Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 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 March 31,
(dollars in thousands)	2020		2019
Balance at beginning of period	$	1,036,994	$	1,036,258
Acquisitions and adjustments	—		—
Balance at end of period	$	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
March 31, 2020
Core deposit	$	119,051	$	(66,488)	$	52,563
Customer trust relationships	16,547		(12,781)		3,766
Total intangible assets	$	135,598	$	(79,269)	$	56,329
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	$	10,315
2021	11,336
2022	9,014
2023	7,053
2024	5,645
Thereafter	12,966
Total	$	56,329