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Premises and Equipment | 12 Months Ended
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Dec. 31, 2019
Premises and Equipment |
Premises and Equipment | Note 6—Premises and Equipment Premises and equipment consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | December 31, |
(Dollars in thousands) | ​ | Useful Life | ​ | 2019 | ​ | 2018 |
Land |  |  | ​ | ​ | ​ |  | $ | 74,913 |  | $ | 77,338 | ​
Buildings and leasehold improvements |  | 15 | - | 40 | years | ​ |  | 226,750 | ​ |  | 224,620 | ​
Equipment and furnishings |  | 3 | - | 10 | years | ​ |  | 106,696 | ​ | ​ | 109,468 | ​
Lease right of use assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 87,389 | ​ | ​ | — | ​
Construction in process | ​ | ​ | ​ | ​ | ​ | ​ |  | 1,977 | ​ |  | 3,782 | ​
Total | ​ | ​ | ​ | ​ | ​ | ​ |  | 497,725 | ​ |  | 415,208 | ​
Less accumulated depreciation | ​ | ​ | ​ | ​ | ​ | ​ |  | (180,404) | ​ |  | (174,132) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 317,321 | ​ | $ | 241,076 | ​
​ Depreciation expense charged to operations was $18.2 million, $18.7 million, and $15.2 million for the years ended December 31, 2019, 2018, and 2017, respectively. At December 31, 2019 and 2018, computer software with an original cost of $13.7 million and $13.5 million, respectively, were being amortized using the straight-line method over thirty-six months. Amortization expense totaled $1.2 million, $2.1 million, and $2.5 million for the years ended December 31, 2019, 2018, and 2017, respectively. There were $1.3 million in capitalized implementation costs in 2019 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. Of this amount, $1.1 million was related to a new commercial loan platform and $171,000 was related to a front capture software product for administering customer banking transactions at branch locations. These costs are being held in a suspense account classified as other assets on the balance sheet until the project is complete when they will then begin to be depreciated. See Note 20 – Lease Commitments for further details on lease right of use asset.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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