Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
INTEREST INCOME
Interest and fees on loans and leases	$ 258,747	$ 229,488
Interest and dividends on investment securities:
Taxable	19,956	15,699
Exempt from federal income tax	2,114	2,128
Dividends	517	468
Interest on temporary investments and interest bearing deposits	925	1,164
Total interest income	282,259	248,947
INTEREST EXPENSE
Interest on deposits	34,094	15,610
Interest on securities sold under agreement to repurchase and federal funds purchased	810	63
Interest on term debt	3,683	3,361
Interest on junior subordinated debentures	5,987	4,932
Total interest expense	44,574	23,966
Net interest income	237,685	224,981
PROVISION FOR LOAN AND LEASE LOSSES	13,684	13,656
Net interest income after provision for loan and lease losses	224,001	211,325
NON-INTEREST INCOME
Residential mortgage banking revenue, net	11,231	38,438
Unrealized holding gains on equity securities	695	0
Gain on loan sales, net	769	1,230
BOLI income	2,168	2,070
Total non-interest income	45,740	78,567
NON-INTEREST EXPENSE
Salaries and employee benefits	100,658	106,551
Occupancy and equipment, net	36,245	38,661
Communications	4,220	4,433
Marketing	2,726	1,800
Services	12,210	15,061
FDIC assessments	2,942	4,480
Gain on other real estate owned, net	(51)	(38)
Intangible amortization	1,404	1,541
Other expenses	11,238	13,624
Total non-interest expense	171,592	186,113
Income before provision for income taxes	98,149	103,779
Provision for income taxes	24,116	24,807
Net income	$ 74,033	$ 78,972
Earnings per common share:
Basic (in usd per share)	$ 0.34	$ 0.36
Diluted (in usd per share)	$ 0.34	$ 0.36
Weighted average number of common shares outstanding:
Basic (in shares)	220,366	220,370
Diluted (in shares)	220,655	220,825
Total service charges on deposits
NON-INTEREST INCOME
Revenue from contract with customer	$ 15,278	$ 14,995
Investment Advisory, Management and Administrative Service [Member]
NON-INTEREST INCOME
Revenue from contract with customer	3,810	4,194
Other income
NON-INTEREST INCOME
Revenue from contract with customer	$ 11,789	$ 17,640