Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 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 periods indicated:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
	(in thousands)
Goodwill
Goodwill at beginning of period (1)	$	382,537		$	343,952		$	382,537		$	343,952
Provisional period adjustments (1)	225			—			225			—
Total goodwill (1)	382,762			343,952			382,762			343,952
Other intangible assets, net
Core deposit intangible:
Gross core deposit intangible balance at beginning of period (1)	58,598			47,698			58,598			47,698
Accumulated amortization at beginning of period	(32,593		)	(25,825		)	(29,058		)	(22,765		)
Core deposit intangible, net at beginning of period	26,005			21,873			29,540			24,933
CDI current period amortization	(1,695		)	(1,456		)	(5,230		)	(4,516		)
Total core deposit intangible, net at end of period	24,310			20,417			24,310			20,417
Intangible assets not subject to amortization	919			919			919			919
Other intangible assets, net at end of period	25,229			21,336			25,229			21,336
Total goodwill and other intangible assets at end of period	$	407,991		$	365,288		$	407,991		$	365,288

Estimated Future Amortization Expense of Core Deposit Intangibles

The following table provides the estimated future amortization expense of core deposit intangibles for the remaining three months ending December 31, 2015 and the succeeding four years:

	Amount
	(in thousands)
Year ending December 31,
2015	$	1,653
2016	5,945
2017	4,913
2018	3,855
2019	2,951