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Employee Benefit and Deferred Compensation Plans - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) plan point shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2007 officer
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Accumulated benefit obligation | $ 28,226,000 | $ 28,020,000 |  |
Retiring age limit, minimum | 55 years |  |  |
Retiring age limit, maximum | 65 years |  |  |
Eligible employee from service (in years) | 15 years |  |  |
Number of points for eligibility (points) | point | 70 |  |  |
Minimum eligible age for Medicare coverage | 65 years |  |  |
Expected company contributions | $ 360,000 |  |  |
Health care cost trend rate (percent) | 5.40% |  |  |
Redemption notice | 60 days |  |  |
Employee deferrals (percent) | 4.00% |  |  |
Percentage of plan compensation as nondiscretionary contribution | 5.00% |  |  |
Percentage of plan compensation in excess of social security wage base | 5.00% |  |  |
Hours of service credited to the employees during the year | 1000 hours |  |  |
Employee deferrals amounts | $ 17,888,000 | 16,009,000 | $ 13,477,000 |
Number of conventional deferred compensation plans | plan | 2 |  |  |
Company's deferred compensation plan expense | $ 3,965,000 | 3,610,000 | 1,290,000 |
Number of officers provided for | officer |  |  |  | 4
Expiration period subsequent to retirement |  |  |  | 15 years
Supplemental executive retirement liabilities totaled | 3,816,000 | 3,921,000 |  |
Incentive compensation plan expense | $ 6,425,000 | $ 4,200,000 | $ 5,117,000 |
Option expiration period | 10 years |  |  |
Granted (shares) | shares | 0 | 0 | 0 |
Intrinsic value of options exercised | $ 279,000 | $ 290,000 | $ 1,180,000 |
Common shares reserved for issuance under employee benefit plans (shares) | shares | 2,871,774 |  |  |
401(k) Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Common shares reserved for issuance under employee benefit plans (shares) | shares | 957,320 |  |  |
Deferred Stock Unit Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Common shares reserved for issuance under employee benefit plans (shares) | shares | 22,577 |  |  |
2011 Long-Term Incentive Compensation Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Common shares reserved for issuance under employee benefit plans (shares) | shares | 1,758,149 |  |  |
Stock compensation plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Compensation expense | $ 0 | 0 | 0 |
Performance- Based Restricted Stock |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Compensation expense | 10,419,000 | 10,046,000 | 7,251,000 |
Time- Based Restricted Stock |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Unrecognized stock-based compensation expense | $ 10,185,000 |  |  |
Weighted average period over which unrecognized expense is expected to be recognized (in years) | 1 year 10 months 6 days |  |  |
Growth Investment |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Equity income strategy (percent) | 55.00% |  |  |
Real Estate | Growth Investment |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Equity income strategy (percent) | 5.00% |  |  |
Interest Rate Contract | Growth Investment |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Equity income strategy (percent) | 45.00% |  |  |
Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Company contribution to pension benefit plan | $ 0 | 0 |  |
Accumulated benefit obligation | 28,226,000 | 28,020,000 | $ 24,945,000 |
Other Postretirement Benefits Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Company contribution to pension benefit plan | $ 214,000 | $ 151,000 |  |

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