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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands | Total | Preferred Stock | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comp. Income (Loss), net | Accounting Standards Update 2016-13 | Accounting Standards Update 2016-13 Retained Earnings
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 3,965,940 |  | $ 77,484 | $ 3,107,431 | $ 833,130 | $ (52,105) |  |
Balance (in shares) at Dec. 31, 2018 |  |  | 77,484,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Exercise of employee common stock options & related tax benefits | 130 |  | $ 5 | 125 |  |  |  |
Exercise of employee common stock options and related tax benefits (in shares) |  |  | 5,000 |  |  |  |  |
Common dividends paid | (12,545) |  |  |  | (12,545) |  |  |
Repurchase of common stock | (30,049) |  | $ (543) | (29,506) |  |  |  |
Repurchase of common stock (in shares) |  |  | (543,000) |  |  |  |  |
Issuance of restricted common shares, net of forfeitures | 0 |  | $ 180 | (180) |  |  |  |
Issuance of restricted common shares, net of forfeitures (in shares) |  |  | 180,000 |  |  |  |  |
Restricted shares withheld for taxes & related benefits | (3,487) |  | $ (62) | (3,425) |  |  |  |
Restricted shares withheld for taxes (in shares) |  |  | (62,000) |  |  |  |  |
Stock-based compensation expense | 4,913 |  |  | 4,913 |  |  |  |
Net income | 93,960 |  |  |  | 93,960 |  |  |
Other comprehensive income (loss) | 37,077 |  |  |  |  | 37,077 |  |
Balance at Mar. 31, 2019 | 4,055,939 |  | $ 77,064 | 3,079,358 | 914,545 | (15,028) |  |
Balance (in shares) at Mar. 31, 2019 |  |  | 77,064,000 |  |  |  |  |
Balance at Dec. 31, 2018 | 3,965,940 |  | $ 77,484 | 3,107,431 | 833,130 | (52,105) |  |
Balance (in shares) at Dec. 31, 2018 |  |  | 77,484,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock-based compensation expense | 15,091 |  |  |  |  |  |  |
Net income | 304,802 |  |  |  |  |  |  |
Other comprehensive income (loss) | 99,247 |  |  |  |  |  |  |
Balance at Sep. 30, 2019 | 4,294,630 |  | $ 76,736 | 3,070,235 | 1,100,517 | 47,142 |  |
Balance (in shares) at Sep. 30, 2019 |  |  | 76,736,000 |  |  |  |  |
Balance at Mar. 31, 2019 | 4,055,939 |  | $ 77,064 | 3,079,358 | 914,545 | (15,028) |  |
Balance (in shares) at Mar. 31, 2019 |  |  | 77,064,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Exercise of employee common stock options & related tax benefits | 9 |  | $ 1 | 8 |  |  |  |
Exercise of employee common stock options and related tax benefits (in shares) |  |  | 1,000 |  |  |  |  |
Common dividends paid | (12,432) |  |  |  | (12,432) |  |  |
Repurchase of common stock | (7,375) |  | $ (132) | (7,243) |  |  |  |
Repurchase of common stock (in shares) |  |  | (132,000) |  |  |  |  |
Issuance of restricted common shares, net of forfeitures | 0 |  | $ 10 | (10) |  |  |  |
Issuance of restricted common shares, net of forfeitures (in shares) |  |  | 10,000 |  |  |  |  |
Restricted shares withheld for taxes & related benefits | (801) |  | $ (14) | (787) |  |  |  |
Restricted shares withheld for taxes (in shares) |  |  | (14,000) |  |  |  |  |
Stock-based compensation expense | 5,160 |  |  | 5,160 |  |  |  |
Net income | 100,321 |  |  |  | 100,321 |  |  |
Other comprehensive income (loss) | 35,540 |  |  |  |  | 35,540 |  |
Balance at Jun. 30, 2019 | $ 4,176,361 |  | $ 76,929 | 3,076,486 | 1,002,434 | 20,512 |  |
Balance (in shares) at Jun. 30, 2019 |  |  | 76,929,000 |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.16 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Exercise of employee common stock options & related tax benefits | $ 108 |  | $ 4 | 104 |  |  |  |
Exercise of employee common stock options and related tax benefits (in shares) |  |  | 4,000 |  |  |  |  |
Common dividends paid | (12,438) |  |  |  | (12,438) |  |  |
Repurchase of common stock | (11,065) |  | $ (198) | (10,867) |  |  |  |
Repurchase of common stock (in shares) |  |  | (198,000) |  |  |  |  |
Issuance of restricted common shares, net of forfeitures | 0 |  | $ 10 | (10) |  |  |  |
Issuance of restricted common shares, net of forfeitures (in shares) |  |  | 10,000 |  |  |  |  |
Restricted shares withheld for taxes & related benefits | (505) |  | $ (9) | (496) |  |  |  |
Restricted shares withheld for taxes (in shares) |  |  | (9,000) |  |  |  |  |
Stock-based compensation expense | 5,018 |  |  | 5,018 |  |  |  |
Net income | 110,521 |  |  |  | 110,521 |  |  |
Other comprehensive income (loss) | 26,630 |  |  |  |  | 26,630 |  |
Balance at Sep. 30, 2019 | 4,294,630 |  | $ 76,736 | 3,070,235 | 1,100,517 | 47,142 |  |
Balance (in shares) at Sep. 30, 2019 |  |  | 76,736,000 |  |  |  |  |
