Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2018

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 for the three and nine months ended September 30, 2018 and 2017:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(dollars in thousands)	2018		2017		2018		2017
Balance at beginning of period	$	828,804	$	655,018	$	828,051	$	655,018
Acquisition adjustments		-		-		753		-
Balance at end of period	$	828,804	$	655,018	$	828,804	$	655,018

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

The gross carrying amount and accumulated amortization of other intangible assets at September 30, 2018 and December 31, 2017 were as follows:

	Gross		Accumulated			Net
	Carrying		Amortization			Carrying
(dollars in thousands)	Amount		and Impairment			Amount
September 30, 2018
Core deposit	$	90,083	$	(53,765	)	$	36,318
Customer trust relationships		16,547		(10,731	)		5,816
Total intangible assets	$	106,630	$	(64,496	)	$	42,134
December 31, 2017
Core deposit	$	108,923	$	(62,874	)	$	46,049
Customer trust relationships		16,547		(9,533	)		7,014
Customer loan relationships		4,413		(4,380	)		33
Total intangible assets	$	129,883	$	(76,787	)	$	53,096

Schedule of Estimated Amortization Expense for Future Years

Estimated amortization expense for future years is as follows:

(dollars in thousands)
2018 remaining	$	3,116
2019		11,010
2020		8,672
2021		6,417
2022		4,595
Thereafter		8,324
Total	$	42,134