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Goodwill and Other Intangible Assets - Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Total | $ 114,460 | $ 127,340 |
Core deposit intangible |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 146,355 | 148,679 |
Accumulated amortization | (45,985) | (36,871) |
Total | 100,370 | 111,808 | $ 79,807
Books of Business Intangible |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 19,938 | 20,350 |
Accumulated amortization | (5,848) | (4,818) |
Total | $ 14,090 | $ 15,532 | $ 11,527

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