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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Cumulative Effect, Period Of Adoption, Adjustment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Treasury Shares [Member] | Treasury Shares [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Common Stock [Member] | Preferred Shares Issued [Member] | Additional Paid-In Capital [Member] | Additional Paid-In Capital [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Retained Earnings [Member] | Retained Earnings [Member] Cumulative Effect, Period Of Adoption, Adjustment [Member] | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect, Period Of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
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Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of changes in accounting principle (ASU 2016-13) | $ 501,633 |  |  | $ (130,399) |  |  | $ 465 |  | $ 86,353 |  | $ 553,224 |  |  | $ (8,010) |  |
Beginning balance at Dec. 31, 2018 | 501,633 |  |  | $ (130,399) |  |  | $ 465 |  | 86,353 |  | 553,224 |  |  | (8,010) |  |
Beginning balance (in shares) at Dec. 31, 2018 |  |  |  | 11,731 |  |  | 46,514 | 10 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of changes in accounting principle (ASU 2016-13) | 539,050 |  |  | $ (140,516) |  |  | $ 467 |  | 87,328 |  | 587,797 |  |  | 3,974 |  |
Vesting of performance share units | (2,069) |  |  | $ (2,069) |  |  | $ 2 |  | (2) |  |  |  |  |  |  |
Vesting of performance share units (in shares) |  |  |  | 56 | [1] |  | 148 |  |  |  |  |  |  |  |  |
Grants and vesting of restricted stock | (166) |  |  | $ (166) |  |  |  |  |  |  |  |  |  |  |  |
Grants and vesting of restricted stock (in shares) |  |  |  | 5 | [1] |  | 25 |  |  |  |  |  |  |  |  |
Stock option exercises | 72 |  |  | $ (1,367) |  |  | $ 1 |  | 1,438 |  |  |  |  |  |  |
Stock option exercises (in shares) |  |  |  | 36 | [1] |  | 84 |  |  |  |  |  |  |  |  |
Retirement of treasury shares | 0 |  |  | $ 3,602 |  |  | $ (1) |  | (3,601) |  |  |  |  |  |  |
Retirement of treasury shares, shares (in shares) |  |  |  | (97) | [1] |  | (97) |  |  |  |  |  |  |  |  |
Purchases of treasury stock | (10,117) |  |  | $ (10,117) |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock (in shares) |  |  |  | (321) |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 3,140 |  |  |  |  |  |  |  | 3,140 |  |  |  |  |  |  |
Net income | 40,148 |  |  |  |  |  |  |  |  |  | 40,148 |  |  |  |  |
Other comprehensive income (loss), net of taxes | 11,984 |  |  |  |  |  |  |  |  |  |  |  |  | 11,984 |  |
Declaration of dividends | (5,575) |  |  |  |  |  |  |  |  |  | (5,575) |  |  |  |  |
Ending balance at Mar. 31, 2019 | 539,050 |  |  | $ (140,516) |  |  | $ 467 |  | 87,328 |  | 587,797 |  |  | 3,974 |  |
Ending balance (in shares) at Mar. 31, 2019 |  |  |  | 12,052 |  |  | 46,674 | 10 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | 501,633 |  |  | $ (130,399) |  |  | $ 465 |  | 86,353 |  | 553,224 |  |  | (8,010) |  |
Beginning balance (in shares) at Dec. 31, 2018 |  |  |  | 11,731 |  |  | 46,514 | 10 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of changes in accounting principle (ASU 2016-13) | 566,066 |  |  | $ (154,623) |  |  | $ 467 |  | 90,226 |  | 614,067 |  |  | 15,929 |  |
Net income | 77,441 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of taxes | 23,939 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2019 | 566,066 |  |  | $ (154,623) |  |  | $ 467 |  | 90,226 |  | 614,067 |  |  | 15,929 |  |
Ending balance (in shares) at Jun. 30, 2019 |  |  |  | 12,538 |  |  | 46,698 | 10 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | 501,633 |  |  | $ (130,399) |  |  | $ 465 |  | 86,353 |  | 553,224 |  |  | (8,010) |  |
