Premises and Equipment

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Premises and Equipment

Premises and Equipment

See Note 1 for the Corporation’s accounting policy for premises and equipment. A summary of premises and equipment at December 31 was as follows.

		2016						2015
	Estimated Useful Lives	Cost		Accumulated Depreciation		Net Book Value		Net Book Value
		($ in Thousands)
Land	—	$	57,471	$	—	$	57,471	$	52,104
Land improvements	3 – 15 years	12,572		5,929		6,643		6,661
Buildings	5 – 39 years	332,256		130,104		202,152		141,432
Computers	3 – 5 years	42,190		33,139		9,051		6,372
Furniture, fixtures and other equipment	3 – 15 years	162,253		119,704		42,549		49,794
Leasehold improvements	3 – 15 years	34,959		22,510		12,449		11,243
Total premises and equipment		$	641,701	$	311,386	$	330,315	$	267,606

Depreciation and amortization of premises and equipment totaled $32 million in 2016, $33 million in 2015, and $34 million in 2014.

The Corporation and certain subsidiaries are obligated under noncancelable operating leases for other facilities and equipment, certain of which provide for increased rentals based upon increases in cost of living adjustments and other operating costs. The approximate minimum annual rentals and commitments under these noncancelable agreements and leases with remaining terms in excess of one year are as follows.

	($ in Thousands)
2017	$	9,711
2018	9,665
2019	9,115
2020	8,133
2021	7,336
Thereafter	20,940
Total	$	64,900

Total rental expense under leases, net of lease income, totaled $8 million in 2016, $13 million in 2015, and $11 million in 2014, respectively. The reduction of rental expense in 2016 was mainly driven by $4 million of leasing income generated by the Milwaukee Center (which was purchased in April 2016).