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Share-based Compensation and Other Employment Benefit Plans (Narrative) (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) simulation shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Jan. 01, 2019 | Apr. 25, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 3 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period | 3 years |  |  |  |
Options exercised (in shares) | shares | 572,000 | 820,000 | 126,000 |  |
Tax benefit recognized from compensation expense | $ 4,800 | $ 6,300 | $ 4,300 |  |
Unrecognized compensation cost | $ 26,100 |  |  |  |
Unrecognized compensation cost, period of recognition (years) | 1 year 5 months 19 days |  |  |  |
Stock option grants (in shares) | shares | 0 | 0 | 0 |  |
Assumed in acquisition (in shares) | shares | 0 | 3,230,000 | 0 |  |
Options outstanding, intrinsic value | $ 25,100 |  |  |  |
Options outstanding, weighted average remaining contractual term (years) | 3 years 3 months 7 days |  |  |  |
Options exercised, intrinsic value | $ 5,300 | $ 13,600 | $ 4,400 |  |
Performance period | 3 years |  |  |  |
Merger-Related Expense |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense | $ 0 | $ 4,219 | 0 |  |
FCB Financial Holdings, Inc. |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Assumed in acquisition (in shares) | shares |  | 3,200,000 |  |  |
FCB Financial Holdings, Inc. | FCB Financial Holdings, Inc. |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Merger exchange ratio |  |  |  | 1.055 |
Restricted Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost | 22,100 |  |  |  |
Non-option awards vested, total fair value | 13,400 | $ 11,200 | 13,600 |  |
Market Restricted Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost | $ 1,400 |  |  |  |
Number of simulations | simulation | 100,000 |  |  |  |
Non-option awards vested, total fair value | $ 3,900 | 2,200 | 5,100 |  |
Performance Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost | 2,600 |  |  |  |
Non-option awards vested, total fair value | $ 4,000 | $ 3,500 | $ 4,300 |  |
vesting |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 3 years |  |  |  |
performance period |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 3 years |  |  |  |
ROAA and ROATCE |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 3 years |  |  |  |
Minimum | Market Restricted Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting range based on return on average assets (ROAA) | 75.00% |  |  |  |
Minimum | Performance Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options, vested and expected to vest, range based on return on average assets | 0.00% |  |  |  |
Maximum | Market Restricted Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting range based on return on average assets (ROAA) | 125.00% |  |  |  |
Maximum | Performance Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options, vested and expected to vest, range based on return on average assets | 150.00% |  |  |  |
2013 Omnibus Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares of authorized but unissued common stock reserved for future grants (in shares) | shares | 1,500,000 |  |  |  | 8,600,000
Grants for option equivalent (in shares) | shares |  |  |  |  | 1
Grants of full value awards equivalents (in shares) | shares |  |  |  |  | 2

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