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Premises and Equipment (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Premises and equipment |  |  |
Total | $ 843,960,000 | $ 819,265,000 |
Less accumulated depreciation | (324,763,000) | (298,630,000) |
Net premises and equipment | 519,197,000 | 520,635,000 |
Depreciation expense charged to operations | 28,200,000 | 29,400,000 | $ 29,200,000
2018-15 |  |  |
Premises and equipment |  |  |
Capitalized implementation costs related to internal use software | 0 |  |
Land |  |  |
Premises and equipment |  |  |
Total | 132,717,000 | 133,105,000 |
Buildings and leasehold improvements |  |  |
Premises and equipment |  |  |
Total | $ 401,989,000 | 395,360,000 |
Buildings and leasehold improvements | Minimum |  |  |
Premises and equipment |  |  |
Useful Life | 15 years |  |
Buildings and leasehold improvements | Maximum |  |  |
Premises and equipment |  |  |
Useful Life | 40 years |  |
Equipment and furnishings |  |  |
Premises and equipment |  |  |
Total | $ 201,153,000 | 178,676,000 |
Equipment and furnishings | Minimum |  |  |
Premises and equipment |  |  |
Useful Life | 3 years |  |
Equipment and furnishings | Maximum |  |  |
Premises and equipment |  |  |
Useful Life | 10 years |  |
Lease right of use assets |  |  |
Premises and equipment |  |  |
Total | $ 100,331,000 | 107,979,000 |
Construction in process |  |  |
Premises and equipment |  |  |
Total | $ 7,770,000 | 4,145,000 |
Computer software |  |  |
Premises and equipment |  |  |
Useful Life | 36 months |  |
Total | $ 24,600,000 | 23,200,000 |
Unamortized balance remaining | 4,300,000 | 7,800,000 |
Depreciation expense charged to operations | $ 4,900,000 | $ 4,900,000 | $ 4,800,000

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