Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets:
Policy loans	$ 213,467	$ 211,986
Cash and cash equivalents	41,120	55,924
Accrued investment income	20,984	19,539
Reinsurance recoverables	4,310,574	3,200,642
Receivables from parent and affiliates	39,848	32,820
Liabilities:
Cash collateral for loaned securities	2,700	2,481
Short-term debt	0
Fair Value
Assets:
Commercial mortgage and other loans	145,067	148,855
Policy loans	213,467	211,986
Cash and cash equivalents	5,181	28
Accrued investment income	20,984	19,539
Reinsurance recoverables	28,020	26,400
Receivables from parent and affiliates	37,532	30,387
Other assets	4,725	3,071
Total assets	454,976	440,266
Liabilities:
Policyholders’ account balances - investment contracts	250,204	232,714
Cash collateral for loaned securities	2,700	2,481
Short-term debt	0	89
Payables to parent and affiliates	26,632	24,958
Other liabilities	38,502	41,310
Total liabilities	318,038	301,552
Carrying Amount
Assets:
Commercial mortgage and other loans	137,914	143,098
Policy loans	213,467	211,986
Cash and cash equivalents	5,181	28
Accrued investment income	20,984	19,539
Reinsurance recoverables	27,465	26,286
Receivables from parent and affiliates	37,532	30,387
Other assets	4,725	3,071
Total assets	447,268	434,395
Liabilities:
Policyholders’ account balances - investment contracts	249,648	232,600
Cash collateral for loaned securities	2,700	2,481
Short-term debt	0	89
Payables to parent and affiliates	26,632	24,958
Other liabilities	38,502	41,310
Total liabilities	317,482	301,438
Level 1 | Fair Value
Assets:
Commercial mortgage and other loans	0	0
Policy loans	0	0
Cash and cash equivalents	5,181	28
Accrued investment income	0	0
Reinsurance recoverables	0	0
Receivables from parent and affiliates	0	0
Other assets	0	0
Total assets	5,181	28
Liabilities:
Policyholders’ account balances - investment contracts	0	0
Cash collateral for loaned securities	0	0
Short-term debt	0	0
Payables to parent and affiliates	0	0
Other liabilities	0	0
Total liabilities	0	0
Level 2 | Fair Value
Assets:
Commercial mortgage and other loans	0	0
Policy loans	0	0
Cash and cash equivalents	0	0
Accrued investment income	20,984	19,539
Reinsurance recoverables	0	0
Receivables from parent and affiliates	37,532	30,387
Other assets	4,725	3,071
Total assets	63,241	52,997
Liabilities:
Policyholders’ account balances - investment contracts	209,012	192,239
Cash collateral for loaned securities	2,700	2,481
Short-term debt	0	89
Payables to parent and affiliates	26,632	24,958
Other liabilities	38,502	41,310
Total liabilities	276,846	261,077
Level 3 | Fair Value
Assets:
Commercial mortgage and other loans	145,067	148,855
Policy loans	213,467	211,986
Cash and cash equivalents	0	0
Accrued investment income	0	0
Reinsurance recoverables	28,020	26,400
Receivables from parent and affiliates	0	0
Other assets	0	0
Total assets	386,554	387,241
Liabilities:
Policyholders’ account balances - investment contracts	41,192	40,475
Cash collateral for loaned securities	0	0
Short-term debt	0	0
Payables to parent and affiliates	0	0
Other liabilities	0	0
Total liabilities	$ 41,192	$ 40,475