XML 82 R69.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Goodwill and Core Deposit Intangibles - Schedule of Future Estimated CDI Amortization Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Apr. 08, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 10 years    
Core Deposits Intangibles      
Finite-Lived Intangible Assets [Line Items]      
2020 $ 10.9    
2021 9.9    
2022 9.0    
2023 8.2    
2024 7.3    
Thereafter 16.8    
Total $ 62.1 $ 3.0 $ 56.9