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Premises and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Premises and Equipment | PREMISES AND EQUIPMENT Major classifications of premises and equipment at December 31, 2020 and 2019 are summarized as follows:
(Dollars in thousands) | Useful Life ( years) |  | 2020 |  | 2019
Land | indefinite |  | $ | 336,258 |  |  | $ | 335,093 |
Premises and leasehold improvements | 3 - 40 |  | 1,286,092 |  |  | 1,228,588 |
Furniture, equipment and software | 3 - 10 |  | 639,109 |  |  | 595,686 |
Total |  |  | 2,261,459 |  |  | 2,159,367 |
Less accumulated depreciation and amortization |  |  | 1,010,176 |  |  | 914,971 |
Total premises and equipment |  |  | $ | 1,251,283 |  |  | $ | 1,244,396 |
Depreciation and amortization expense was $108.6 million, $103.8 million and $96.8 million for the years ended December 31, 2020, 2019 and 2018, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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