Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest Income:
Loans and leases	$ 376	$ 380	$ 1,145	$ 1,154
Securities and money market investments	39	38	124	128
Total interest income	415	418	1,269	1,282
Interest Expense:
Interest-bearing checking and money market accounts	8	9	24	48
Savings accounts	7	8	20	25
Certificates of deposit	11	44	43	189
Borrowed funds	71	75	215	228
Total interest expense	97	136	302	490
Net interest income	318	282	967	792
(Recovery of) provision for credit losses	(1)	13	(1)	51
Net interest income after (recovery of) provision for credit losses	319	269	968	741
Non-Interest Income:
Fee income	6	5	17	16
Bank-owned life insurance	7	7	22	24
Net gain on securities	0	0	0	1
Other	2	2	6	5
Total non-interest income	15	14	45	46
Operating expenses:
Compensation and benefits	77	74	229	229
Occupancy and equipment	22	24	65	63
General and administrative	30	31	96	86
Total operating expenses	129	129	390	378
Merger-related expenses	6	0	16	0
Total non-interest expense	135	129	406	378
Income before income taxes	199	154	607	409
Income tax expense	50	38	161	88
Net income	149	116	446	321
Preferred stock dividends	9	9	25	25
Net income available to common shareholders	$ 140	$ 107	$ 421	$ 296
Basic earnings per common share	$ 0.30	$ 0.23	$ 0.90	$ 0.63
Diluted earnings per common share	$ 0.30	$ 0.23	$ 0.90	$ 0.63
Net income	$ 149	$ 116	$ 446	$ 321
Other comprehensive gain (loss), net of tax:
Change in net unrealized gain (loss) on securities available for sale, net of tax of $9; $0; $34 and ($16) respectively	(23)	1	(89)	43
Change in pension and post-retirement obligations, net of tax of $0; $0; ($1) and $0, respectively	1	0	3	0
Change in net unrealized gain (loss) on cash flow hedges, net of tax of $0; $1; $0 and $16, respectively	(2)	(1)	1	(43)
Less: Reclassification adjustment for sales of available-for-sale securities, net of tax of $0; $0; $0 and $0, respectively	0	0	0	0
Reclassification adjustment for defined benefit pension plan, net of tax of $0; $0; ($1) and ($1), respectively	1	1	4	4
Reclassification adjustment for net gain on cash flow hedges included in net income, net of tax of ($2); ($1); ($4) and ($2), respectively	6	4	14	4
Total other comprehensive gain (loss), net of tax	(17)	5	(67)	8
Total comprehensive income, net of tax	$ 132	$ 121	$ 379	$ 329