CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest income
Loans and lease financing	$ 496,523	$ 574,013	$ 529,877
Available-for-sale securities	81,808	92,505	107,123
Other	4,428	12,174	9,051
Total interest income	582,759	678,692	646,051
Interest expense
Deposits	35,471	87,865	72,976
Short-term and long-term borrowings	11,554	17,425	6,757
Total interest expense	47,025	105,290	79,733
Net interest income	535,734	573,402	566,318
Provision for credit losses	121,718	13,800	22,180
Net interest income (loss) after provision for credit losses	414,016	559,602	544,138
Noninterest income
Service charges on deposit accounts	28,169	33,778	32,036
Credit and debit card fees	55,451	66,749	65,716
Other service charges and fees	33,876	36,253	38,316
Trust and investment services income	35,652	35,102	31,324
Bank-owned life insurance	15,754	15,479	9,217
Investment securities losses, net	(114)	(2,715)
Other-than-temporary impairment (OTTI) losses on available-for-sale debt securities			(24,085)
Other	28,592	7,887	26,469
Total noninterest income	197,380	192,533	178,993
Noninterest expense
Salaries and employee benefits	174,221	173,098	167,162
Contracted services and professional fees	60,546	56,321	49,775
Occupancy	28,821	28,753	27,330
Equipment	20,277	17,343	17,714
Regulatory assessment and fees	8,659	7,390	14,217
Advertising and marketing	5,695	6,910	4,813
Card rewards program	22,114	29,961	24,860
Other	47,339	50,661	59,082
Total noninterest expense	367,672	370,437	364,953
Income (loss) before (provision) benefit for income taxes	243,724	381,698	358,178
Provision for income taxes	57,970	97,306	93,784
Net income (loss)	$ 185,754	$ 284,392	$ 264,394
Basic earnings per share (in dollars per share)	$ 1.43	$ 2.14	$ 1.93
Diluted earnings per share (in dollars per share)	$ 1.43	$ 2.13	$ 1.93
Basic weighted-average outstanding shares (in shares)	129,890,225	133,076,489	136,945,134
Diluted weighted-average outstanding shares (in shares)	130,220,077	133,387,157	137,111,420