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Shareholders' Equity - Preferred Stock and Dividends Paid Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Capital Unit [Line Items] |  |  |
Preferred stock, shares issued | 9,000,000 | 9,000,000 |
Preferred stock, carrying value | $ 217,471 | $ 217,471 |
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series C, par value $1.00 per share |  |  |
Capital Unit [Line Items] |  |  |
Preferred stock, shares issued | 2,300,000 | 2,300,000 |
Preferred stock, carrying value | $ 55,569 | $ 55,569 |
Preferred stock, fixed dividend rate | 7.00% |  |
Preferred stock, dividends paid (usd per share) | $ 1.75 | $ 1.75 | $ 1.75
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series C, par value $1.00 per share | London Interbank Offered Rate (LIBOR) |  |  |
Capital Unit [Line Items] |  |  |
Preferred stock, floating dividend rate | 5.30% |  |
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, par value $1.00 per share |  |  |
Capital Unit [Line Items] |  |  |
Preferred stock, shares issued | 1,000,000 | 1,000,000 |
Preferred stock, carrying value | $ 24,108 | $ 24,108 |
Preferred stock, fixed dividend rate | 6.50% |  |
Preferred stock, dividends paid (usd per share) | $ 1.63 | $ 1.63 | 1.63
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, par value $1.00 per share | London Interbank Offered Rate (LIBOR) |  |  |
Capital Unit [Line Items] |  |  |
Preferred stock, floating dividend rate | 5.09% |  |
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series E, par value $1.00 per share |  |  |
Capital Unit [Line Items] |  |  |
Preferred stock, shares issued | 2,300,000 | 2,300,000 |
Preferred stock, carrying value | $ 55,593 | $ 55,593 |
Preferred stock, fixed dividend rate | 6.45% |  |
Preferred stock, dividends paid (usd per share) | $ 1.61 | $ 1.61 | 1.61
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series E, par value $1.00 per share | London Interbank Offered Rate (LIBOR) |  |  |
Capital Unit [Line Items] |  |  |
Preferred stock, floating dividend rate | 5.14% |  |
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series F, par value $1.00 per share |  |  |
Capital Unit [Line Items] |  |  |
Preferred stock, shares issued | 3,400,000 | 3,400,000 |
Preferred stock, carrying value | $ 82,201 | $ 82,201 |
Preferred stock, fixed dividend rate | 6.00% |  |
Preferred stock, dividends paid (usd per share) | $ 1.50 | $ 1.50 | $ 1.50
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series F, par value $1.00 per share | London Interbank Offered Rate (LIBOR) |  |  |
Capital Unit [Line Items] |  |  |
Preferred stock, floating dividend rate | 4.762% |  |

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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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