CONSOLIDATED INCOME STATEMENTS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest income:
Loans, including fees	$ 3,629.1	$ 3,409.7	$ 2,393.4
Investment securities	703.6	459.9	265.6
Dividends and other	208.4	165.7	32.8
Total interest income	4,541.1	4,035.3	2,691.8
Interest expense:
Deposits	1,600.2	1,142.6	276.4
Qualifying debt	38.0	37.9	35.0
Other borrowings	284.0	515.9	164.1
Total interest expense	1,922.2	1,696.4	475.5
Net interest income	2,618.9	2,338.9	2,216.3
Provision for credit losses	145.9	62.6	68.1
Net interest income after provision for credit losses	2,473.0	2,276.3	2,148.2
Non-interest income:
Service charges and loan fees	96.0	101.0	49.5
Net gain on loan origination and sale activities	206.3	193.5	104.0
Net loan servicing revenue	121.5	102.3	130.9
Income from equity investments	38.2	15.7	17.8
Income from bank owned life insurance	27.8	4.5	4.6
Gain (loss) on sales of investment securities	17.4	(40.8)	6.8
Fair value gain (loss) adjustments, net	7.5	(116.0)	(28.6)
Other income	28.5	20.5	39.6
Non-interest income (loss)	543.2	280.7	324.6
Non-interest expense:
Salaries and employee benefits	631.1	566.3	539.5
Deposit costs	693.2	436.7	165.8
Insurance	164.8	190.4	31.1
Data processing	149.7	122.0	83.0
Legal, professional, and directors' fees	109.4	107.2	99.9
Occupancy	73.1	65.6	55.5
Loan servicing expenses	68.1	58.8	55.5
Business development and marketing	32.7	21.8	22.1
Loan acquisition and origination expenses	21.5	20.4	23.1
Extinguishment of debt	0.0	(52.7)	0.0
Other non-interest expense (1)	81.4	86.9	81.2
Total non-interest expense	2,025.0	1,623.4	1,156.7
Income before provision for income taxes	991.2	933.6	1,316.1
Income tax expense	203.5	211.2	258.8
Net income	787.7	722.4	1,057.3
Dividends on preferred stock	12.8	12.8	12.8
Net income available to common stockholders	$ 774.9	$ 709.6	$ 1,044.5
Earnings per share:
Earnings per share, basic (dollars per share)	$ 7.14	$ 6.55	$ 9.74
Earnings per share, diluted (dollars per share)	$ 7.09	$ 6.54	$ 9.70
Weighted average number of common shares outstanding:
Weighted average number of common shares outstanding, basic (shares)	108.6	108.3	107.2
Weighted average number of common shares outstanding, diluted (shares)	109.3	108.5	107.6
Dividends declared per common share
Dividends declared per common share (dollars per share)	$ 1.49	$ 1.45	$ 1.42