Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill and Intangible Assets

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

	Years Ended December 31,
	2012			2011			2010
	(in thousands)
Total goodwill, beginning of period	$	115,554		$	109,639		$	95,519
Established through acquisitions	—			5,915			14,120
Total goodwill, end of period	115,554			115,554			109,639
Gross core deposit intangible balance, beginning of period	32,441			26,652			8,896
Accumulated amortization, beginning of period	(12,275		)	(7,956		)	(4,033		)
Core deposit intangible, net, beginning of period	20,166			18,696			4,863
Established through acquisitions	—			5,789			17,755
CDI current period amortization	(4,445		)	(4,319		)	(3,922		)
Total core deposit intangible, end of period	15,721			20,166			18,696
Total goodwill and intangible assets, end of period	$	131,275		$	135,720		$	128,335

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)
2013	$	3,964
2014	3,397
2015	2,645
2016	2,184
2017	1,627