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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table summarizes the changes in goodwill:
 
2014
 
2013
 
2012
 
(in thousands)
Balance at beginning of year
$
530,607

 
$
530,656

 
$
536,005

Sale of Global Exchange
—

 
—

 
(5,295
)
Other goodwill deductions
(14
)
 
(49
)
 
(54
)
Balance at end of year
$
530,593

 
$
530,607

 
$
530,656
Schedule of Finite-Lived Intangible Assets by Major Class
The following table summarizes intangible assets as of December 31:
 
2014
 
2013
 
Gross
 
Accumulated
Amortization
 
Net
 
Gross
 
Accumulated
Amortization
 
Net
 
(in thousands)
Amortizing:
 
 
 
 
 
 
 
 
 
 
 
Core deposit
$
50,279

 
$
(50,054
)
 
$
225

 
$
50,279

 
$
(48,839
)
 
$
1,440

Other
9,123

 
(9,101
)
 
22

 
9,123

 
(9,057
)
 
66

Total amortizing
59,402

 
(59,155
)
 
247

 
59,402

 
(57,896
)
 
1,506

Non-amortizing
963

 
—

 
963

 
1,263

 
(300
)
 
963

 
$
60,365

 
$
(59,155
)
 
$
1,210

 
$
60,665

 
$
(58,196
)
 
$
2,469