Defined Contribution Plan Employer Contribution Percentage For Branch Offices Maximum

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Defined Contribution Plan Employer Contribution Percentage For Branch Offices Minimum

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Defined Contribution Plan Employer Contribution Percentage For New Hires Maximum

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Defined Contribution Plan Employer Contribution Percentage For New Hires Minimum

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Defined Contribution Plan Employer Contribution Percentage Maximum

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Defined Contribution Plan Employer Contribution Percentage Vested After Three Years

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Private Equity Limited Partnership

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

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Amount included in accumulated other comprehensive income (loss) for transition asset (obligation) expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Employee Benefit Plans (Narrative) (Details) - USD ($)	12 Months Ended
Employee Benefit Plans (Narrative) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2029
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan employer contribution percentage for branch offices, minimum	4.90%
Defined contribution plan employer contribution percentage for branch offices, maximum	45.70%
Company contributions	$ 4,750,000	$ 77,743,000	$ 10,534,000
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	(9,461,000)
Estimated prior service cost amortized from accumulated other comprehensive income into net periodic benefit cost over the next year	0
Pension Plans Defined Benefit [Member] \| Scenario Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Healthcare inflation rate				4.50%
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	0
Estimated prior service cost amortized from accumulated other comprehensive income into net periodic benefit cost over the next year	$ (577,000)	$ (577,000)	$ (131,000)
Weighted average discount rate used to determine net periodic benefit cost	4.27%	3.62%	4.16%
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%	7.50%
Weighted average discount rates used to determine actuarial present value of the projected benefit obligation	3.28%	4.27%	3.62%
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	7.00%
Defined Benefit Postretirement Health Coverage [Member] \| Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets consist of shares in investment trusts, percentage	62.00%
Defined Benefit Postretirement Health Coverage [Member] \| Fixed Maturities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets consist of shares in investment trusts, percentage	30.00%
Defined Benefit Postretirement Health Coverage [Member] \| Limited Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets consist of shares in investment trusts, percentage	7.00%
Defined Benefit Postretirement Health Coverage [Member] \| Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets consist of shares in investment trusts, percentage	1.00%
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	$ 20,351,000	$ 20,091,000
Company contributions		$ 77,000,000