Premises, Equipment, and Leases (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Summary of Premises and Equipment

Premises and equipment on December 31 are summarized below:

(Dollars in thousands)	2017		2016
Land	$	104,454	$	59,343
Buildings	472,619		340,593
Leasehold improvements	26,640		26,956
Furniture, fixtures, and equipment	194,057		180,157
Fixed assets held-for-sale (a)	53,195		5,832
Premises and equipment, at cost	850,965		612,881
Less accumulated depreciation and amortization	318,714		323,496
Premises and equipment, net	$	532,251	$	289,385

Certain previously reported amounts have been reclassified to agree with current presentation.

(a) Primarily comprised of land and buildings.

Minimum Future Lease Payments for Noncancelable Operating Leases on Premises and Equipment

Minimum future lease payments for noncancelable operating leases, primarily on premises, on December 31, 2017 are shown below. Aggregate minimum income under sublease agreements for these periods is not material.

(Dollars in thousands)
2018	$	29,862
2019	27,602
2020	25,242
2021	21,987
2022	17,028
2023 and after	59,069
Total minimum lease payments	$	180,790

Rent Expense Incurred Under All Operating Lease Obligations

Rent expense incurred under all operating lease obligations for the years ended December 31 is as follows:

(Dollars in thousands)	2017			2016			2015
Rent expense, gross	$	23,116		$	20,812		$	18,166
Sublease income	(631		)	(477		)	(5		)
Rent expense, net	$	22,485		$	20,335		$	18,161