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Employee Benefit Plans (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 08, 2018 | Feb. 28, 2018 | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Share-based Payment Arrangement [Abstract] |  |  |  |  |
Employer matching contribution, percent of match for first 3% of compensation |  |  | 100.00% |  |
Employer matching contribution, percent of employees' gross pay, first 3% |  |  | 3.00% |  |
Employer matching contribution, percent of match for the next 2% of compensation |  |  | 50.00% |  |
Employer matching contribution, percent of employees' gross pay, next 2% |  |  | 2.00% |  |
Employer matching contribution, percent of match total |  |  | 4.00% |  |
Employer matching contribution, percent of employees' gross pay total |  |  | 5.00% |  |
Employee stock ownership plan, contribution expense |  |  | $ 10,280,000 | $ 13,021,000 | $ 10,769,000
Deferred compensation expense |  |  | $ 2,716,000 | 2,294,000 | 2,309,000
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Purchase price of common stock (as percent) |  |  | 95.00% |  |
Stock split, conversion ratio | 2 | 2 |  |  |
Allocated stock-based compensation expense |  |  | $ 13,197,000 | $ 12,921,000 | $ 11,227,000
Compensation not yet recognized, stock options |  |  | 0 |  |
Compensation not yet recognized, share-based awards other than options |  |  | $ 15,524,000 |  |
Compensation cost not yet recognized, period for recognition |  |  | 1 year 8 months 12 days |  |
Options outstanding, intrinsic value |  |  | $ 134,000 |  |
Share price (in dollars per share) | $ / shares |  |  | $ 21.59 |  |
Options, exercises in period | shares |  |  | 900 | 3,050 | 111,728
Options, exercises in period, intrinsic value |  |  | $ 10,000 | $ 43,000 | $ 561,000
Options, grants in period, gross | shares |  |  | 0 | 0 | 0
Employee Stock Purchase Plan 2015 |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Maximum annual contributions per employee, amount |  |  | $ 25,000 |  |
Service period |  |  | 6 months |  |
Special Employee Stock Purchase Plan 2015 |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Maximum annual contributions per employee, amount |  |  | $ 10,000 |  |
Purchase price of common stock (as percent) |  |  | 85.00% |  |

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