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Premises and Equipment | 12 Months Ended
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Dec. 31, 2023
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 | ​ | 2023 | ​ | 2022 |
Land |  |  | ​ | ​ | ​ |  | $ | 132,717 |  | $ | 133,105 | ​
Buildings and leasehold improvements |  | 15 | - | 40 | years | ​ |  | 401,989 | ​ |  | 395,360 | ​
Equipment and furnishings |  | 3 | - | 10 | years | ​ |  | 201,153 | ​ | ​ | 178,676 | ​
Lease right of use assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 100,331 | ​ | ​ | 107,979 | ​
Construction in process | ​ | ​ | ​ | ​ | ​ | ​ |  | 7,770 | ​ |  | 4,145 | ​
Total | ​ | ​ | ​ | ​ | ​ | ​ |  | 843,960 | ​ |  | 819,265 | ​
Less accumulated depreciation | ​ | ​ | ​ | ​ | ​ | ​ |  | (324,763) | ​ |  | (298,630) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 519,197 | ​ | $ | 520,635 | ​
​ Depreciation expense charged to operations was $28.2 million, $29.4 million, and $29.2 million for the years ended December 31, 2023, 2022, and 2021, respectively. ​ At December 31, 2023 and 2022, computer software with an original cost of $24.6 million and $23.2 million, respectively, were being amortized using the straight-line method over thirty-six months. The unamortized balance remaining of the original computer software cost was $4.3 and $7.8, respectively, at December 31, 2023 and 2022. Amortization expense totaled $4.9 million, $4.9 million, and $4.8 million for the years ended December 31, 2023, 2022, and 2021, respectively. There were no capitalized implementation costs in 2023 related to internal use software. ​ See Note 21—Lease Commitments for further details on lease right of use assets.

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