Common Stock, $1.00 Par Value Common Stock [Member] Entity Tax Identification Number Entity Tax Identification Number Entity File Number Entity File Number Cover [Abstract] Cover [Abstract] Title of 12(b) Security Title of 12(b) Security Entities [Table] Entities [Table] Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series B Series B Preferred Stock [Member] Soliciting Material Soliciting Material Entity Address, Address Line One Entity Address, Address Line One Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Entity Address, State or Province Entity Address, State or Province Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Depositary Shares, each representing 1/40 interest in a Share of 6.75% Fixed-Rate Non-Cumulative Perpetual Preferred Stock Series C Series C Preferred Stock [Member] Written Communications Written Communications Entity Information [Line Items] Entity Information [Line Items] Trading Symbol Trading Symbol City Area Code City Area Code Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series A Series A Preferred Stock [Member] Document Period End Date Document Period End Date Amendment Flag Amendment Flag Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Entity Address, City or Town Entity Address, City or Town Security Exchange Name Security Exchange Name Document Type Document Type Class of Stock [Axis] Class of Stock [Axis] Pre-commencement Tender Offer Pre-commencement Tender Offer Central Index Key Entity Central Index Key Entity Emerging Growth Company Entity Emerging Growth Company