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Business Combinations - Summary of Expected Amortization Expenses (Details) - Ozark National Life Insurance Company And NIS
$ in Thousands
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]  
2021 $ 730
2022 730
2023 730
2024 730
2025 730
Thereafter 1,552
Finite-lived intangible assets, net $ 5,202