Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill

	June 30,		June 30,
	2020		2019
	(Dollars in thousands)
Balance, beginning of year	$	808,322	$	808,726
Goodwill acquired during the year	92,844		—
Purchase accounting adjustments	—		(404)
Impairment losses	—		—
Balance, end of year	$	901,166	$	808,322
Accumulated impairment losses at end of year	$	—	$	—

Schedule of finite-lived intangible assets

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

	Three Months Ended						Six Months Ended
	June 30,		March 31,		June 30,		June 30,		June 30,
	2020		2020		2019		2020		2019
	(Dollars in thousands)
Gross amount of intangible assets:
Beginning balance	$	125,945	$	125,945	$	125,945	$	125,945	$	125,945
Additions due to acquisitions	19,267		—		—		19,267		—
Ending balance	145,212		125,945		125,945		145,212		125,945
Accumulated amortization:
Beginning balance	(46,596)		(42,633)		(29,824)		(42,633)		(25,388)
Amortization	(4,066)		(3,963)		(4,281)		(8,029)		(8,717)
Ending balance	(50,662)		(46,596)		(34,105)		(50,662)		(34,105)
Net intangible assets	$	94,550	$	79,349	$	91,840	$	94,550	$	91,840