Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

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,
	2015			2014			2013
	(in thousands)
Goodwill, beginning of period	$	382,537		$	343,952		$	115,554
Established through acquisitions and provisional period adjustments (1)	225			38,585			228,398
Total goodwill, end of period	382,762			382,537			343,952
Other intangible assets, net
Core deposit intangible:
Gross core deposit intangible balance, beginning of period	58,598			47,698			32,441
Accumulated amortization, beginning of period	(29,058		)	(22,765		)	(16,720		)
Core deposit intangible, net, beginning of period	29,540			24,933			15,721
Established through acquisitions	—			10,900			15,257
CDI current period amortization	(6,882		)	(6,293		)	(6,045		)
Total core deposit intangible, end of period	22,658			29,540			24,933
Intangible assets not subject to amortization	919			919			919
Other intangible assets, net at end of period	23,577			30,459			25,852
Total goodwill and intangible assets, end of period	$	406,339		$	412,996		$	369,804

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)
2016	$	5,945
2017	4,913
2018	3,855
2019	2,951
2020	2,048