Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes in the carrying amount of goodwill

Changes in the carrying amount of goodwill during the nine months ended September 30, 2016 were as follows:



	Community Banks		Insurance		Total
Balance at January 1, 2016	$	443,104	$	2,767	$	445,871
Addition to goodwill from KeyWorth acquisition	20,633		—		20,633
Adjustment to previously recorded goodwill	4,030		—		4,030
Balance at September 30, 2016	$	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
September 30, 2016
Core deposit intangibles	$	47,992	$	(23,595	)	$	24,397
Customer relationship intangible	1,970		(668		)	1,302
Total finite-lived intangible assets	$	49,962	$	(24,263	)	$	25,699
December 31, 2015
Core deposit intangibles	$	45,982	$	(18,572	)	$	27,410
Customer relationship intangible	1,970		(569		)	1,401
Total finite-lived intangible assets	$	47,952	$	(19,141	)	$	28,811

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				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
Amortization expense for:
Core deposit intangibles	$	1,651	$	1,770	$	5,024	$	4,218
Customer relationship intangible	33		33		99		99
Total intangible amortization	$	1,684	$	1,803	$	5,123	$	4,317

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, 2016 and the succeeding four years is summarized as follows:



	Core Deposit Intangibles		Customer Relationship Intangible		Total

2016	$	6,616	$	131	$	6,747
2017	5,722		131		$	5,853
2018	4,881		131		$	5,012
2019	4,101		131		$	4,232
2020	3,213		131		$	3,344