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Consolidated Statements of Changes in Equity - USD ($) shares in Thousands, $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjusted Balance | Common Stock [Member] | Common Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance | Capital Surplus [Member] | Capital Surplus [Member] Cumulative Effect, Period of Adoption, Adjusted Balance | Retained Earnings [Member] | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjusted Balance | Treasury Stock [Member] | Treasury Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect, Period of Adoption, Adjusted Balance | Total Shareholders' Equity [Member] | Total Shareholders' Equity [Member] Cumulative Effect, Period of Adoption, Adjustment | Total Shareholders' Equity [Member] Cumulative Effect, Period of Adoption, Adjusted Balance | Non-Controlling Interests [Member] | Non-Controlling Interests [Member] Cumulative Effect, Period of Adoption, Adjusted Balance
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period (in shares) at Dec. 31, 2017 |  |  |  | 75,148 | 75,148 |  |  |  |  |  | 9,753 | 9,753 |  |  |  |  |  |  |  |
Balance, beginning of period at Dec. 31, 2017 | $ 3,518,334 | $ (2,709) | $ 3,518,334 | $ 4 | $ 4 | $ 1,035,895 | $ 1,035,895 | $ 3,048,487 |  | $ 3,051,196 | $ (552,845) | $ (552,845) | $ (36,174) |  | $ (38,883) | $ 3,495,367 |  | $ 3,495,367 | $ 22,967 | $ 22,967
Balance, beginning of period (Accounting Standards Update 2016-01) at Dec. 31, 2017 |  |  |  |  |  |  |  |  | $ 2,709 |  |  |  |  | $ (2,709) |  |  |  |  |  |
Net income | 446,424 |  |  |  |  |  |  | 445,646 |  |  |  |  |  |  |  | 445,646 |  |  | 778 |
Other comprehensive income (loss), net | (33,702) |  |  |  |  |  |  |  |  |  |  |  | (33,702) |  |  | (33,702) |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 616 |  |  |  |  |  |  |  |  |
Repurchase of common stock | (53,465) |  |  |  |  |  |  |  |  |  | $ (53,465) |  |  |  |  | (53,465) |  |  |  |
Stock options exercised (in shares) |  |  |  | 54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options exercised | 2,781 |  |  |  |  | 2,781 |  |  |  |  |  |  |  |  |  | 2,781 |  |  |  |
Non-vested shares awarded, net (in shares) |  |  |  | 109 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting of non-vested shares (in shares) |  |  |  |  |  |  |  |  |  |  | 31 |  |  |  |  |  |  |  |  |
Vesting of non-vested shares | (2,870) |  |  |  |  |  |  |  |  |  | $ (2,870) |  |  |  |  | (2,870) |  |  |  |
Share-based compensation | 4,229 |  |  |  |  | 4,229 |  |  |  |  |  |  |  |  |  | 4,229 |  |  |  |
Cash dividends on common stock | (127,188) |  |  |  |  |  |  | (127,188) |  |  |  |  |  |  |  | (127,188) |  |  |  |
Capital calls and distributions, net | 12,809 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,809 |
Issuance of shares for CoBiz acquisition (in shares) |  |  |  | 400 |  |  |  |  |  |  | (6,811) |  |  |  |  |  |  |  |  |
Issuance of shares for CoBiz acquisition | 701,311 |  |  | $ 1 |  | 291,125 |  |  |  |  | $ 410,185 |  |  |  |  | 701,311 |  |  |  |
Balance, end of period (in shares) at Dec. 31, 2018 |  |  |  | 75,711 | 75,711 |  |  |  |  |  | 3,589 | 3,589 |  |  |  |  |  |  |  |
Balance, end of period at Dec. 31, 2018 | 4,443,045 |  | 4,445,907 | $ 5 | $ 5 | 1,334,030 | 1,334,030 | 3,369,654 |  | 3,372,516 | $ (198,995) | $ (198,995) | (72,585) |  | (72,585) | 4,432,109 |  | 4,434,971 | 10,936 | 10,936
