Other Intangible Assets and Goodwill (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Core deposit intangibles

The following table sets forth information regarding the Company’s core deposit intangibles:

	At or for the Years ended
(Dollars in thousands)	December 31, 2016			December 31, 2015		December 31, 2014
Gross carrying value	$	34,742		38,527		32,056
Accumulated amortization	(22,395		)	(23,972	)	(21,156	)
Net carrying value	$	12,347		14,555		10,900
Aggregate amortization expense	$	2,970		2,964		2,811
Weighted-average amortization period	9.6 years
Estimated amortization expense for the years ending December 31,
2017	$	2,161
2018	1,718
2019	1,618
2020	1,557
2021	1,497

Changes in the carrying value of goodwill

The following table discloses the changes in the carrying value of goodwill:

	Years ended
(Dollars in thousands)	December 31, 2016		December 31, 2015	December 31, 2014
Net carrying value at beginning of period	$	140,638	129,706	129,706
Acquisitions	6,415		10,932	—
Net carrying value at end of period	$	147,053	140,638	129,706

Gross carrying value of goodwill and the accumulated impairment charge

The gross carrying value of goodwill and the accumulated impairment charge consists of the following:

(Dollars in thousands)	December 31, 2016			December 31, 2015
Gross carrying value	$	187,212		180,797
Accumulated impairment charge 1	(40,159		)	(40,159	)
Net carrying value	$	147,053		140,638

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¹ A goodwill impairment charge was recognized in 2011 and was due to high levels of volatility and dislocation in bank stock prices nationwide.