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Equity - Narrative (Details) - USD ($) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 19, 2020 | Aug. 20, 2020 | May 20, 2020 | May 13, 2019 | Jun. 20, 2014 | May 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 14, 2019 | Dec. 31, 2017 | Sep. 30, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly dividend on all classes of common stock (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.80 | $ 0.70 | $ 0.58 |  |  |
Deferred issuance costs |  |  |  |  |  |  |  | $ 1,956,000 | $ 1,667,000 | $ 1,956,000 | $ 0 |  |  |
Share expiration period |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
SARs exercise price (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 82.76 | $ 86.15 |  |  |
Excess tax benefits related to stock-based awards |  |  |  |  |  |  |  |  | $ (440,000) | $ 449,000 | $ 946,000 |  |  |
Decrease in additional paid-in capital |  |  |  |  |  |  |  |  | $ (600,000) | (1,800,000) | (2,700,000) |  |  |
Stock options outstanding |  |  |  |  |  |  |  |  | 116,417 |  |  |  |  |
Intrinsic value of outstanding, exercisable and vested or excepted to vest restricted stock |  |  |  |  |  |  |  | 8,900,000 | $ 8,500,000 | 8,900,000 |  |  |  |
Intrinsic value of shares exercised |  |  |  |  |  |  |  |  | 700,000 | $ 1,900,000 | $ 3,000,000.0 |  |  |
Unrecognized compensation cost |  |  |  |  |  |  |  |  | $ 2,400,000 |  |  |  |  |
Weighted-average period of recognition |  |  |  |  |  |  |  |  | 1 year 9 months 18 days |  |  |  |  |
Weighted-average grant date fair value (in dollars per share) |  |  |  |  |  |  |  |  | $ 45.91 | $ 58.27 | $ 69.38 |  |  |
Compensation expense |  |  |  |  |  |  |  |  | $ 4,100,000 | $ 2,300,000 | $ 2,500,000 |  |  |
Weighted-average grant date fair value of the restricted stock awarded (in dollars per share) |  |  |  |  |  |  |  |  | $ 66.02 | $ 80.51 | $ 84.03 |  |  |
Capital required for capital adequacy |  |  |  |  |  |  |  | 618,800,000 | $ 680,900,000 | $ 618,800,000 |  |  |  |
Capital |  |  |  |  |  |  |  | 815,400,000 | 1,000,000,000.0 | 815,400,000 |  |  |  |
Excess capital |  |  |  |  |  |  |  | $ 196,600,000 | $ 325,500,000 | $ 196,600,000 |  |  |  |
5.250% Non-Cumulative Preferred Stock, Series F |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  | 4,800,000 |  |  |  |  |  | 4,800,000 | 4,800,000 | 4,800,000 |  |  |  |
Preferred stock, dividend rate |  | 5.25% |  |  |  |  |  |  |  |  |  |  |  |
Liquidation value (in dollars per share) |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  | $ 120,000,000.0 |  |  |  |  |  | $ 0 | $ 116,160,000 | $ 0 |  |  |  |
Payments of stock issuance costs |  | $ 3,800,000 |  |  |  |  |  |  | $ 3,839,902 |  |  |  |  |
Series A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock authorized for repurchase | $ 60,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  |  |  | 2,400,000 | 2,400,000 | 2,400,000 |  |  |  |
Preferred stock, dividend rate | 5.875% |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |  | $ 58,333,000 | $ 0 | $ 58,333,000 |  |  |  |
Deferred issuance costs | $ 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series E |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  | 3,180,000 |  |  | 3,180,000 |  | 3,180,000 | 3,180,000 | 3,180,000 |  |  |  |
Preferred stock, dividend rate |  |  | 5.75% |  |  | 5.75% |  |  |  |  |  |  |  |
Liquidation value (in dollars per share) |  |  | $ 25.00 |  |  | $ 25.00 |  |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  | $ 79,500,000 |  | $ 0 | $ 77,003,000 | $ 0 |  |  |  |
Payments of stock issuance costs |  |  | $ 2,496,750 |  |  | $ 2,500,000 |  |  |  |  |  |  |  |
Class C non-voting common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock authorized for repurchase |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000.0 |  | $ 25,000,000.0
Shares repurchased (in shares) |  |  |  |  |  |  | 4,000 |  | 673,000 |  |  |  |  |
Shares repurchased |  |  |  |  |  |  | $ 200,000 |  | $ 19,800,000 |  |  |  |  |
6.000% Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series C |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  | 3,000,000 |  |  | 3,000,000 | 3,000,000 | 3,000,000 |  |  |  |
Preferred stock, dividend rate |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |
Liquidation value (in dollars per share) |  |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |  | $ 73,382,000 | $ 73,382,000 | $ 73,382,000 |  |  |  |
Payments of stock issuance costs |  |  |  |  | $ 1,618,583 |  |  |  |  |  |  |  |  |
5.700% Non-Cumulative Preferred Stock, Series D |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 4,000,000 |  |  |  | 4,000,000 | 4,000,000 | 4,000,000 |  |  |  |
Preferred stock, dividend rate |  |  |  | 5.70% |  |  |  |  |  |  |  |  |  |
Liquidation value (in dollars per share) |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |  | $ 96,659,000 | $ 96,659,000 | $ 96,659,000 |  |  |  |
Payments of stock issuance costs |  |  |  | $ 3,340,456 |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
SARs exercise price (in dollars per share) |  |  |  |  |  |  |  |  | $ 72.26 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
SARs exercise price (in dollars per share) |  |  |  |  |  |  |  |  | $ 75.16 |  |  |  |  |
Stock option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options outstanding |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Restricted Stock | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Restricted Stock | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
SARs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit from exercise of SARs |  |  |  |  |  |  |  |  | $ 500,000 | 1,000,000.0 | $ 1,500,000 |  |  |
Excess tax benefits related to stock-based awards |  |  |  |  |  |  |  |  | $ 8,900 | $ 400,000 |  |  |  |
Stock options outstanding |  |  |  |  |  |  |  | 98,836 | 116,417 | 98,836 | 124,960 |  | 163,272 |

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