CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 358,802	$ 285,243
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	40,799	43,975
Stock-based compensation	15,852	12,001
Provision for credit losses	20,934	106,747
Net amortization of premiums and accretion of discounts on securities and borrowings	22,145	26,051
Amortization of other intangible assets	16,753	18,528
(Gains) losses on securities transactions, net	(1,263)	127
Proceeds from sales of loans held for sale	932,274	716,739
Gains on sales of loans, net	(20,016)	(26,253)
Originations of loans held for sale	(774,443)	(829,252)
Gains on sales of assets, net	(380)	(716)
Loss on extinguishment of debt	8,406	2,353
Net change in:
Trading debt securities	(4,797)	0
Cash surrender value of bank owned life insurance	(6,824)	(7,661)
Accrued interest receivable	8,157	(30,421)
Other assets	97,341	(420,572)
Accrued expenses and other liabilities	(130,698)	83,591
Net cash provided by (used in) operating activities	583,042	(19,520)
Cash flows from investing activities:
Net loan originations and purchases	(405,204)	(2,686,137)
Equity securities:
Purchases	(3,163)	(7,616)
Sales	1,227	27,867
Held to maturity debt securities:
Purchases	(1,062,202)	(381,606)
Maturities, calls and principal repayments	633,272	532,151
Available for sale debt securities:
Purchases	(367,866)	(306,071)
Sales	91,978	0
Maturities, calls and principal repayments	376,875	374,321
Death benefit proceeds from bank owned life insurance	3,850	14,062
Proceeds from sales of real estate property and equipment	4,982	16,136
Proceeds from sales of loans held for investment	4,498	30,020
Purchases of real estate property and equipment	(19,805)	(20,715)
Net cash used in investing activities	(741,558)	(2,407,588)
Cash flows from financing activities:
Net change in deposits	1,697,003	2,002,145
Net change in short-term borrowings	(364,612)	337,446
Proceeds from issuance of long-term borrowings, net	295,922	838,388
Repayments of long-term borrowings	(1,168,465)	(108,446)
Cash dividends paid to preferred shareholders	(9,516)	(9,516)
Cash dividends paid to common shareholders	(134,860)	(133,536)
Purchase of common shares to treasury	(699)	(4,972)
Common stock issued, net	15,199	2,074
Other, net	(505)	(451)
Net cash provided by financing activities	329,467	2,923,132
Net change in cash and cash equivalents	170,951	496,024
Cash and cash equivalents at beginning of year	1,329,205	434,687
Cash and cash equivalents at end of period	1,500,156	930,711
Supplemental disclosures of cash flow information:
Interest on deposits and borrowings	109,661	229,987
Federal and state income taxes	148,674	108,302
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	141	3,716
Transfer of loans to loans held for sale	0	30,020
Lease right of use assets obtained in exchange for operating lease liabilities	$ 40,296	$ 10,141