Goodwill and Core Deposit Intangibles (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Change in Carrying Amount of Goodwill

Schedule of Activity of Identifiable Core Deposit Intangibles

Year Ended December 31,	2021		2020
Gross CDI, beginning of period	$	106.0	$	106.0
Accumulated amortization	(64.7)		(54.8)
Net CDI, end of period	$	41.3	$	51.2

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The following table provides estimated future CDI amortization expense:

Years ending December 31,
2022	$	9.0
2023	8.2
2024	7.3
2025	6.5
2026	5.9
Thereafter	4.4
Total	$	41.3