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Premises and Equipment
 12 Months Ended
Dec. 31, 2021
Premises and Equipment  
Premises and Equipment

Note 7—Premises and Equipment

Premises and equipment consisted of the following:

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December 31,

 

(Dollars in thousands)

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Useful Life

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2021

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2020

 

Land

    

    

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$

145,276

    

$

152,263

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Buildings and leasehold improvements

 

15

-

40

years

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404,655

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406,078

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Equipment and furnishings

 

3

-

10

years

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169,271

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161,009

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Lease right of use assets

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110,311

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113,422

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Construction in process

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14,518

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3,618

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Total

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844,031

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836,390

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Less accumulated depreciation

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(285,532)

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(257,151)

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$

558,499

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$

579,239

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Depreciation expense charged to operations was $29.2 million, $25.3 million, and $18.2 million for the years ended December 31, 2021, 2020, and 2019, respectively.

At December 31, 2021 and 2020, computer software with an original cost of $43.5 million and $37.4 million, respectively, were being amortized using the straight-line method over thirty-six months. Amortization expense totaled $4.8 million, $2.4 million, and $1.2 million for the years ended December 31, 2021, 2020, and 2019, respectively. There were no capitalized implementation costs in 2021 related to internal use software following the guidance of ASU No. 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.

See Note 21—Lease Commitments for further details on lease right of use asset.