Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
INTEREST INCOME:
Loans and leases	$ 1,525	$ 1,542	$ 1,553
Securities and money market investments	164	166	252
Total interest income	1,689	1,708	1,805
INTEREST EXPENSE:
Interest-bearing checking and money market accounts	31	57	174
Savings accounts	28	32	36
Certificates of deposit	55	217	320
Borrowed funds	286	302	318
Total interest expense	400	608	848
Net interest income	1,289	1,100	957
Provision for credit losses	3	62	7
Net interest income after provision for credit loan losses	1,286	1,038	950
NON-INTEREST INCOME:
Fee income	23	22	29
Bank-owned life insurance	29	32	28
Net gain on securities		1	8
Other	9	6	19
Total non-interest income	61	61	84
Operating expenses:
Compensation and benefits	303	301	302
Occupancy and equipment	88	86	89
General and administrative	127	124	120
Total operating expenses	518	511	511
Merger-related expenses	23
Total non-interest expense	541	511	511
Income before income taxes	806	588	523
Income tax expense	210	77	128
Net income	596	511	395
Preferred stock dividends	33	33	33
Net income available to common shareholders	$ 563	$ 478	$ 362
Basic earnings per common share	$ 1.20	$ 1.02	$ 0.77
Diluted earnings per common share	$ 1.20	$ 1.02	$ 0.77
Net income	$ 596	$ 511	$ 395
Other comprehensive income (loss), net of tax:
Change in net unrealized gain (loss) on securities available for sale, net of tax of $42; $(16); and $(18), respectively	(112)	42	46
Change in pension and post-retirement obligations, net of tax of $x; $2 and $(2)	6	(5)	5
Change in net unrealized (loss) gain on cash flow hedges, net of tax of $(2); $16 and $-, respectively	23	(42)	1
Less: Reclassification adjustment for sales of available-for-sale securities, net of tax of $-; $-; and $2, respectively		(1)	(4)
Reclassification adjustment for defined benefit pension plan, net of tax of $(2); $(2) and $(2), respectively	5	5	7
Reclassification adjustment for net gain on cash flow hedges included in net income, net of tax $(7); $(3) and $-, respectively	18	8
Total other comprehensive income (loss), net of tax	(60)	7	55
Total comprehensive income, net of tax	$ 536	$ 518	$ 450