document Type Document Type Entity Listings [Table] Entity Listings [Table] City Area Code City Area Code Amendment Flag Amendment Flag Entity Address, State or Province Entity Address, State or Province Depositary Shares, each representing a 1/1,000th interest in a share of 6.600% Non-Cumulative Preferred Stock, Series A Series A Preferred Stock [Member] Soliciting Material Soliciting Material Document Period End Date Document Period End Date Entity Tax Identification Number Entity Tax Identification Number Common Stock, par value $0.01 per share Common Stock [Member] Pre-commencement Tender Offer Pre-commencement Tender Offer Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Class of Stock [Domain] Class of Stock [Domain] Class of Stock [Axis] Class of Stock [Axis] Entity File Number Entity File Number Entity Central Index Key Entity Central Index Key 6.250% Junior Subordinated Debentures due 2058 Junior Subordinated Debt [Member] Trading Symbol Trading Symbol Depositary Shares, each representing a 1/1,000th interest in a share of 6.750% Non-Cumulative Preferred Stock, Series B Series B Preferred Stock [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Local Phone Number Local Phone Number Written Communications Written Communications Title of 12(b) Security Title of 12(b) Security Security Exchange Name Security Exchange Name Entity Address, City or Town Entity Address, City or Town Cover [Abstract] Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Entity Address, Address Line One Entity Address, Address Line One Entity Emerging Growth Company Entity Emerging Growth Company Entity Registrant Name Entity Registrant Name Depositary Shares, each representing a 1/1,000th interest in a share of 5.375% Non-Cumulative Preferred Stock, Series C Series C Preferred Stock [Member]