Goodwill and Acquired Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

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

	For the Year Ended December 31,
(In thousands)	2019		2018		2017
Beginning of year	$	204,753	$	147,578	$	64,649
Changes from business combinations	533		57,175		82,929
Total	$	205,286	$	204,753	$	147,578

Acquired intangible assets consist of core deposit intangibles

The change in balance for CDI is as follows:

	For the Year Ended December 31,
(In thousands)	2019			2018			2017
Beginning of year	$	24,807		$	18,937		$	14,572
Acquired CDI, including measurement period adjustments	(676		)	10,170			7,726
Amortization expense	(5,826		)	(4,300		)	(3,361		)
End of year	$	18,305		$	24,807		$	18,937
(In months)
Remaining average amortization period for CDI	47			58			63

Gross Carrying Amount and Accumulated Amortization of Intangible Asset

The gross carrying amount and accumulated amortization of the Company's CDI subject to amortization as of:

	December 31, 2019					December 31, 2018
(In thousands)	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Deposit base	$	36,015	$	(17,710	)	$	36,691	$	(11,884	)