Summary of Significant Accounting Policies - Narrative (Details)		3 Months Ended	9 Months Ended
	Jul. 02, 2019 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) market	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounting Policies [Abstract]
Number of markets entity operates | market			12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adopting ASC 326			$ 38,102,000
Off-Balance Sheet, Credit Loss, Liability			$ 21,200,000	$ 8,800,000	$ 2,400,000
Bankers Healthcare Group, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)			49.00%
Advocate Capital, Inc. [Member]
Business Acquisition [Line Items]
Acquisition, cash price	$ 59,000,000.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets	45,600,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	$ 134,300,000
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle		$ 31,800,000
Impact of adopting ASC 326			$ 34,300,000
Off-Balance Sheet, Credit Loss, Liability				8,800,000
Deferred Taxes Recorded due to Cumulative Change in Accounting Principle				$ 11,300,000
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase			$ 3,800,000