CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest income:
Loans, including fees	$ 1,488,800	$ 1,144,300	$ 1,093,000
Investment securities	158,600	107,800	111,900
Dividends and other	11,300	9,700	20,100
Total interest income	1,658,700	1,261,800	1,225,000
Interest expense:
Deposits	47,500	70,400	158,400
Qualifying debt	33,100	23,900	23,400
Other borrowings	29,300	600	2,800
Total interest expense	109,900	94,900	184,600
Net interest income	1,548,800	1,166,900	1,040,400
(Recovery of) provision for credit losses	(21,400)	(123,600)	(19,300)
Net interest income after provision for (recovery of) credit losses	1,570,200	1,043,300	1,021,100
Non-interest income:
Service charges and fees	28,300	23,300	23,300
Income from equity investments	22,100	12,700	8,300
Fair value (loss) gain on assets measured at fair value, net	(1,300)	3,800	5,100
Other income	12,300	16,100	9,200
Total non-interest income	404,200	70,800	65,100
Non-interest expense:
Salaries and employee benefits	466,700	303,600	279,300
Legal, professional, and directors' fees	58,600	42,200	37,000
Occupancy	43,800	34,100	32,600
Deposit costs	29,800	18,500	31,700
Data processing	58,200	35,700	30,600
Insurance	23,000	13,300	11,900
Business development and marketing	13,500	9,600	11,200
Gain (Loss) on Extinguishment of Debt	5,900	0	0
Net (gain) loss on sales and valuations of repossessed and other assets	(3,500)	(1,500)	3,800
Other expense	57,800	36,100	43,900
Total non-interest expense	851,400	491,600	482,000
Income before provision for income taxes	1,123,000	622,500	604,200
Income tax expense	223,800	115,900	105,000
Net income	899,200	506,600	499,200
Preferred Stock Dividends, Income Statement Impact	3,500	0	0
Net income available to common stockholders	$ 895,700	$ 506,600	$ 499,200
Earnings per share:
Basic	$ 8.72	$ 5.06	$ 4.86
Diluted	$ 8.67	$ 5.04	$ 4.84
Weighted average number of common shares outstanding:
Basic	102,700	100,200	102,700
Diluted	103,300	100,500	103,100
Net gain on loan origination and sale activities	$ 326,200	$ 0	$ 0
Commercial banking related income	17,400	14,700	16,100
Gain on sales of investment securities	8,300	200	3,100
Gain on recovery from credit guarantees	7,200	0	0
Loan servicing fees, net	(16,300)	0	0
Expense Related to Distribution or Servicing and Underwriting Fees	53,500	0	0
Loan Processing Fee	28,800	0	0
Acquisition and restructure expenses	$ 15,300	$ 0	$ 0