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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 | Series F Preferred Stock | Series A Preferred Stock | Class C non-voting common stock | Series D Preferred Stock | Series B Preferred Stock | Preferred Stock | Preferred Stock Cumulative Effect, Period of Adoption, Adjusted Balance | Preferred Stock Series E Preferred Stock | Preferred Stock Series F Preferred Stock | Preferred Stock Series A Preferred Stock | Preferred Stock Series D Preferred Stock | Preferred Stock Series B Preferred Stock | 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, 2018 |  |  |  |  |  |  |  |  | 8,400 |  |  |  |  |  |  | 10,669 |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2018 | $ 752,557 |  |  |  |  |  |  |  | $ 204,759 |  |  |  |  |  |  | $ 10,669 |  |  | $ 118,822 |  |  | $ 24,956 |  | $ 393,351 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 25,170 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,170 |  |  |
Other comprehensive income, net of tax | (3,702) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,702) |  |  |  |  |
Cash dividends, preferred stock | (3,296) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,296) |  |  |
Cash dividends, common stock | (7,470) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,470) |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |
Issuance of stock |  |  |  |  |  | $ 23 |  |  |  |  |  |  |  |  |  |  |  | $ 20 |  |  | $ 3 |  |  |  |  |  |
Stock-based compensation cost | 724 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 724 |  |  |  |  |  |  |  |
Other stock-based award activity | (708) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (708) |  |  |  |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2019 |  |  |  |  |  |  |  |  | 8,400 |  |  |  |  |  |  | 10,689 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2019 | 763,298 |  |  |  |  |  |  |  | $ 204,759 |  |  |  |  |  |  | $ 10,689 |  |  | 118,841 |  |  | 21,254 |  | 407,755 |  |  |
Beginning balance ( in shares) at Dec. 31, 2018 |  |  |  |  |  |  |  |  | 8,400 |  |  |  |  |  |  | 10,669 |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2018 | 752,557 |  |  |  |  |  |  |  | $ 204,759 |  |  |  |  |  |  | $ 10,669 |  |  | 118,822 |  |  | 24,956 |  | 393,351 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 77,048 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income, net of tax | (67,980) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on retirement of preferred stock | (1,956) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  |  |  |  |  |  |  |  | 9,400 |  |  |  |  |  |  | 10,710 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | 750,259 |  |  |  |  |  |  |  | $ 228,374 |  |  |  |  |  |  | $ 10,710 |  |  | 118,720 |  |  | (43,024) |  | 435,479 |  |  |
Beginning balance ( in shares) at Mar. 31, 2019 |  |  |  |  |  |  |  |  | 8,400 |  |  |  |  |  |  | 10,689 |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Mar. 31, 2019 | 763,298 |  |  |  |  |  |  |  | $ 204,759 |  |  |  |  |  |  | $ 10,689 |  |  | 118,841 |  |  | 21,254 |  | 407,755 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 34,045 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,045 |  |  |
Other comprehensive income, net of tax | (34,097) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (34,097) |  |  |  |  |
Cash dividends, preferred stock | (3,785) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,785) |  |  |
Cash dividends, common stock | (7,490) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,490) |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000 |  |  |  | 11 |  |  |  |  |  |  |  |  |
Issuance of stock |  |  |  |  |  | 14 | $ 96,659 |  |  |  |  |  |  | $ 96,659 |  |  |  | $ 11 |  |  | 3 |  |  |  |  |  |
Redemption of preferred stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,000) |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock |  |  |  |  |  |  |  | $ (73,044) |  |  |  |  |  |  | $ (73,044) |  |  |  |  |  |  |  |  |  |  |  |
Loss on retirement of preferred stock | (1,956) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,956) |  |  |
Stock-based compensation cost | 533 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 533 |  |  |  |  |  |  |  |
Other stock-based award activity | (435) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (435) |  |  |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2019 |  |  |  |  |  |  |  |  | 9,400 |  |  |  |  |  |  | 10,700 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2019 | 773,742 |  |  |  |  |  |  |  | $ 228,374 |  |  |  |  |  |  | $ 10,700 |  |  | 118,942 |  |  | (12,843) |  | 428,569 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 17,833 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,833 |  |  |
Other comprehensive income, net of tax | (30,181) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (30,181) |  |  |  |  |
Cash dividends, preferred stock | (3,427) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,427) |  |  |
Cash dividends, common stock | (7,496) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,496) |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
Issuance of stock |  |  |  |  |  | 29 |  |  |  |  |  |  |  |  |  |  |  | $ 10 |  |  | 19 |  |  |  |  |  |
Loss on retirement of preferred stock | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation cost | 407 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 407 |  |  |  |  |  |  |  |
Other stock-based award activity | (648) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (648) |  |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  |  |  |  |  |  |  |  | 9,400 |  |  |  |  |  |  | 10,710 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | 750,259 |  |  |  |  |  |  |  | $ 228,374 |  |  |  |  |  |  | $ 10,710 |  |  | 118,720 |  |  | (43,024) |  | 435,479 |  |  |
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 | 12,830 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,830 |  |  |
Other comprehensive 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 stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |  |  |  |  |  |  |
Issuance of 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 | 73,948 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive 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 | 35,626 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,626 |  |  |
Other comprehensive 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 stock (in shares) |  |  |  |  |  |  |  |  |  |  | 3,180 |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
Issuance of stock | 77,003 |  |  |  |  | 27 |  |  |  |  | $ 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 | 25,492 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,492 |  |  |
Other comprehensive 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 stock (in shares) |  |  |  |  |  |  |  |  |  |  |  | 4,800 |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Issuance of stock |  |  |  | $ 116,160 |  | $ 11 |  |  |  |  |  | $ 116,160 |  |  |  |  |  | $ 3 |  |  | $ 8 |  |  |  |  |  |
Redemption of preferred stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | (2,400) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred 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 |  |  |

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