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Employee Benefit Plans (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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 | $ 13,900,000 | $ 10,300,000 | $ 13,000,000
Deferred compensation expense | $ 2,700,000 | 2,700,000 | 2,300,000
Defined Contribution Plan Disclosure [Line Items] |  |  |
Purchase price of common stock (as percent) | 95.00% |  |
Allocated stock-based compensation expense | $ 15,900,000 | $ 13,200,000 | $ 12,900,000
Compensation not yet recognized, stock options | 0 |  |
Compensation not yet recognized, share-based awards other than options | $ 16,100,000 |  |
Compensation cost not yet recognized, period for recognition | 1 year 8 months 12 days |  |
Options outstanding, intrinsic value | $ 3,300,000 |  |
Share price (in dollars per share) | $ 29.58 |  |
Options, exercises in period | 184,888 | 900 | 3,050
Options, exercises in period, intrinsic value | $ 1,300,000 | $ 10,000 | $ 43,000
Options, grants in period, gross | 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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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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