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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 |  |

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