GOODWILL AND INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Change in the Carrying Value of Goodwill

The change in the carrying value of goodwill for the years ended December 31, 2017 and 2016 is summarized below.

	December 31,
(dollars in thousands)	2017		2016
Carrying amount of goodwill at beginning of year	$	125,532	$	90,082
Additions related to acquisitions in current year	—		35,485
Fair value adjustments related to acquisitions in prior year	—		(35		)
Carrying amount of goodwill at end of year	$	125,532	$	125,532

Summary of Information Related to Acquired Intangible Assets

Following is a summary of information related to acquired intangible assets:

	As of December 31, 2017				As of December 31, 2016
(dollars in thousands)	Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
Amortized intangible assets - core deposit premiums	$	26,250	$	12,754	$	26,250	$	8,822

Estimated Amortization Expense

The estimated amortization expense for each of the next five years is as follows (in thousands):

2018	$	3,697
2019	3,622
2020	2,915
2021	1,691
2022	653
Thereafter	918
	$	13,496