Beginning balance (in shares) at Dec. 31, 2018 |  |  |  | 11,731 |  |  | 46,514 | 10 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of changes in accounting principle (ASU 2016-13) | 501,633 | $ 0 | $ 493,901 | $ (130,399) |  | $ (196,585) | $ 465 |  | 86,353 | $ 96,036 | 553,224 | $ (597) | $ 573,022 | (8,010) | $ 597 | $ 20,961
Ending balance at Dec. 31, 2019 | $ 493,901 | 0 | 493,901 | $ (196,585) |  | (196,585) | $ 467 |  | 96,036 | 96,036 | 573,619 | (597) | 573,022 | 20,364 | 597 | 20,961
Ending balance (in shares) at Dec. 31, 2019 |  |  |  | 14,069 |  |  | 46,707 | 10 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of changes in accounting principle (ASU 2016-13) | $ 539,050 |  |  | $ (140,516) |  |  | $ 467 |  | 87,328 |  | 587,797 |  |  | 3,974 |  |
Beginning balance at Mar. 31, 2019 | 539,050 |  |  | $ (140,516) |  |  | $ 467 |  | 87,328 |  | 587,797 |  |  | 3,974 |  |
Beginning balance (in shares) at Mar. 31, 2019 |  |  |  | 12,052 |  |  | 46,674 | 10 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of changes in accounting principle (ASU 2016-13) | 566,066 |  |  | $ (154,623) |  |  | $ 467 |  | 90,226 |  | 614,067 |  |  | 15,929 |  |
Grants and vesting of restricted stock | (402) |  |  | $ (402) |  |  |  |  |  |  |  |  |  |  |  |
Grants and vesting of restricted stock (in shares) |  |  |  | 14 | [1] |  | 25 |  |  |  |  |  |  |  |  |
Stock option exercises | (11) |  |  | $ (414) |  |  |  |  | 403 |  |  |  |  |  |  |
Stock option exercises (in shares) |  |  |  | 14 | [1] |  | 27 |  |  |  |  |  |  |  |  |
Retirement of treasury shares | 0 |  |  | $ 816 |  |  |  |  | (816) |  |  |  |  |  |  |
Retirement of treasury shares, shares (in shares) |  |  |  | (28) | [1] |  | (28) |  |  |  |  |  |  |  |  |
Purchases of treasury stock | (14,107) |  |  | $ (14,107) |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock (in shares) |  |  |  | (486) |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 3,311 |  |  |  |  |  |  |  | 3,311 |  |  |  |  |  |  |
Net income | 37,293 |  |  |  |  |  |  |  |  |  | 37,293 |  |  |  |  |
Other comprehensive income (loss), net of taxes | 11,955 |  |  |  |  |  |  |  |  |  |  |  |  | 11,955 |  |
Declaration of dividends | (5,547) |  |  |  |  |  |  |  |  |  | (5,547) |  |  |  |  |
Declaration of third quarter dividends | (5,476) |  |  |  |  |  |  |  |  |  | (5,476) |  |  |  |  |
Ending balance at Jun. 30, 2019 | 566,066 |  |  | $ (154,623) |  |  | $ 467 |  | 90,226 |  | 614,067 |  |  | 15,929 |  |
Ending balance (in shares) at Jun. 30, 2019 |  |  |  | 12,538 |  |  | 46,698 | 10 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of changes in accounting principle (ASU 2016-13) | 566,066 |  |  | $ (154,623) |  |  | $ 467 |  | 90,226 |  | 614,067 |  |  | 15,929 |  |
Cumulative effect of changes in accounting principle (ASU 2016-13) | 493,901 | 0 | 493,901 | (196,585) |  | (196,585) | 467 |  | 96,036 | 96,036 | 573,619 | (597) | 573,022 | 20,364 | 597 | 20,961
Beginning balance at Dec. 31, 2019 | 493,901 | 0 | 493,901 | $ (196,585) |  | (196,585) | $ 467 |  | 96,036 | 96,036 | 573,619 | (597) | 573,022 | 20,364 | 597 | 20,961
Beginning balance (in shares) at Dec. 31, 2019 |  |  |  | 14,069 |  |  | 46,707 | 10 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of changes in accounting principle (ASU 2016-13) | 494,288 | 0 | 493,901 | $ (203,172) |  | (196,585) | $ 468 |  | 97,110 | 96,036 | 587,867 | (597) | 573,022 | 12,015 | 597 | 20,961
Vesting of performance share units | (646) |  |  | $ (646) |  |  | $ 1 |  | (1) |  |  |  |  |  |  |
Vesting of performance share units (in shares) |  |  |  | 25 | [1] |  | 83 |  |  |  |  |  |  |  |  |
Grant and issue of stock award | 30 |  |  |  |  |  |  |  | 30 |  |  |  |  |  |  |
Grant and issue of stock award (in shares) |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Retirement of treasury shares | 0 |  |  | $ 646 |  |  |  |  | (646) |  |  |  |  |  |  |
Retirement of treasury shares, shares (in shares) |  |  |  | (25) | [1] |  | (25) |  |  |  |  |  |  |  |  |
