Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill

The following table summarizes the change in the balance of goodwill for the periods indicated below:

	Three Months Ended
	March 31,		December 31,		March 31,
(Dollars in thousands)	2022		2021		2021
Beginning balance	$	901,312	$	901,312	$	898,569
Purchase accounting adjustments	—		—		1,635
Ending balance	$	901,312	$	901,312	$	900,204
Accumulated impairment losses at end of period	$	—	$	—	$	—

Schedule of finite-lived intangible assets

The following table summarizes the change in the balance of core deposit intangibles and customer relationship intangibles, and the related accumulated amortization for the periods indicated below:

	Three Months Ended
	March 31,		December 31,		March 31,
(Dollars in thousands)	2022		2021		2021
Gross amount of intangible assets:
Beginning balance	$	145,212	$	145,212	$	145,212
Additions due to acquisitions	—		—		—
Ending balance	145,212		145,212		145,212
Accumulated amortization:
Beginning balance	(75,641)		(71,761)		(59,705)
Amortization	(3,593)		(3,880)		(4,143)
Ending balance	(79,234)		(75,641)		(63,848)
Net intangible assets	$	65,978	$	69,571	$	81,364