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Premises and Equipment
 12 Months Ended
Dec. 31, 2017
Premises and Equipment  
Premises and Equipment

Note 7—Premises and Equipment

Premises and equipment consisted of the following:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31,

 

(Dollars in thousands)

 

Useful Life

 

2017

 

2016

 

Land

    

    

 

 

 

    

$

81,291

    

$

56,454

 

Buildings and leasehold improvements

 

15

-

40

years

 

 

227,402

 

 

157,927

 

Equipment and furnishings

 

 3

-

10

years

 

 

104,319

 

 

78,800

 

Construction in process

 

 

 

 

 

 

 

2,305

 

 

3,613

 

Total

 

 

 

 

 

 

 

415,317

 

 

296,794

 

Less accumulated depreciation

 

 

 

 

 

 

 

(159,752)

 

 

(113,284)

 

 

 

 

 

 

 

 

$

255,565

 

$

183,510

 

 

Depreciation expense charged to operations was $15.2 million, $11.5 million, and $11.1 million for the years ended December 31, 2017, 2016, and 2015, respectively.

At December 31, 2017 and 2016, computer software with an original cost of $13.0 million and $9.7 million, respectively, were being amortized using the straight‑line method over thirty-six months. Amortization expense totaled $2.5 million, $2.3 million, and $1.8 million for the years ended December 31, 2017, 2016, and 2015, respectively.