Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other intangible assets:
Estimated Fair Value	$ 78,300	$ 78,300
Accumulated Amortization	18,975	16,865
Net Carrying Amount	59,325	61,435
Customer relationships
Other intangible assets:
Estimated Fair Value	42,000	42,000
Accumulated Amortization	8,591	7,636
Net Carrying Amount	33,409	34,364
Other
Other intangible assets:
Estimated Fair Value	36,300	36,300
Accumulated Amortization	10,384	9,229
Net Carrying Amount	$ 25,916	$ 27,071