Our supplemental consolidated financial information for each three month period in 2017 and 2016 are as follows:



	Three months ended
(Dollars in thousands, except per share amounts)	March 31,			June 30,			September 30,			December 31,
2017:
Interest income	$	320,926		$	353,927		$	385,271		$	405,016
Interest expense	10,933			11,231			11,297			11,310
Net interest income	309,993			342,696			373,974			393,706
Provision for credit losses	30,734			15,806			23,522			22,242
Noninterest income	117,659			128,528			158,778			152,266
Noninterest expense	237,633			251,246			257,761			264,015
Income before income tax expense	159,285			204,172			251,469			259,715
Income tax expense (1)	51,405			71,656			97,351			135,051
Net income before noncontrolling interests	107,880			132,516			154,118			124,664
Net income attributable to noncontrolling interests	(6,397		)	(9,323		)	(5,498		)	(7,454		)
Net income available to common stockholders (1)	$	101,483		$	123,193		$	148,620		$	117,210
Earnings per common share—basic (1)	$	1.94		$	2.34		$	2.82		$	2.22
Earnings per common share—diluted (1)	1.91			2.32			2.79			2.19

2016:
Interest income	$	291,658		$	293,992		$	300,413		$	307,333
Interest expense	10,237			10,656			11,252			10,728
Net interest income	281,421			283,336			289,161			296,605
Provision for credit losses (2)	33,475			36,746			20,004			16,454
Noninterest income	86,134			112,776			144,140			113,502
Noninterest expense (2)	203,899			199,939			220,773			235,186
Income before income tax expense	130,181			159,427			192,524			158,467
Income tax expense	53,584			65,047			76,877			54,825
Net income before noncontrolling interests	76,597			94,380			115,647			103,642
Net loss (income) attributable to noncontrolling interests	2,577			(1,416		)	(4,566		)	(4,176		)
Net income available to common stockholders	$	79,174		$	92,964		$	111,081		$	99,466
Earnings per common share—basic	$	1.53		$	1.79		$	2.13		$	1.91
Earnings per common share—diluted	1.52			1.78			2.12			1.89