Balance, end of period (Accounting Standards Update 2016-02) at Dec. 31, 2018 |  | 2,862 |  |  |  |  |  |  | 2,862 |  |  |  |  |  |  |  | $ 2,862 |  |  |
Net income | 500,685 |  |  |  |  |  |  | 500,758 |  |  |  |  |  |  |  | 500,758 |  |  | (73) |
Other comprehensive income (loss), net | 177,508 |  |  |  |  |  |  |  |  |  |  |  | 177,508 |  |  | 177,508 |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 1,572 |  |  |  |  |  |  |  |  |
Repurchase of common stock | (129,483) |  |  |  |  |  |  |  |  |  | $ (129,483) |  |  |  |  | (129,483) |  |  |  |
Stock options exercised (in shares) |  |  |  | 27 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options exercised | 1,421 |  |  |  |  | 1,421 |  |  |  |  |  |  |  |  |  | 1,421 |  |  |  |
Non-vested shares awarded, net (in shares) |  |  |  | 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting of non-vested shares (in shares) |  |  |  |  |  |  |  |  |  |  | 18 |  |  |  |  |  |  |  |  |
Vesting of non-vested shares | (1,428) |  |  |  |  |  |  |  |  |  | $ (1,428) |  |  |  |  | (1,428) |  |  |  |
Share-based compensation | 15,544 |  |  |  |  | 15,544 |  |  |  |  |  |  |  |  |  | 15,544 |  |  |  |
Cash dividends on common stock | (143,496) |  |  |  |  |  |  | (143,496) |  |  |  |  |  |  |  | (143,496) |  |  |  |
Capital calls and distributions, net | 2,739 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,739 |
Balance, end of period (in shares) at Dec. 31, 2019 |  |  |  | 75,759 | 75,759 |  |  |  |  |  | 5,179 | 5,179 |  |  |  |  |  |  |  |
Balance, end of period at Dec. 31, 2019 | 4,863,919 |  | $ 4,817,223 | $ 5 | $ 5 | 1,350,995 | $ 1,350,995 | 3,729,778 |  | $ 3,683,082 | $ (329,906) | $ (329,906) | 104,923 |  | $ 104,923 | 4,855,795 |  | $ 4,809,099 | 8,124 | $ 8,124
Balance, end of period (Accounting Standards Update 2016-13) at Dec. 31, 2019 |  | $ (46,696) |  |  |  |  |  |  | $ (46,696) |  |  |  |  |  |  |  | $ (46,696) |  |  |
Net income | 435,071 |  |  |  |  |  |  | 435,030 |  |  |  |  |  |  |  | 435,030 |  |  | 41 |
Other comprehensive income (loss), net | 230,945 |  |  |  |  |  |  |  |  |  |  |  | 230,945 |  |  | 230,945 |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 1,107 |  |  |  |  |  |  |  |  |
Repurchase of common stock | (75,830) |  |  |  |  |  |  |  |  |  | $ (75,830) |  |  |  |  | (75,830) |  |  |  |
Stock options exercised (in shares) |  |  |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options exercised | 675 |  |  |  |  | 675 |  |  |  |  |  |  |  |  |  | 675 |  |  |  |
Non-vested shares awarded, net (in shares) |  |  |  | 224 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting of non-vested shares (in shares) |  |  |  |  |  |  |  |  |  |  | 72 |  |  |  |  |  |  |  |  |
Vesting of non-vested shares | (5,608) |  |  |  |  |  |  |  |  |  | $ (5,608) |  |  |  |  | (5,608) |  |  |  |
Share-based compensation | 16,392 |  |  |  |  | 16,392 |  |  |  |  |  |  |  |  |  | 16,392 |  |  |  |
Cash dividends on common stock | (144,437) |  |  |  |  |  |  | (144,437) |  |  |  |  |  |  |  | (144,437) |  |  |  |
Capital calls and distributions, net | 17,130 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,130 |
Balance, end of period (in shares) at Dec. 31, 2020 |  |  |  | 75,995 |  |  |  |  |  |  | 6,358 |  |  |  |  |  |  |  |  |
Balance, end of period at Dec. 31, 2020 | $ 5,291,561 |  |  | $ 5 |  | $ 1,368,062 |  | $ 3,973,675 |  |  | $ (411,344) |  | $ 335,868 |  |  | $ 5,266,266 |  |  | $ 25,295 |

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