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Basis of Presentation - Pro Forma Information (Details) - 5 Arches LLC and CoreVest - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2019
Business Acquisition [Line Items] |  |
Net interest income | $ 45,702 | $ 133,446
Non-interest income | 38,177 | 116,649
Net income | $ 46,609 | $ 140,790

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