Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 2016 were as follows:

	Community Banks		Insurance		Total
Balance at January 1, 2016	$	443,104	$	2,767	$	445,871
Addition to goodwill from Heritage acquisition	3,554		—		3,554
Adjustment to previously recorded goodwill	—		—		—
Balance at March 31, 2016	$	446,658	$	2,767	$	449,425

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
March 31, 2016
Core deposit intangible	$	45,982	$	(20,236	)	$	25,746
Customer relationship intangible	1,970		(602		)	1,368
Total finite-lived intangible assets	$	47,952	$	(20,838	)	$	27,114
December 31, 2015
Core deposit intangible	$	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 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	$	6,327	$	131	$	6,458
2017	5,372		131		$	5,503
2018	4,570		131		$	4,701
2019	3,830		131		$	3,961
2020	2,982		131		$	3,113