Employee Benefits - Asset Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 229,701	$ 283,940
Actual % of total	100.00%	100.00%
Fixed maturity securities - corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 18,102	$ 21,683
Actual % of total	7.90%	7.60%
Fixed maturity securities - corporate bonds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	0.00%
Fixed maturity securities - corporate bonds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	15.00%
Redeemable preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 2,946	$ 4,633
Actual % of total	1.30%	1.60%
Redeemable preferred stocks | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	0.00%
Redeemable preferred stocks | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	10.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 134,663	$ 178,766
Actual % of total	58.60%	63.10%
Equity securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	50.00%
Equity securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	70.00%
Core plus bond separate account fund
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 16,768	$ 23,916
Actual % of total	7.30%	8.40%
Core plus bond separate account fund | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	0.00%
Core plus bond separate account fund | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	40.00%
U.S. property separate account fund
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 28,468	$ 27,328
Actual % of total	12.40%	9.60%
U.S. property separate account fund | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	0.00%
U.S. property separate account fund | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	25.00%
Arbitrage fund
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 10,831	$ 10,588
Actual % of total	4.70%	3.70%
Arbitrage fund | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	0.00%
Arbitrage fund | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	10.00%
United Life annuity
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 12,567	$ 11,968
Actual % of total	5.50%	4.20%
United Life annuity | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	0.00%
United Life annuity | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	10.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 5,356	$ 5,058
Actual % of total	2.30%	1.80%
Cash and cash equivalents | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	0.00%
Cash and cash equivalents | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	10.00%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 229,701	$ 283,940	$ 248,735