Premises and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

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.