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Other Assets - Software, Net (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Other Assets. |  |  |
Software, net included in other assets | $ 13.3 | $ 15.2 |
Amortization of software expenses, recorded in other noninterest expense | $ 8.6 | $ 6.4 | $ 4.3

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