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Stock-Based Compensation - Additional Information (Details) | 3 Months Ended | 12 Months Ended | 24 Months Ended
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Mar. 31, 2021 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) AGE $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for grant | shares | 8,481,554 |  | 11,913,461 |  |  | 11,913,461
Shares granted | shares |  |  | 2,421,345 |  |  |
Shares granted, weighted average grant date fair value | $ / shares |  |  | $ 11.61 |  |  |
Unrecognized compensation cost relating to unvested restricted stock | $ |  |  | $ 52,500,000 |  |  | $ 52,500,000
Unrecognized compensation cost relating to unvested restricted stock, recognition period (in years) |  |  | 2 years 9 months 18 days |  |  |
Employer Discretionary Contribution Amount | $ |  |  | $ 5,700,000 | $ 0 |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted, vesting period |  |  | 5 years |  |  |
Shares granted | shares | 3,029,949 | 2,387,645 | 2,421,345 |  |  |
Shares granted, weighted average grant date fair value | $ / shares | $ 11.15 | $ 11.64 | $ 11.61 |  |  |
Compensation and benefits expense | $ | $ 8,000,000.0 | $ 7,800,000 | $ 28,400,000 | $ 30,900,000 | $ 36,300,000 |
Unrecognized compensation cost relating to unvested restricted stock | $ | $ 77,600,000 |  |  |  |  |
Unrecognized compensation cost relating to unvested restricted stock, recognition period (in years) | 3 years 7 months 6 days |  |  |  |  |
Forfeited shares | shares | 59,260 |  | 528,507 |  |  |
Performance Based Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted | shares | 307,479 |  | 446,181 | 418,674 |  | 477,872
Compensation and benefits expense | $ | $ 586,000,000 | 407,000,000 |  |  |  |
Unrecognized compensation cost relating to unvested restricted stock | $ | $ 6,300,000 |  | $ 3,100,000 |  |  | $ 3,100,000
Unrecognized compensation cost relating to unvested restricted stock, recognition period (in years) | 2 years 1 month 6 days |  | 1 year 9 months 18 days |  |  |
Vesting rights, description |  |  | Included in this total are 446,181 shares granted during the twelve months ended December 31, 2020, which have a performance period of January 1, 2020 to December 31, 2022 and vest on April 1, 2023, subject to adjustment or forfeiture, based upon the achievement by the Company of certain performance standards. During the twelve months ended December 31, 2020, 386,983 shares were forfeited. The Company granted 418,674 PSUs during 2019, which have a performance period of January 1, 2019 to December 31, 2021 and vest on April 1, 2022, subject to adjustment or forfeiture, based upon the achievement by the Company of certain performance standards. |  |  |
Compensation and benefits expense | $ |  |  | $ 1,000,000.0 | $ 1,100,000 |  |
Forfeited shares | shares |  |  | 386,983 |  |  |
Stock Incentive Plan Twenty Twelve | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted | shares |  |  |  | 2,031,198 | 2,543,023 |
Shares granted, weighted average grant date fair value | $ / shares |  |  |  | $ 10.45 | $ 13.50 |
Four Zero One K Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Employer Discretionary Contribution Amount | $ | $ 1,700,000 | $ 1,600,000 |  |  |  |
Supplemental Executive Retirement Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Trust held assets of Supplemental Executive Retirement Plan (SERP), shares | shares |  |  | 2,191,915 | 2,046,449 |  | 2,191,915
Share-based Payment Arrangement, Tranche One | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted, vesting period | 1 year | 1 year |  |  |  |
Share-based Payment Arrangement, Tranche Two | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted, vesting period | 5 years | 5 years |  |  |  |
New York Community Bank |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Full-time employees, age to participate in plan | AGE |  |  | 21 |  |  |
Description of the ESOP Plan |  |  | All full-time employees who have attained 21 years of age and have completed twelve consecutive months of credited service are eligible to participate in the ESOP, with benefits vesting on a six-year basis |  |  |
Shares granted, vesting period |  |  | 6 years |  |  |
Allocated shares to participants in the ESOP | shares |  |  | 405,167 | 349,356 | 529,531 | 405,167
ESOP-related compensation expense | $ |  |  | $ 4,300,000 | $ 4,200,000 | $ 5,000,000.0 |
New York Community Bank | Third year of employment |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of shares vested |  |  | 20.00% |  |  |
New York Community Bank | Each successive year after third year |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of shares vested |  |  | 20.00% |  |  |

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