Variable Interest Entities and Other Investments - Additional Information (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) Customer	Mar. 31, 2019 USD ($)	Dec. 31, 2016 Customer
Variable Interest Entities and Other Investments [Line Items]
Equity method investments	$ 12,498,000	$ 8,681,000	$ 8,714,000	$ 10,208,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities and Other Investments [Line Items]
Cost method investments	19,800,000	18,700,000
Loss recognized from assets at fair value	300,000
Gain recognized from assets at fair value		700,000
Equity method investments	12,500,000	8,700,000
Total marketable equity securities	1,500,000	1,900,000
Number of loan customers | Customer					2
Number of loan customers sold | Customer			1
Net profits interest	4,100,000	4,300,000
Variable Interest Entity, Not Primary Beneficiary | Rabbi Trust
Variable Interest Entities and Other Investments [Line Items]
Defined rabbi trust assets and benefit obligation	3,300,000	3,700,000
Variable Interest Entity, Not Primary Beneficiary | Limited Partner
Variable Interest Entities and Other Investments [Line Items]
Equity method investments	9,000,000.0	9,000,000.0
Variable Interest Entity, Not Primary Beneficiary | Other Assets
Variable Interest Entities and Other Investments [Line Items]
Investments in affordable Housing Project	$ 27,600,000	$ 28,200,000