Summary of Significant Accounting Policies Cost of Customer Relationships Acquired (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of years of available premiums	50 years
Number of Years-Cost of Customer Relationship Acquired Amortization	5 years
2019	$ 1,459
2020	1,311
2021	1,181
2022	1,068
2023	966
Thereafter	9,402
Intangible Assets Arising from Insurance Contracts Acquired in Business Combination, Amortization Expense	15,387
Effects of unrealized (gains) losses on CCRA	(162)
Cost of customer relationships acquired	15,225	$ 17,499	$ 19,415	$ 21,585
Acquisitions	0	0	0
Amortization	(2,458)	(2,129)	(2,063)
Change in effects of unrealized (gains) losses on CCRA	$ 184	$ 213	$ (107)
Customer Relationships [Member] | Minimum [Member]
Interest Accrual Rate Associated with Amortization Method of Present Value of Future Insurance Profits	3.70%
Customer Relationships [Member] | Maximum [Member]
Interest Accrual Rate Associated with Amortization Method of Present Value of Future Insurance Profits	8.50%