Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill and Intangible Assets

The following table sets forth activity for goodwill and other intangible assets for the period:

	Years Ended December 31,
	2016			2015			2014
	(in thousands)
Goodwill, beginning of period	$	382,762		$	382,537		$	343,952
Established through acquisitions and provisional period adjustments (1)	—			225			38,585
Total goodwill, end of period	382,762			382,762			382,537
Other intangible assets, net
Core deposit intangible:
Gross core deposit intangible balance, beginning of period	58,598			58,598			47,698
Accumulated amortization, beginning of period	(35,940		)	(29,058		)	(22,765		)
Core deposit intangible, net, beginning of period	22,658			29,540			24,933
Established through acquisitions	—			—			10,900
CDI current period amortization	(5,946		)	(6,882		)	(6,293		)
Total core deposit intangible, end of period	16,712			22,658			29,540
Intangible assets not subject to amortization	919			919			919
Other intangible assets, net at end of period	17,631			23,577			30,459
Total goodwill and intangible assets, end of period	$	400,393		$	406,339		$	412,996

Estimated Future Amortization Expense of Core Deposit Intangibles

The following table provides the estimated future amortization expense of core deposit intangibles for the succeeding five years:

Years Ending December 31,	(in thousands)
2017	$	4,913
2018	3,855
2019	2,951
2020	2,048
2021	1,440