Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities
Net income		$ 366,122	$ 350,994	$ 306,771
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		32,998	(88,011)	174,006
Depreciation and amortization		45,088	46,508	50,567
Change in MSRs valuation(a)		(22,264)	(16,186)	17,704
Amortization of other intangible assets		8,811	8,844	10,192
Amortization and accretion on earning assets, funding, and other, net		14,980	15,088	25,028
Net amortization of tax credit investments		34,684	34,070	25,556
Losses (gains) on sales of investment securities, net		1,674	16	(9,222)
Asset (gains), net	[1]	(1,338)	(11,009)	(155,589)
(Gains) on sale of branches, net		0	(1,038)	(7,449)
(Gain) loss on mortgage banking activities, net		3,654	(39,106)	(59,379)
Mortgage loans originated and acquired for sale		(600,114)	(1,749,556)	(1,642,135)
Proceeds from sales of mortgage loans held for sale		715,035	1,774,791	1,959,571
(Increase) decrease in interest receivable		(63,921)	9,735	933
(Decrease) increase in interest payable		12,608	(10,675)	(11,385)
(Decrease) increase in expense payable		(5,297)	24,645	(29,057)
(Decrease) increase in net derivative position		269,774	120,418	(113,760)
Net change in other assets and other liabilities		34,072	60,025	7,666
Net cash provided by operating activities		846,566	529,551	550,020
Cash Flows from Investing Activities
Net decrease (increase) in loans		(4,579,431)	198,631	(1,640,524)
Purchases of
AFS securities		(959,977)	(2,744,244)	(1,648,938)
HTM securities		(301,052)	(622,485)	(125,480)
Federal Home Loan Bank and Federal Reserve Bank stocks and equity securities		(128,620)	(2,760)	(84,152)
Premises, equipment, and software, net of disposals		(62,711)	(52,281)	(54,682)
Other intangibles		0	0	(200)
Proceeds from
Proceeds from sales of investment securities		110,177	158,708	626,283
Sales of Federal Home Loan Bank and Federal Reserve Bank stocks and equity securities		528	35	144,000
Prepayments, calls, and maturities of AFS securities		494,197	1,216,657	1,343,056
Prepayments, calls, and maturities of HTM securities		196,605	299,761	449,078
Sales, prepayments, calls and maturities of other assets		33,795	29,833	27,964
Net change in tax credit and alternative investments		(58,323)	(68,455)	(55,134)
Net cash (paid) in acquisitions		0	0	(31,518)
Net cash (used in) investing activities		(5,254,811)	(1,584,186)	(793,737)
Cash Flows from Financing Activities
Net increase in deposits		1,169,983	2,015,423	2,497,378
Net decrease in deposits due to branch sales		0	(31,083)	(222,878)
Net increase (decrease) in short-term funding		251,674	101,946	(238,655)
Net increase (decrease) in short-term FHLB advances		3,125,000	0	(520,000)
Repayment of long-term FHLB advances		(413,558)	(18,437)	(1,040,972)
Proceeds from long-term FHLB advances		1,775	6,950	4,215
Repayment of senior notes		0	(300,000)	0
(Repayment) proceeds of finance lease principal		306	(965)	(1,081)
Proceeds from issuance of preferred stock		0	0	96,796
Proceeds from issuance of common stock for stock-based compensation plans		11,061	25,702	3,966
Redemption of preferred shares		0	(164,458)	0
Cash dividends on common stock		(123,137)	(116,061)	(112,023)
Cash dividends on preferred stock		(11,500)	(17,111)	(18,358)
payments for repurchase of common stock for tax withholding		938	0	0
Net cash provided by financing activities		4,004,185	1,364,102	371,020
Net increase (decrease) in cash and cash equivalents		(404,060)	309,467	127,304
Cash and cash equivalents at beginning of period		1,025,515	716,048	588,744
Restricted Cash		0	0	0
Supplemental disclosures of cash flow information
Cash paid for interest		174,675	81,604	159,291
Cash paid for income and franchise taxes		18,395	57,728	17,734
Loans and bank premises transferred to OREO		5,591	35,553	19,261
Capitalized mortgage servicing rights		7,279	16,151	13,667
Loans transferred into held for sale from portfolio, net		18	6,010	264,570
Transfer of AFS securities to HTM securities		1,621,990	0	0
Unsettled trades to purchase securities		0	4,459	0
Write-up of equity securities without readily determinable fair values		5,690	0	0
Fair value adjustments on hedged long-term FHLB advances and subordinated debt		16,163	0	0
Fair value adjustment on cash flow hedge		3,626	0	0
Acquisitions
Fair value of assets acquired, including cash and cash equivalents		0	0	456,480
Fair value ascribed to goodwill and intangible assets		0	0	23,548
Fair value of liabilities assumed		0	0	480,028
Fair Value, Measurements, Recurring [Member]
Supplemental disclosures of cash flow information
Fair value adjustment on cash flow hedge		3,360	0	0
ABRC [Member]
Proceeds from
Net cash received in business segment sale		0	2,415	256,511
Performance/Service Based RSAs, RSA, [Member]
Cash Flows from Financing Activities
Payments for Repurchase of Common Stock		6,480	4,847	6,113
Board Authorized Purchase Program [Member]
Cash Flows from Financing Activities
Payments for Repurchase of Common Stock		$ 0	$ 132,955	$ 71,255

[1] The year ended December 31, 2020 includes a gain of $163 million from the sale of ABRC. See Note 2 Acquisitions and Dispositions for additional details on the sale of ABRC. (b) Includes the deposit premium on the sale of branches net of miscellaneous costs to sell. See Note 2 Acquisitions and Dispositions for additional details on the branch sales. (c) Includes insurance commissions and fees, which were elevated prior to the sale of ABRC.