Balance at Dec. 31, 2019 | 4,355,748 |  | $ 76,564 | 3,064,467 | 1,184,183 | 30,534 |  |
Balance (in shares) at Dec. 31, 2019 |  |  | 76,564,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Exercise of employee common stock options & related tax benefits | 5 |  | $ 1 | 4 |  |  |  |
Exercise of employee common stock options and related tax benefits (in shares) |  |  | 1,000 |  |  |  |  |
Common dividends paid | (12,442) |  |  |  | (12,442) |  |  |
Repurchase of common stock | (50,790) |  | $ (1,015) | (49,775) |  |  |  |
Repurchase of common stock (in shares) |  |  | (1,015,000) |  |  |  |  |
Issuance of restricted common shares, net of forfeitures | 0 |  | $ 198 | (198) |  |  |  |
Issuance of restricted common shares, net of forfeitures (in shares) |  |  | 198,000 |  |  |  |  |
Restricted shares withheld for taxes & related benefits | (1,957) |  | $ (32) | (1,925) |  |  |  |
Restricted shares withheld for taxes (in shares) |  |  | (32,000) |  |  |  |  |
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes & related tax benefits | 2,469 |  | $ 84 | (2,553) |  |  |  |
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes and related tax benefit (in shares) |  |  | 84,000 |  |  |  |  |
Stock-based compensation expense | 5,501 |  |  | 5,501 |  |  |  |
Net income | 28,356 |  |  |  | 28,356 |  |  |
Cumulative effect of change in accounting principle |  |  |  |  |  |  | $ (31,796) | $ (31,796)
Other comprehensive income (loss) | 94,972 |  |  |  |  | 94,972 |  |
Balance at Mar. 31, 2020 | 4,385,128 |  | $ 75,800 | 3,015,521 | 1,168,301 | 125,506 |  |
Balance (in shares) at Mar. 31, 2020 |  |  | 75,800,000 |  |  |  |  |
Balance at Dec. 31, 2019 | 4,355,748 |  | $ 76,564 | 3,064,467 | 1,184,183 | 30,534 |  |
Balance (in shares) at Dec. 31, 2019 |  |  | 76,564,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock-based compensation expense | 14,092 |  |  |  |  |  |  |
Net income | 201,445 |  |  |  |  |  |  |
Other comprehensive income (loss) | 127,454 |  |  |  |  |  |  |
Balance at Sep. 30, 2020 | 4,787,308 | $ 217,126 | $ 75,835 | 3,023,430 | 1,312,929 | 157,988 |  |
Balance (in shares) at Sep. 30, 2020 |  |  | 75,835,000 |  |  |  |  |
Balance at Mar. 31, 2020 | 4,385,128 |  | $ 75,800 | 3,015,521 | 1,168,301 | 125,506 |  |
Balance (in shares) at Mar. 31, 2020 |  |  | 75,800,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuance of preferred stock, net of issuance costs | 217,632 | 217,632 |  |  |  |  |  |
Exercise of employee common stock options & related tax benefits | 225 |  | $ 9 | 216 |  |  |  |
Exercise of employee common stock options and related tax benefits (in shares) |  |  | 9,000 |  |  |  |  |
Common dividends paid | (12,378) |  |  |  | (12,378) |  |  |
Issuance of restricted common shares, net of forfeitures | 0 |  | $ 38 | (38) |  |  |  |
Issuance of restricted common shares, net of forfeitures (in shares) |  |  | 38,000 |  |  |  |  |
Restricted shares withheld for taxes & related benefits | (553) |  | $ (13) | (540) |  |  |  |
Restricted shares withheld for taxes (in shares) |  |  | (13,000) |  |  |  |  |
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes & related tax benefits | 19 |  | $ 2 | (21) |  |  |  |
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes and related tax benefit (in shares) |  |  | 2,000 |  |  |  |  |
Stock-based compensation expense | 4,148 |  |  | 4,148 |  |  |  |
Net income | 62,444 |  |  |  | 62,444 |  |  |
Other comprehensive income (loss) | 39,020 |  |  |  |  | 39,020 |  |
Balance at Jun. 30, 2020 | $ 4,695,647 | 217,632 | $ 75,836 | 3,019,286 | 1,218,367 | 164,526 |  |
Balance (in shares) at Jun. 30, 2020 |  |  | 75,836,000 |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.16 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuance of preferred stock, net of issuance costs | $ (506) | (506) |  |  |  |  |  |
Preferred dividends paid | 3,798 |  |  |  | 3,798 |  |  |
Common dividends paid | (12,285) |  |  |  | (12,285) |  |  |
Issuance of restricted common shares, net of forfeitures | 0 |  | $ 6 | (6) |  |  |  |
Issuance of restricted common shares, net of forfeitures (in shares) |  |  | 6,000 |  |  |  |  |
Restricted shares withheld for taxes & related benefits | (300) |  | $ (7) | (293) |  |  |  |
Restricted shares withheld for taxes (in shares) |  |  | (7,000) |  |  |  |  |
Stock-based compensation expense | 4,443 |  |  | 4,443 |  |  |  |
Net income | 110,645 |  |  |  | 110,645 |  |  |
Other comprehensive income (loss) | (6,538) |  |  |  |  | (6,538) |  |
Balance at Sep. 30, 2020 | $ 4,787,308 | $ 217,126 | $ 75,835 | $ 3,023,430 | $ 1,312,929 | $ 157,988 |  |
Balance (in shares) at Sep. 30, 2020 |  |  | 75,835,000 |  |  |  |  |

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