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Premises and Equipment | 12 Months Ended
--- | ---
Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Premises and Equipment | Premises and Equipment Premises and equipment are described as follows:
| Estimated Useful Life |  | 2017 |  | 2016
| (dollars in thousands)
Land | Indefinite |  | $ | 15,389 |  |  | $ | 13,679 |
Buildings and improvements | 10-50 years |  | 88,386 |  |  | 80,364 |
Leasehold improvements | 5-40 years |  | 17,812 |  |  | 15,871 |
Furniture and equipment | 3-7 years |  | 64,609 |  |  | 61,324 |
Software | 3-7 years |  | 37,434 |  |  | 36,077 |
Subtotal |  |  | 223,630 |  |  | 207,315 |
Less accumulated depreciation and amortization |  |  | 142,291 |  |  | 139,781 |
Total premises and equipment |  |  | $ | 81,339 |  |  | $ | 67,534 |
Depreciation related to premises and equipment included in noninterest expense for the years ended December 31, 2017, 2016 and 2015 amounted to $9.0 million, $7.5 million and $7.2 million, respectively. First Commonwealth leases various premises and assorted equipment under non-cancellable agreements. Total future minimal rental commitments at December 31, 2017, were as follows:
| Premises |  | Equipment
| (dollars in thousands)
2018 | $ | 4,459 |  |  | $ | 136 |
2019 | 4,106 |  |  | 78 |
2020 | 3,348 |  |  | 15 |
2021 | 2,929 |  |  | 5 |
2022 | 2,646 |  |  | — |
Thereafter | 12,851 |  |  | — |
Total | $ | 30,339 |  |  | $ | 234 |
Included in the lease commitments above is $141 thousand in lease payments to be paid under a sale-leaseback arrangement. The sale-leaseback transaction occurred in 2005 and resulted in a gain of $297 thousand on the sale of a branch that is being recognized over the 15 year lease term through 2020. Increases in utilities and taxes that may be passed on to the lessee under the terms of various lease agreements are not reflected in the above table. However, certain lease agreements provide for increases in rental payments based upon historical increases in the consumer price index or the lessor’s cost of operating the facility, and are included in the minimum lease commitments. Additionally, the table above includes rent expense that is recognized for rent holidays and during construction periods. Total lease expense amounted to $2.7 million, $3.7 million and $2.9 million in 2017, 2016 and 2015, 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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