(22) SEGMENT INFORMATION

The Company evaluates its performance with an internal profitability measurement system that measures the profitability of its business units on a pre-tax basis. The four principal business units are metropolitan banks, community banks, other financial services and executive, operations and support. Metropolitan and community banks offer traditional banking products such as commercial and retail lending, and a full line of deposit accounts. Metropolitan banks consist of banking locations in the metropolitan Oklahoma City and Tulsa areas. Community banks consist of banking locations in communities throughout Oklahoma. Other financial services are specialty product business units including guaranteed small business lending, residential mortgage lending, trust services, securities brokerage, electronic banking and insurance. The executive, operations and support groups represent executive management, operational support and corporate functions that are not allocated to the other business units.

The results of operations and selected financial information for the four business units are as follows:

	Metropolitan Banks		Community Banks		Other Financial Services		Executive, Operations & Support			Eliminations			Consolidated
	(Dollars in thousands)
December 31, 2017
Net interest income (expense)	$	74,274	$	147,731	$	5,770	$	(636	)	$	—		$	227,139
Provision for loan losses		2,457		4,442		1,767		(154	)		—			8,512
Noninterest income		15,698		54,353		37,842		97,368			(87,191	)		118,070
Depreciation and amortization		2,192		7,790		584		1,225			—			11,791
Other expenses		35,488		93,619		24,474		36,531			(1,511	)		188,601
Income before taxes	$	49,835	$	96,233	$	16,787	$	59,130		$	(85,680	)	$	136,305
Total assets	$	2,552,024	$	4,544,196	$	117,332	$	885,590		$	(845,986	)	$	7,253,156
Capital expenditures	$	3,606	$	12,334	$	64	$	2,003		$	—		$	18,007
December 31, 2016
Net interest income (expense)	$	63,519	$	135,508	$	6,132	$	(1,331	)	$	—		$	203,828
Provision for loan losses		2,229		7,509		1,653		128			—			11,519
Noninterest income		16,372		57,745		29,711		75,415			(72,211	)		107,032
Depreciation and amortization		2,341		8,281		510		1,251			—			12,383
Other expenses		34,130		96,627		22,216		26,375			(327	)		179,021
Income before taxes	$	41,191	$	80,836	$	11,464	$	46,330		$	(71,884	)	$	107,937
Total assets	$	2,493,096	$	4,412,174	$	83,594	$	803,810		$	(773,722	)	$	7,018,952
Capital expenditures	$	1,525	$	7,738	$	125	$	1,447		$	—		$	10,835
December 31, 2015
Net interest income (expense)	$	61,500	$	122,404	$	6,798	$	(1,910	)	$	—		$	188,792
Provision for loan losses		2,684		3,806		1,176		9			—			7,675
Noninterest income		16,552		52,598		33,629		72,806			(69,777	)		105,808
Depreciation and amortization		2,273		7,894		514		1,220			—			11,901
Other expenses		32,942		91,655		22,308		27,221			(312	)		173,814
Income before taxes	$	40,153	$	71,647	$	16,429	$	42,446		$	(69,465	)	$	101,210
Total assets	$	2,277,870	$	4,379,205	$	128,697	$	624,428		$	(717,371	)	$	6,692,829
Capital expenditures	$	3,743	$	4,634	$	121	$	2,765		$	—		$	11,263

The financial information for each business unit is presented on the basis used internally by management to evaluate performance and allocate resources. The Company utilizes a transfer pricing system to allocate the benefit or cost of funds provided or used by the various business units. Certain services provided by the support group to other business units, such as item processing, are allocated at rates approximating the cost of providing the services. Eliminations are adjustments to consolidate the business units and companies. Capital expenditures are generally charged to the business unit using the asset.