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Premises and Equipment
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Premises and Equipment Disclosure [Text Block]
Premises and Equipment

Premises and equipment at December 31 are summarized as follows (in thousands):

 
 
December 31,
 
 
2016
 
2015
Land
 
$
70,552

 
$
72,612

Buildings and improvements
 
250,311

 
225,181

Software
 
158,155

 
142,476

Furniture and equipment
 
217,399

 
194,715

Construction in progress
 
36,743

 
39,886

Premises and equipment
 
733,160

 
674,870

Less accumulated depreciation
 
407,311

 
368,380

Premises and equipment, net of accumulated depreciation
 
$
325,849

 
$
306,490



Depreciation expense of premises and equipment was $40 million, $34 million and $33 million for the years ended December 31, 2016, 2015 and 2014, respectively.