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Employee Benefit Plans - Summary of Fair value of Qualified trust assets and Funded (Unfunded) status of Pension Plan (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Pension Plan [Member]  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]  
Benefit obligation, beginning of year $ 0
Assumed in business combination 2,041
Service cost 0
Interest cost 45
Actuarial loss (gain) 34
Benefit payments (971)
Settlement (gain) loss 0
Benefit obligation, end of year 1,149
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]  
Fair value of plan assets, beginning of year 0
Acquired in business combination 1,330
Actual return on plan assets 97
Employer contributions 703
Benefits payments (971)
Fair value of plan assets, end of year 1,159
Funded (unfunded) status, end of year 10
PRB Plan [Member]  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]  
Benefit obligation, beginning of year 0
Assumed in business combination 65
Service cost 0
Interest cost 2
Actuarial loss (gain) (9)
Benefit payments (6)
Settlement (gain) loss 0
Benefit obligation, end of year 52
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]  
Fair value of plan assets, beginning of year 0
Acquired in business combination 0
Actual return on plan assets 0
Employer contributions 6
Benefits payments (6)
Fair value of plan assets, end of year 0
Funded (unfunded) status, end of year $ (52)