Purchases of treasury stock | (6,587) |  |  | $ (6,587) |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock (in shares) |  |  |  | (312) |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 1,691 |  |  |  |  |  |  |  | 1,691 |  |  |  |  |  |  |
Net income | 20,067 |  |  |  |  |  |  |  |  |  | 20,067 |  |  |  |  |
Other comprehensive income (loss), net of taxes | (8,946) |  |  |  |  |  |  |  |  |  |  |  |  | (8,946) |  |
Declaration of dividends | (5,222) |  |  |  |  |  |  |  |  |  | (5,222) |  |  |  |  |
Ending balance at Mar. 31, 2020 | 494,288 |  |  | $ (203,172) |  |  | $ 468 |  | 97,110 |  | 587,867 |  |  | 12,015 |  |
Ending balance (in shares) at Mar. 31, 2020 |  |  |  | 14,381 |  |  | 46,766 | 10 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | 493,901 | 0 | 493,901 | $ (196,585) |  | (196,585) | $ 467 |  | 96,036 | 96,036 | 573,619 | (597) | 573,022 | 20,364 | 597 | 20,961
Beginning balance (in shares) at Dec. 31, 2019 |  |  |  | 14,069 |  |  | 46,707 | 10 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of changes in accounting principle (ASU 2016-13) | 527,701 | $ 0 | $ 493,901 | $ (213,201) |  | $ (196,585) | $ 468 |  | 99,768 | $ 96,036 | 602,583 | $ (597) | $ 573,022 | 38,083 | $ 597 | $ 20,961
Net income | 39,949 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of taxes | 17,122 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2020 | $ 527,701 |  |  | $ (213,201) |  |  | $ 468 |  | 99,768 |  | 602,583 |  |  | 38,083 |  |
Ending balance (in shares) at Jun. 30, 2020 |  |  |  | 14,953 |  |  | 46,806 | 10 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of changes in accounting principle (ASU 2016-13) | $ 494,288 |  |  | $ (203,172) |  |  | $ 468 |  | 97,110 |  | 587,867 |  |  | 12,015 |  |
Beginning balance at Mar. 31, 2020 | 494,288 |  |  | $ (203,172) |  |  | $ 468 |  | 97,110 |  | 587,867 |  |  | 12,015 |  |
Beginning balance (in shares) at Mar. 31, 2020 |  |  |  | 14,381 |  |  | 46,766 | 10 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of changes in accounting principle (ASU 2016-13) | 527,701 |  |  | $ (213,201) |  |  | $ 468 |  | 99,768 |  | 602,583 |  |  | 38,083 |  |
Vesting of restricted stock units | (424) |  |  | $ (424) |  |  |  |  |  |  |  |  |  |  |  |
Vesting of restricted stock units (in shares) |  |  |  | 25 | [1] |  | 65 |  |  |  |  |  |  |  |  |
Retirement of treasury shares | 0 |  |  | $ 424 |  |  |  |  | (424) |  |  |  |  |  |  |
Retirement of treasury shares, shares (in shares) |  |  |  | (25) | [1] |  | (25) |  |  |  |  |  |  |  |  |
Purchases of treasury stock | (10,029) |  |  | $ (10,029) |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock (in shares) |  |  |  | (572) |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 3,082 |  |  |  |  |  |  |  | 3,082 |  |  |  |  |  |  |
Net income | 19,882 |  |  |  |  |  |  |  |  |  | 19,882 |  |  |  |  |
Other comprehensive income (loss), net of taxes | 26,068 |  |  |  |  |  |  |  |  |  |  |  |  | 26,068 |  |
Declaration of dividends | (5,166) |  |  |  |  |  |  |  |  |  | (5,166) |  |  |  |  |
Ending balance at Jun. 30, 2020 | 527,701 |  |  | $ (213,201) |  |  | $ 468 |  | 99,768 |  | 602,583 |  |  | 38,083 |  |
Ending balance (in shares) at Jun. 30, 2020 |  |  |  | 14,953 |  |  | 46,806 | 10 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of changes in accounting principle (ASU 2016-13) | $ 527,701 |  |  | $ (213,201) |  |  | $ 468 |  | $ 99,768 |  | $ 602,583 |  |  | $ 38,083 |  |
[1] | All shares acquired represent shares tendered to cover the strike price for options and tax withholdings on the intrinsic value of stock options exercised, restricted stock vested, performance share units vested or restricted stock units vested. These shares have been cancelled by the Company.

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