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Premises and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 07, 2020
Premises and equipment |  |  |  |
Total | $ 844,031 | $ 836,390 |  |
Less accumulated depreciation | (285,532) | (257,151) |  |
Net premises and equipment | 558,499 | 579,239 |  |
Depreciation expense charged to operations | 29,200 | 25,300 | $ 18,200 |
2018-15 |  |  |  |
Premises and equipment |  |  |  |
Capitalized implementation costs related to internal use software | 0 |  |  |
CSFL |  |  |  |
Premises and equipment |  |  |  |
Premises and equipment |  |  |  | $ 313,435
Land |  |  |  |
Premises and equipment |  |  |  |
Total | 145,276 | 152,263 |  |
Buildings and leasehold improvements |  |  |  |
Premises and equipment |  |  |  |
Total | $ 404,655 | 406,078 |  |
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 | $ 169,271 | 161,009 |  |
Equipment and furnishings | Minimum |  |  |  |
Premises and equipment |  |  |  |
Useful Life | 3 years |  |  |
Equipment and furnishings | Maximum |  |  |  |
Premises and equipment |  |  |  |
Useful Life | 10 years |  |  |
Construction in process |  |  |  |
Premises and equipment |  |  |  |
Total | $ 14,518 | 3,618 |  |
Computer software |  |  |  |
Premises and equipment |  |  |  |
Useful Life | 36 months |  |  |
Total | $ 43,500 | 37,400 |  |
Depreciation expense charged to operations | 4,800 | 2,400 | $ 1,200 |
Lease right of use assets |  |  |  |
Premises and equipment |  |  |  |
Total | $ 110,311 | $ 113,422 |  |

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