Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amount of Goodwill

The following table shows the changes in the carrying amount of goodwill:

	Three Months Ended June 30,				Six Months Ended June 30,
(dollars in thousands)	2020		2019		2020		2019
Balance at beginning of period	$	1,036,994	$	1,036,258	$	1,036,994	$	1,036,258
Acquisitions and adjustments	—		—		—		—
Balance at end of period	$	1,036,994	$	1,036,258	$	1,036,994	$	1,036,258

Schedule of Gross Carrying Amounts and Accumulated Amortization of Other Intangible Assets

The gross carrying amount and accumulated amortization of other intangible assets were as follows: 

(dollars in thousands)	Gross Carrying Amount		Accumulated Amortization and Impairment		Net Carrying Amount
June 30, 2020
Core deposit	$	116,185	$	(66,935)	$	49,250
Customer trust relationships	16,547		(13,080)		3,467
Total intangible assets	$	132,732	$	(80,015)	$	52,717
December 31, 2019
Core deposit	$	119,051	$	(63,020)	$	56,031
Customer trust relationships	16,547		(12,473)		4,074
Total intangible assets	$	135,598	$	(75,493)	$	60,105

Schedule of Estimated Amortization Expense for Future Years

Estimated amortization expense for future years is as follows:

(dollars in thousands)
2020 remaining	$	6,703
2021	11,336
2022	9,014
2023	7,053
2024	5,645
Thereafter	12,966
Total	$	52,717