Fair Value Measurement - Methodologies Other Than Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Carrying Value
Financial assets:
Other assets	$ 31,128	$ 28,645
Financial liabilities:
Other liabilities	30,334	27,953
Carrying Value | Senior Notes
Financial liabilities:
Debt	250,000	250,000
Carrying Value | Mortgage Loans
Financial liabilities:
Debt	36,113	37,617
Fair Value
Financial assets:
Other assets	31,141	28,650
Financial liabilities:
Other liabilities	30,334	27,953
Fair Value | Senior Notes
Financial liabilities:
Debt	269,160	273,865
Fair Value | Mortgage Loans
Financial liabilities:
Debt	36,113	37,617
BOLI | Carrying Value
Financial assets:
Other investments	67,847	66,112
BOLI | Fair Value
Financial assets:
Other investments	67,847	66,112
Other Investments | Carrying Value
Financial assets:
Other investments	2,952	2,931
Other Investments | Fair Value
Financial assets:
Other investments	$ 2,952	$ 2,931