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CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjusted Balance | Class C non-voting common stock | Series G | Series E | 5.250% Non-Cumulative Preferred Stock, Series F | Series A | Preferred Stock | Preferred Stock Cumulative Effect, Period of Adoption, Adjusted Balance | Preferred Stock Series G | Preferred Stock Series E | Preferred Stock 5.250% Non-Cumulative Preferred Stock, Series F | Preferred Stock Series A | Common Stock | Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance | Common Stock Class C non-voting common stock | Additional Paid-in Capital | Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance | Additional Paid-in Capital Class C non-voting common stock | Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance | Retained Earnings Class C non-voting common stock
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Beginning balance ( in shares) at Dec. 31, 2019 |  |  |  |  |  |  |  |  | 9,400 | 9,400 |  |  |  |  | 10,712 | 10,712 |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | $ 799,276 | $ (2,099) | $ 797,177 |  |  |  |  |  | $ 228,374 | $ 228,374 |  |  |  |  | $ 10,712 | $ 10,712 |  | $ 119,304 | $ 119,304 |  | $ (16,161) | $ (16,161) | $ 457,047 | $ (2,099) | $ 454,948 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 12,830 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,830 |  |  |
Other comprehensive (loss)/income net of tax | (105,276) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (105,276) |  |  |  |  |
Cash dividends, preferred stock | (3,431) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,431) |  |  |
Cash dividends, common stock | (8,571) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,571) |  |  |
Issuance of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  | $ 34 |  |  |  |  |  |  |  |  |  |  |  |  | $ 15 |  |  | $ 19 |  |  |  |  |  |
Repurchase of Class C Common Stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4) |  |  |  |  |  |  |  |  |
Repurchase of Class C Common Stock | (235) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (4) |  |  |  |  |  |  |  |  | $ (231)
Stock-based compensation cost | 1,293 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,293 |  |  |  |  |  |  |  |
Other stock-based award activity | (204) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (204) |  |  |  |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2020 |  |  |  |  |  |  |  |  | 9,400 |  |  |  |  |  | 10,723 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2020 | 693,617 |  |  |  |  |  |  |  | $ 228,374 |  |  |  |  |  | $ 10,723 |  |  | 120,412 |  |  | (121,437) |  | 455,545 |  |  |
Beginning balance ( in shares) at Dec. 31, 2019 |  |  |  |  |  |  |  |  | 9,400 | 9,400 |  |  |  |  | 10,712 | 10,712 |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | 799,276 | $ (2,099) | $ 797,177 |  |  |  |  |  | $ 228,374 | $ 228,374 |  |  |  |  | $ 10,712 | $ 10,712 |  | 119,304 | $ 119,304 |  | (16,161) | $ (16,161) | 457,047 | $ (2,099) | $ 454,948 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 73,948 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive (loss)/income net of tax | (37,676) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on retirement of preferred stock | (1,667) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  |  |  |  |  |  |  |  | 14,980 |  |  |  |  |  | 10,736 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2020 | 930,345 |  |  |  |  |  |  |  | $ 363,204 |  |  |  |  |  | $ 10,736 |  |  | 121,525 |  |  | (53,837) |  | 488,717 |  |  |
Beginning balance ( in shares) at Mar. 31, 2020 |  |  |  |  |  |  |  |  | 9,400 |  |  |  |  |  | 10,723 |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2020 | 693,617 |  |  |  |  |  |  |  | $ 228,374 |  |  |  |  |  | $ 10,723 |  |  | 120,412 |  |  | (121,437) |  | 455,545 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 35,626 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,626 |  |  |
Other comprehensive (loss)/income net of tax | 29,940 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,940 |  |  |  |  |
Cash dividends, preferred stock | (3,939) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,939) |  |  |
Cash dividends, common stock | (8,585) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,585) |  |  |
Issuance of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  | 3,180 |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  | 27 |  | $ 77,003 |  |  |  |  |  | $ 77,003 |  |  |  |  | $ 10 |  |  | 17 |  |  |  |  |  |
Stock-based compensation cost | 719 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 719 |  |  |  |  |  |  |  |
Other stock-based award activity | (292) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (292) |  |  |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2020 |  |  |  |  |  |  |  |  | 12,580 |  |  |  |  |  | 10,733 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2020 | 824,116 |  |  |  |  |  |  |  | $ 305,377 |  |  |  |  |  | $ 10,733 |  |  | 120,856 |  |  | (91,497) |  | 478,647 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 25,492 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,492 |  |  |
Other comprehensive (loss)/income net of tax | 37,660 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,660 |  |  |  |  |
Cash dividends, preferred stock | (5,166) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,166) |  |  |
Cash dividends, common stock | (8,589) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,589) |  |  |
Issuance of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 4,800 |  |  |  | 3 |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  | 11 |  |  | $ 116,160 |  |  |  |  |  | $ 116,160 |  |  |  | $ 3 |  |  | 8 |  |  |  |  |  |
