Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest Income
Loans	$ 748	$ 713	$ 595
Investment securities	70	77	86
Interest-earning deposits and other	1	4	2
Total interest income	819	794	683
Interest Expense
Deposits	81	138	94
Short-term Federal Home Loan Bank advances and other	16	59	68
Long-term Federal Home Loan Bank advances	12	7	(4)
Other long-term debt	25	28	28
Total interest expense	134	232	186
Net interest income	685	562	497
Provision (benefit) for credit losses	149	18	(8)
Net interest income after provision (benefit) for credit losses	536	544	505
Noninterest Income
Net gain on loan sales	971	335	200
Loan fees and charges	165	100	87
Net return on mortgage servicing rights	10	6	36
Loan administration income	84	30	23
Deposit fees and charges	32	38	21
Other noninterest income	63	101	72
Total noninterest income	1,325	610	439
Noninterest Expense
Compensation and benefits	466	377	318
Occupancy and equipment	176	161	127
Commissions	232	111	80
Loan processing expense	98	80	59
Legal and professional expense	31	27	28
Federal insurance premiums	24	20	22
Intangible asset amortization	13	15	5
Other noninterest expense	117	97	73
Total noninterest expense	1,157	888	712
Income before income taxes	704	266	232
Provision for income taxes	166	48	45
Net income	$ 538	$ 218	$ 187
Net income per share
Basic (in usd per share)	$ 9.59	$ 3.85	$ 3.26
Diluted (in usd per share)	$ 9.52	$ 3.80	$ 3.21
Weighted average shares outstanding
Basic (in shares)	56,094,542	56,584,238	57,520,289
Diluted (in shares)	56,505,813	57,238,978	58,322,950