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Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Cumulative effect adjustment from adoption of ASU 2016-01 | Accounting Standards Update 2014-09 | FCB Financial Holdings, Inc. | Series C Preferred Stock | Series D Preferred Stock | Series E Preferred Stock | Preferred Stock | Preferred Stock Series C Preferred Stock | Preferred Stock Series D Preferred Stock | Preferred Stock Series E Preferred Stock | Common Stock | Common Stock FCB Financial Holdings, Inc. | Additional Paid-in Capital | Additional Paid-in Capital FCB Financial Holdings, Inc. | Treasury Stock | Treasury Stock FCB Financial Holdings, Inc. | AOCI | AOCI Cumulative effect adjustment from adoption of ASU 2016-01 | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings Cumulative effect adjustment from adoption of ASU 2016-01 | Retained Earnings Accounting Standards Update 2014-09 | Retained Earnings FCB Financial Holdings, Inc. | Retained Earnings Series C Preferred Stock
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Beginning balance at Dec. 31, 2017 |  | $ 2,961,566 |  | $ 0 | $ (685) |  |  |  |  | $ 125,980 |  |  |  | $ 142,678 |  | $ 3,043,129 |  | $ (839,674) |  | $ (54,754) | $ 117 | $ 544,207 |  | $ (117) | $ (685) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from adoption of ASU 2018-02 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,588) |  | 7,588 |  |  |  |  |
Net income |  | 428,476 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 428,476 |  |  |  |  |
Other comprehensive income (loss), net of income taxes |  | (32,195) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (32,195) |  |  |  |  |  |  |
Cash dividends declared on common stock |  | (117,355) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (117,355) |  |  |  |  |
Cash dividends paid on Preferred Stock | [1] | (13,978) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (13,978) |  |  |  |  |
Repurchases of common stock including costs to repurchase |  | (175,072) |  |  |  |  | $ (130,000) |  |  |  | $ (125,980) |  |  | (175,000) |  |  |  | (175,072) |  |  |  |  |  |  |  |  | $ (4,020)
Issuance of Preferred Stock, net of issuance costs |  |  |  |  |  |  |  | $ 195,140 |  |  |  | $ 195,140 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for earnout payment |  | 7,427 |  |  |  |  |  |  |  |  |  |  |  | 199 |  | 7,228 |  |  |  |  |  |  |  |  |  |  |
Restricted share unit vesting and taxes paid related to net share settlement |  | (8,504) |  |  |  |  |  |  |  |  |  |  |  | 297 |  | (8,452) |  |  |  |  |  | (349) |  |  |  |  |
Stock options exercised, net |  | 2,139 |  |  |  |  |  |  |  |  |  |  |  | 126 |  | 2,013 |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  | 16,643 |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,643 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 |  | $ 3,133,602 | $ 4,270 |  |  |  |  |  |  | 195,140 |  |  |  | 143,300 |  | 3,060,561 |  | (1,014,746) |  | (94,420) |  | 843,767 | $ 4,270 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 563,780 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 563,780 |  |  |  |  |
Other comprehensive income (loss), net of income taxes |  | 160,061 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160,061 |  |  |  |  |  |  |
Cash dividends declared on common stock |  | (183,091) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (183,091) |  |  |  |  |
Cash dividends paid on Preferred Stock | [1] | (22,881) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (22,881) |  |  |  |  |
Repurchases of common stock including costs to repurchase |  | (725,398) |  |  |  |  |  |  |  |  |  |  |  | (725,000) |  |  |  | (725,398) |  |  |  |  |  |  |  |  |
Issuance of Preferred Stock, net of issuance costs |  |  |  |  |  |  |  |  | $ 342,005 |  |  |  | $ 342,005 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for earnout payment |  | 11,846 |  |  |  | $ 704,146 |  |  |  |  |  |  |  | 344 | $ 22,043 | 11,502 | $ 682,103 |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  |  |  |  | 877,570 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,014,746 |  |  |  |  |  |  | $ (137,176) |
Fair value of exchanged equity awards and warrants attributed to purchase price |  |  |  |  |  | $ 43,972 |  |  |  |  |  |  |  |  |  |  | $ 43,972 |  |  |  |  |  |  |  |  |  |
Restricted share unit vesting and taxes paid related to net share settlement |  | (8,855) |  |  |  |  |  |  |  |  |  |  |  | 302 |  | (8,831) |  |  |  |  |  | (326) |  |  |  |  |
Stock options exercised, net |  | 16,176 |  |  |  |  |  |  |  |  |  |  |  | 812 |  | 15,364 |  |  |  |  |  |  |  |  |  |  |
Warrants exercised with net settlement and common stock reissued |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,822) |  | 9,838 |  |  |  | (16) |  |  |  |  |
Share-based compensation expense |  | 24,487 |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,487 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 |  | $ 4,941,690 | $ (35,721) |  |  |  |  |  |  | 537,145 |  |  |  | 166,801 |  | 3,819,336 |  | (715,560) |  | 65,641 |  | 1,068,327 | $ (35,721) |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 1.20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 373,695 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 373,695 |  |  |  |  |
Other comprehensive income (loss), net of income taxes |  | 92,994 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92,994 |  |  |  |  |  |  |
Cash dividends declared on common stock |  | (194,658) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (194,658) |  |  |  |  |
Cash dividends paid on Preferred Stock | [1] | (33,163) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (33,163) |  |  |  |  |
Repurchases of common stock including costs to repurchase |  | (16,246) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,246) |  |  |  |  |  |  |  |  |
Issuance of common stock for earnout payment |  | 8,695 |  |  |  |  |  |  |  |  |  |  |  | 379 |  | 8,316 |  |  |  |  |  |  |  |  |  |  |
Restricted share unit vesting and taxes paid related to net share settlement |  | (7,575) |  |  |  |  |  |  |  |  |  |  |  | 389 |  | (7,503) |  |  |  |  |  | (461) |  |  |  |  |
Stock options exercised, net |  | 12,982 |  |  |  |  |  |  |  |  |  |  |  | 564 |  | 12,418 |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  | 18,641 |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,641 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 |  | $ 5,161,334 |  |  |  |  |  |  |  | $ 537,145 |  |  |  | $ 168,133 |  | $ 3,851,208 |  | $ (731,806) |  | $ 158,635 |  | $ 1,178,019 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 1.32 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | For the year ended December 31, 2020, dividends per share were $1.58 and $1.47 for Series D and Series E Preferred Stock, respectively. For the year ended December 31, 2019, dividends per share were $1.58 and $0.73 for Series D and Series E Preferred Stock, respectively. For the year ended December 31, 2018, dividends per share were $1.48 and $0.79 for Series C and D Preferred Stock. respectively. (2) For additional information, see "Part II - Item 8. Financial Statements and Supplementary Data - Note 1 - Summary of Significant Accounting Policies.

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