Redemption of stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,400) |  |  |  |  |  |  |  |  |  |  |  |
Redemption of stock |  |  |  |  |  |  |  | $ (58,333) |  |  |  |  |  | $ (58,333) |  |  |  |  |  |  |  |  |  |  |  |
Loss on retirement of preferred stock | (1,667) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,667) |  |  |
Stock-based compensation cost | 753 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 753 |  |  |  |  |  |  |  |
Other stock-based award activity | (92) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (92) |  |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  |  |  |  |  |  |  |  | 14,980 |  |  |  |  |  | 10,736 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2020 | 930,345 |  |  |  |  |  |  |  | $ 363,204 |  |  |  |  |  | $ 10,736 |  |  | 121,525 |  |  | (53,837) |  | 488,717 |  |  |
Beginning balance ( in shares) at Dec. 31, 2020 |  |  |  |  |  |  |  |  | 14,980 |  |  |  |  |  | 10,737 |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2020 | 992,477 |  |  |  |  |  |  |  | $ 363,204 |  |  |  |  |  | $ 10,737 |  |  | 122,899 |  |  | (13,923) |  | 509,560 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 33,227 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,227 |  |  |
Other comprehensive (loss)/income net of tax | 65,667 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,667 |  |  |  |  |
Cash dividends, preferred stock | (5,269) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,269) |  |  |
Cash dividends, common stock | (9,450) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,450) |  |  |
Issuance of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21 |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  | 33 |  |  |  |  |  |  |  |  |  |  |  |  | $ 21 |  |  | 12 |  |  |  |  |  |
Stock-based compensation cost | 1,665 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,665 |  |  |  |  |  |  |  |
Other stock-based award activity | (858) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (858) |  |  |  |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2021 |  |  |  |  |  |  |  |  | 14,980 |  |  |  |  |  | 10,758 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2021 | 1,077,492 |  |  |  |  |  |  |  | $ 363,204 |  |  |  |  |  | $ 10,758 |  |  | 123,718 |  |  | 51,744 |  | 528,068 |  |  |
Beginning balance ( in shares) at Dec. 31, 2020 |  |  |  |  |  |  |  |  | 14,980 |  |  |  |  |  | 10,737 |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2020 | 992,477 |  |  |  |  |  |  |  | $ 363,204 |  |  |  |  |  | $ 10,737 |  |  | 122,899 |  |  | (13,923) |  | 509,560 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 95,576 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive (loss)/income net of tax | 32,129 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on retirement of preferred stock | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2021 |  |  |  |  |  |  |  |  | 19,980 |  |  |  |  |  | 10,766 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2021 | 1,197,298 |  |  |  |  |  |  |  | $ 484,531 |  |  |  |  |  | $ 10,766 |  |  | 124,942 |  |  | 18,206 |  | 558,853 |  |  |
Beginning balance ( in shares) at Mar. 31, 2021 |  |  |  |  |  |  |  |  | 14,980 |  |  |  |  |  | 10,758 |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2021 | 1,077,492 |  |  |  |  |  |  |  | $ 363,204 |  |  |  |  |  | $ 10,758 |  |  | 123,718 |  |  | 51,744 |  | 528,068 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 31,286 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,286 |  |  |
Other comprehensive (loss)/income net of tax | (35,011) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (35,011) |  |  |  |  |
Cash dividends, preferred stock | (5,842) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,842) |  |  |
Cash dividends, common stock | (9,474) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,474) |  |  |
Issuance of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 5,000 |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  | 20 | $ 121,327 |  |  |  |  |  | $ 121,327 |  |  |  |  |  | $ 7 |  |  | 13 |  |  |  |  |  |
Stock-based compensation cost | 891 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 891 |  |  |  |  |  |  |  |
Other stock-based award activity | (474) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (474) |  |  |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2021 |  |  |  |  |  |  |  |  | 19,980 |  |  |  |  |  | 10,765 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2021 | 1,180,215 |  |  |  |  |  |  |  | $ 484,531 |  |  |  |  |  | $ 10,765 |  |  | 124,148 |  |  | 16,733 |  | 544,038 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 31,063 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,063 |  |  |
Other comprehensive (loss)/income net of tax | 1,473 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,473 |  |  |  |  |
Cash dividends, preferred stock | (6,774) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,774) |  |  |
Cash dividends, common stock | (9,474) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,474) |  |  |
Issuance of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  | $ 46 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 |  |  | $ 45 |  |  |  |  |  |
Loss on retirement of preferred stock | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation cost | 749 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 749 |  |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2021 |  |  |  |  |  |  |  |  | 19,980 |  |  |  |  |  | 10,766 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2021 | $ 1,197,298 |  |  |  |  |  |  |  | $ 484,531 |  |  |  |  |  | $ 10,766 |  |  | $ 124,942 |  |  | $ 18,206 |  | $ 558,853 |  |  |

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