Goodwill and Core Deposit Intangibles (Tables)

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table presents goodwill as of the dates indicated:

	June 30, 2019			December 31, 2018
Net carrying value at beginning of the period	$	546.7		$	444.7
Addition to provisional goodwill from acquisition	77.2			100.8
Measurement period adjustment to previously recorded goodwill	(0.4		)	1.2
Net carrying value at end of period	$	623.5		$	546.7

Schedule of Core Deposit Intangibles

The following table presents Core deposit intangibles (“CDI”) as of the dates indicated:

	June 30, 2019			December 31, 2018
Gross CDI, at beginning of the period	$	89.7		$	74.0
Established through acquisitions or provisional adjustments	16.6			15.7
Reductions due to sale of accounts	(0.3		)	—
Accumulated amortization	(38.1		)	(32.8		)
Net CDI, end of period	$	67.9		$	56.9

Schedule of Future Amortization Expense

The following table provides the estimated future CDI amortization expense:

Years Ending December 31,
2019 remaining	$	5.9
2020	10.8
2021	9.9
2022	9.0
2023	8.2
Thereafter	24.1
Total	$	67.9