Quarterly Financial Summary (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Summary of Quarterly Financial Information

The following is a summary of quarterly financial information for the years ended December 31, 2017 and 2016:

	2017 Quarters									2016 Quarters
(In thousands, except per share data)	First			Second		Third		Fourth		First		Second		Third		Fourth
Interest income	$	215,759		231,181		247,688		251,840		$	192,231	197,064		208,149		215,013
Interest expense	23,179			26,772		31,700		32,741		20,722		21,794		23,513		24,235
Net interest income	192,580			204,409		215,988		219,099		171,509		175,270		184,636		190,778
Provision for credit losses	5,209			8,891		7,896		7,772		8,034		9,129		9,571		7,350
Net interest income after provision for credit losses	187,371			195,518		208,092		211,327		163,475		166,141		175,065		183,428
Non-interest income, excluding net securities gains (losses)	68,820			89,925		79,692		81,024		67,427		83,359		83,299		83,700
(Losses) gains on investment securities, net	(55		)	47		39		14		1,325		1,440		3,305		1,575
Non-interest expense	168,118			183,544		183,575		196,580		153,730		170,969		176,615		180,371
Income before taxes	88,018			101,946		104,248		95,785		78,497		79,971		85,054		88,332
Income tax expense	29,640			37,049		38,622		27,004		29,386		29,930		31,939		33,724
Net income	$	58,378		64,897		65,626		68,781		$	49,111	50,041		53,115		54,608
Preferred stock dividends	3,628			2,050		2,050		2,050		3,628		3,628		3,628		3,629
Net income applicable to common shares	$	54,750		62,847		63,576		66,731		$	45,483	46,413		49,487		50,979
Net income per common share:
Basic	$	1.05		$	1.15	$	1.14	$	1.19	$	0.94	$	0.94	$	0.96	$	0.98
Diluted	1.00			1.11		1.12		1.17		0.90		0.90		0.92		0.94
Cash dividends declared per common share	0.14			0.14		0.14		0.14		0.12		0.12		0.12		0.12