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Premises and Equipment | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Premises and Equipment | PREMISES AND EQUIPMENT Major classifications of premises and equipment at December 31, 2018 and 2017 are summarized as follows:
(Dollars in thousands) | Useful Life ( years) |  | 2018 |  | 2017
Land | indefinite |  | $ | 306,734 |  |  | $ | 290,990 |
Premises and leasehold improvements | 3 - 40 |  | 1,228,582 |  |  | 1,158,699 |
Furniture and equipment | 3 - 10 |  | 560,923 |  |  | 489,067 |
Total |  |  | 2,096,239 |  |  | 1,938,756 |
Less accumulated depreciation and amortization |  |  | 892,060 |  |  | 800,325 |
Total premises and equipment |  |  | $ | 1,204,179 |  |  | $ | 1,138,431 |
Depreciation and amortization expense was $96.8 million, $90.8 million and $88.8 million for the years ended December 31, 2018, 2017 and 2016, respectively. BancShares leases certain premises and equipment under various lease agreements that provide for payment of property taxes, insurance and maintenance costs. Operating leases frequently provide for one or more renewal options either on the same basis as current rental terms or increased rents with cost of living escalation clauses, while others can also include purchase options. Future minimum rental commitments for noncancellable operating leases with initial or remaining terms of one or more years consisted of the following at December 31, 2018:
(Dollars in thousands) | Year ended December 31
2019 | $ | 18,058 |
2020 | 16,377 |
2021 | 14,564 |
2022 | 12,381 |
2023 | 10,434 |
Thereafter | 38,494 |
Total minimum payments | $ | 110,308 |
Total rent expense for all operating leases amounted to $15.5 million in 2018, $15.2 million in 2017 and $13.0 million in 2016, net of rent income, which was $7.8 million, $6.6 million and $6.5 million during 2018, 2017 and 2016, respectively.

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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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