Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying amount of goodwill

Changes in the carrying amount of goodwill during the years ended December 31, 2017 and 2016 were as follows:

	Community Banks		Insurance		Total
Balance at December 31, 2015	$	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 December 31, 2016	$	467,767	$	2,767	$	470,534
Addition to goodwill from Metropolitan acquisition	140,512		—		140,512
Balance at December 31, 2017	$	608,279	$	2,767	$	611,046

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
December 31, 2017
Core deposit intangible	$	54,958	$	(31,586	)	$	23,372
Customer relationship intangible	1,970		(832		)	1,138
Total finite-lived intangible assets	$	56,928	$	(32,418	)	$	24,510
December 31, 2016
Core deposit intangible	$	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

Estimated amortization expense of finite-lived intangible assets for future periods

The estimated amortization expense of finite-lived intangible assets for the five succeeding fiscal years is summarized as follows:

	Core Deposit Intangibles		Customer Relationship Intangible		Total
2018	$	6,130	$	131	$	6,261
2019	5,212		131		5,343
2020	4,186		131		4,317
2021	3,107		131		3,238
2022	2,187		131		2,318