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Employee Benefit Plans (Narrative) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2030 | Dec. 20, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined contribution plan employer contribution percentage for branch offices, minimum | 5.10% |  |  |  |
Defined contribution plan employer contribution percentage for branch offices, maximum | 64.80% |  |  |  |
Company contributions | $ 6,825,000 | $ 4,750,000 | $ 77,743,000 |  |
Pension Plans Defined Benefit [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Estimated transition obligation amortized from accumulated other comprehensive income into net public benefit cost over the next year | 0 |  |  |  |
Estimated actuarial loss amortized from accumulated other comprehensive income into net periodic benefit cost over the next year | (7,709,000) |  |  |  |
Estimated prior service cost amortized from accumulated other comprehensive income into net periodic benefit cost over the next year | 0 |  |  |  |
Company contributions | 6,825,000 | 4,750,000 |  |  |
Defined Benefit Postretirement Health Coverage [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Estimated transition obligation amortized from accumulated other comprehensive income into net public benefit cost over the next year | 0 |  |  |  |
Estimated actuarial loss amortized from accumulated other comprehensive income into net periodic benefit cost over the next year | 46,000 |  |  |  |
Estimated prior service cost amortized from accumulated other comprehensive income into net periodic benefit cost over the next year | $ (577,000) | $ (577,000) | $ (577,000) |  |
Weighted average discount rate used to determine net periodic benefit cost | 3.28% | 4.27% | 3.62% |  |
Rate of compensation increase to determine the net periodic benefit cost | 4.00% | 4.00% | 4.00% |  |
Expected long-term rate of return on plan assets | 7.00% | 7.00% | 7.00% |  |
Weighted average discount rates used to determine actuarial present value of the projected benefit obligation | 2.55% | 3.28% | 4.27% |  | 3.28%
Defined contribution plans, employer contribution plans, employer contribution percentage, maximum | 3.00% |  |  |  |
Defined contribution plans, employer contribution percentage, for new hires, minimum | 3.00% |  |  |  |
Defined contribution plans, employer contribution percentage, for new hires, maximum | 8.00% |  |  |  |
Defined Contribution Plan Employer Contribution Percentage Vested After Three Years | 100.00% |  |  |  |
Healthcare inflation rate | 6.75% |  |  |  |
Defined Benefit Postretirement Health Coverage [Member] | Scenario Forecast [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Healthcare inflation rate |  |  |  | 4.75% |
Defined Benefit Postretirement Health Coverage [Member] | Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Plan assets consist of shares in investment trusts, percentage | 72.00% |  |  |  |
Defined Benefit Postretirement Health Coverage [Member] | Fixed Maturities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Plan assets consist of shares in investment trusts, percentage | 27.00% |  |  |  |
Defined Benefit Postretirement Health Coverage [Member] | Limited Partnerships [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Plan assets consist of shares in investment trusts, percentage | 1.00% |  |  |  |
Defined Benefit Postretirement Health Coverage [Member] | Cash [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Plan assets consist of shares in investment trusts, percentage | 0.00% |  |  |  |
Defined Benefit Postretirement Health Coverage [Member] | Equity Funds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target asset allocation percentage | 70.00% |  |  |  |
Defined Benefit Postretirement Health Coverage [Member] | Bonds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target asset allocation percentage | 30.00% |  |  |  |
Defined Benefit Postretirement Health Coverage [Member] | Qualified Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Private equity limited partnerships | $ 4,596,000 | $ 20,351,000 |  |  |
Company contributions |  |  |  |  |

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