Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table summarizes the changes in goodwill:

	2012			2011		2010
	(in thousands)
Balance at beginning of year	$	536,005		$	535,518	$	534,862
Sale of Global Exchange	(5,295		)	—		—
Other goodwill additions, net	(54		)	487		656
Balance at end of year	$	530,656		$	536,005	$	535,518

Schedule of Finite-Lived Intangible Assets by Major Class

The following table summarizes intangible assets as of December 31:

	2012							2011
	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
	(in thousands)
Amortizing:
Core deposit	$	50,279	$	(46,766	)	$	3,513	$	50,279	$	(44,134	)	$	6,145
Other	9,123		(8,992		)	131		11,403		(10,607		)	796
Total amortizing	59,402		(55,758		)	3,644		61,682		(54,741		)	6,941
Non-amortizing	1,263		—			1,263		1,263		—			1,263
	$	60,665	$	(55,758	)	$	4,907	$	62,945	$	(54,741	)	$	8,204

Schedule of Expected Amortization Expense

Core deposit intangible assets are amortized using an accelerated method over the estimated remaining life of the acquired core deposits. As of December 31, 2012, these assets had a weighted average remaining life of approximately three years. Other amortizing intangible assets, consisting primarily of premiums paid on branch acquisitions in prior years that did not qualify for business combinations accounting under FASB ASC Topic 810, had a weighted average remaining life of two years. Amortization expense related to intangible assets totaled $3.0 million, $4.3 million and $5.2 million in 2012, 2011 and 2010, respectively.

Future amortization expense is expected to be as follows (in thousands):

Year
2013	$	2,138
2014	1,259
2015	247
Total	$	3,644