Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income
Loans and lease financing	$ 529,877	$ 462,675	$ 428,419
Available-for-sale securities	107,123	102,272	83,019
Other	9,051	5,821	7,082
Total interest income	646,051	570,768	518,520
Interest expense
Deposits	72,976	41,944	26,650
Short-term and long-term borrowings	6,757	20	198
Total interest expense	79,733	41,964	26,848
Net interest income	566,318	528,804	491,672
Provision for loan and lease losses	22,180	18,500	8,600
Net interest income after provision for loan and lease losses	544,138	510,304	483,072
Noninterest income:
Service charges on deposit accounts	32,036	35,807	37,392
Credit and debit card fees	65,716	64,049	65,262
Other service charges and fees	38,316	34,063	35,355
Trust and investment services income	31,324	30,485	29,440
Bank-owned life insurance	9,217	13,283	15,021
Investment securities gains, net			27,277
Other-than-temporary impairment (OTTI) losses on available-for-sale debt securities	(24,085)
Other	26,469	27,918	16,290
Total noninterest income	178,993	205,605	226,037
Noninterest expense:
Salaries and employee benefits	167,162	163,086	157,144
Contracted services and professional fees	49,775	45,011	45,345
Occupancy	27,330	23,485	21,606
Equipment	17,714	17,247	16,912
Regulatory assessment and fees	14,217	14,907	12,972
Advertising and marketing	4,813	6,191	6,127
Card rewards program	24,860	23,363	22,459
Other	59,082	54,264	54,715
Total noninterest expense	364,953	347,554	337,280
Income (loss) before (provision) benefit for income taxes	358,178	368,355	371,829
Provision for income taxes	93,784	184,673	141,651
Net income (loss)	$ 264,394	$ 183,682	$ 230,178
Basic earnings per share (in dollars per share)	$ 1.93	$ 1.32	$ 1.65
Diluted earnings per share (in dollars per share)	1.93	1.32	1.65
Dividends declared per share (in dollars per share)	$ 0.96	$ 0.88	$ 0.62
Basic weighted-average outstanding shares (in shares)	136,945,134	139,560,305	139,487,762
Diluted weighted-average outstanding shares (in shares)	137,111,420	139,656,993	139,492,608