Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest income
Loans and lease financing	$ 109,266	$ 104,357
Available-for-sale securities	26,429	16,559
Other	1,226	2,896
Total interest income	136,921	123,812
Interest expense
Deposits	7,570	6,429
Short-term borrowings and long-term debt	6	71
Total interest expense	7,576	6,500
Net interest income	129,345	117,312
Provision for loan and lease losses	4,500	700
Net interest income after provision for loan and lease losses	124,845	116,612
Noninterest income
Service charges on deposit accounts	9,555	9,789
Credit and debit card fees	14,479	13,819
Other service charges and fees	9,097	9,227
Trust and investment services income	7,338	7,405
Bank-owned life insurance	4,578	2,356
Net (gains) on investment securities		25,728
Other	4,360	5,195
Total noninterest income	49,407	73,519
Noninterest expense:
Salaries and employee benefits	43,300	44,701
Contracted services and professional fees	10,308	12,755
Occupancy	5,321	5,312
Equipment	4,197	3,827
Regulatory assessment and fees	3,774	2,477
Advertising and marketing	2,028	1,624
Card rewards program	4,511	3,502
Other	10,900	10,866
Total noninterest expense	84,339	85,064
Income before provision for income taxes	89,913	105,067
Provision for income taxes	33,173	39,536
Net income	$ 56,740	$ 65,531
Basic earnings per share (in dollars per share)	$ 0.41	$ 0.47
Diluted earnings per share (in dollars per share)	0.41	$ 0.47
Dividends declared per share (in dollars per share)	$ 0.22
Basic weighted-average outstanding shares (in shares)	139,545,728	139,459,620
Diluted weighted-average outstanding shares (in shares)	139,637,410	139,459,620