Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes in the carrying amount of goodwill

The carrying amounts of goodwill by operating segments for the six months ended June 30, 2017 were as follows:



	Community Banks		Insurance		Total
Balance at January 1, 2017	$	467,767	$	2,767	$	470,534
Addition to goodwill from acquisition	—		—		—
Adjustment to previously recorded goodwill	—		—		—
Balance at June 30, 2017	$	467,767	$	2,767	$	470,534

Summary of finite-lived intangible assets

The following table provides a summary of finite-lived intangible assets as of the dates presented:



	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
June 30, 2017
Core deposit intangibles	$	47,992	$	(28,178	)	$	19,814
Customer relationship intangible	1,970		(766		)	1,204
Total finite-lived intangible assets	$	49,962	$	(28,944	)	$	21,018
December 31, 2016
Core deposit intangibles	$	47,992	$	(25,188	)	$	22,804
Customer relationship intangible	1,970		(700		)	1,270
Total finite-lived intangible assets	$	49,962	$	(25,888	)	$	24,074

Schedule of current year amortization expense for finite-lived intangible assets

Current year amortization expense for finite-lived intangible assets is presented in the table below.



	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Amortization expense for:
Core deposit intangibles	$	1,460	$	1,709	$	2,990	$	3,373
Customer relationship intangible	33		33		66		66
Total intangible amortization	$	1,493	$	1,742	$	3,056	$	3,439

Schedule of estimated amortization expense of finite-lived intangible assets

The estimated amortization expense of finite-lived intangible assets for the year ending December 31, 2017 and the succeeding four years is summarized as follows:



	Core Deposit Intangibles		Customer Relationship Intangible		Total

2017	$	5,723	$	131	$	5,854
2018	4,881		131		5,012
2019	4,101		131		4,232
2020	3,213		131		3,344
2021	2,273		131		2,404