Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 205,148	$ 213,611
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	13,508	(9,600)
Depreciation and amortization of premises and equipment	22,627	20,647
Net amortization of investment securities premiums	9,823	11,816
Investment securities (gains) losses, net	26	(33,511)
Gain on sales of mortgage loans held for sale	(7,974)	(20,038)
Proceeds from sales of mortgage loans held for sale	400,797	818,432
Originations of mortgage loans held for sale	(371,466)	(757,631)
Intangible amortization	1,043	443
Amortization of issuance costs and discounts on long-term borrowings	551	1,608
Debt extinguishment costs	0	32,575
Stock-based compensation	10,166	6,192
Change in deferred federal income tax	(148,952)	(11,079)
Change in life insurance cash surrender value	(90,234)	(12,802)
Other changes, net	474,156	61,509
Total adjustments	314,071	108,561
Net cash (used in) provided by operating activities	519,219	322,172
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of AFS securities	196,407	125,811
Proceeds from principal repayments and maturities of AFS securities	546,770	366,788
Proceeds from principal repayments and maturities of HTM securities	90,044	89,349
Purchase of AFS securities	(822,216)	(901,400)
Purchase of HTM securities	(30,959)	(310,699)
Sale of Visa Shares	0	33,962
(Increase) decrease of FRB and FHLB stock	(24,279)	30,836
Net (increase) decrease in loans	(819,164)	620,583
Net purchases of premises and equipment	(10,023)	(17,346)
Net cash paid for acquisition	(21,796)	292
Net change in tax credit investments	(33,178)	(12,439)
Net cash (used in) provided by investing activities	(928,394)	25,737
CASH FLOWS FROM FINANCING ACTIVITIES:
Net (decrease) increase in demand and savings deposits	(420,622)	1,743,512
Net (decrease) increase in time deposits	(308,503)	(508,678)
Net (decrease) increase from other borrowings	183,518	(160,479)
Repayments of senior debt and subordinated debt	(81,496)	(703,681)
Net proceeds from issuance of common stock	4,792	4,682
Dividends paid	(78,413)	(73,962)
Acquisition of treasury stock	0	(26,126)
Net cash (used in) provided by financing activities	(700,724)	275,268
Net (decrease) increase in Cash and Cash Equivalents	(1,109,899)	623,177
Cash and Cash Equivalents at Beginning of Period	1,638,614	1,847,832
Cash and Cash Equivalents at End of Period	528,715	2,471,009
Cash paid during the period for:
Interest	42,529	52,733
Income taxes	22,416	8,329
Supplemental Schedule of Certain Noncash Activities:
Transfer of AFS securities to HTM securities	$ 479,008	$ 376,165