Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income
Loans and lease financing	$ 123,551	$ 109,266
Available-for-sale securities	28,993	26,429
Other	2,392	1,226
Total interest income	154,936	136,921
Interest expense
Deposits	15,264	7,570
Short-term borrowings and long-term debt		6
Total interest expense	15,264	7,576
Net interest income	139,672	129,345
Provision for loan and lease losses	5,950	4,500
Net interest income after provision for loan and lease losses	133,722	124,845
Noninterest income:
Service charges on deposit accounts	7,955	9,381
Credit and debit card fees	15,497	16,305
Other service charges and fees	9,342	9,097
Trust and investment services income	8,231	7,338
Bank-owned life insurance	2,044	4,578
Other	5,631	4,360
Total noninterest income	48,700	51,059
Noninterest expense
Salaries and employee benefits	42,160	40,408
Contracted services and professional fees	12,287	10,308
Occupancy	6,484	5,709
Equipment	4,588	4,197
Regulatory assessment and fees	3,973	3,774
Advertising and marketing	951	2,028
Card rewards program	5,718	5,775
Other	14,426	13,792
Total noninterest expense	90,587	85,991
Income before provision for income taxes	91,835	89,913
Provision for income taxes	23,877	33,173
Net income	$ 67,958	$ 56,740
Basic earnings per share (in dollars per share)	$ 0.49	$ 0.41
Diluted earnings per share (in dollars per share)	0.49	0.41
Dividends declared per share (in dollars per share)	$ 0.24	$ 0.22
Basic weighted-average outstanding shares (in shares)	139,600,712	139,545,728
Diluted weighted-average outstanding shares (in shares)	139,732,100	139,637,410