CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 115,710	$ 87,268
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	13,848	14,734
Stock-based compensation	5,465	3,684
Provision for credit losses	8,656	34,683
Net amortization of premiums and accretion of discounts on securities and borrowings	8,293	6,685
Amortization of other intangible assets	6,006	5,470
Losses on securities transactions, net	118	40
Proceeds from sales of loans held for sale	357,108	168,392
Gains on sales of loans, net	(3,513)	(4,550)
Originations of loans held for sale	(287,765)	(147,981)
Losses (gains) on sales of assets, net	196	(121)
Net change in:
Cash surrender value of bank owned life insurance	(2,331)	(3,142)
Accrued interest receivable	(1,560)	(1,716)
Other assets	204,729	(401,849)
Accrued expenses and other liabilities	(111,562)	122,426
Net cash provided by (used in) operating activities	313,398	(115,977)
Cash flows from investing activities:
Net loan originations and purchases	(475,142)	(667,555)
Equity securities:
Purchases	(1,878)	(5,214)
Sales	319	0
Held to maturity debt securities:
Purchases	(407,793)	(103,192)
Maturities, calls and principal repayments	184,163	118,541
Available for sale debt securities:
Purchases	0	(238,488)
Sales	41,134	0
Maturities, calls and principal repayments	164,235	88,688
Death benefit proceeds from bank owned life insurance	1,628	1,184
Proceeds from sales of real estate property and equipment	1,742	6,352
Proceeds from sales of loans held for investment	0	30,020
Purchases of real estate property and equipment	(8,042)	(9,235)
Net cash used in investing activities	(499,634)	(778,899)
Cash flows from financing activities:
Net change in deposits	649,607	(200,035)
Net change in short-term borrowings	(63,292)	1,002,375
Proceeds from issuance of long-term borrowings, net	0	725,242
Repayments of long-term borrowings	(51,769)	(42,128)
Cash dividends paid to preferred shareholders	(3,172)	(3,172)
Cash dividends paid to common shareholders	(45,526)	(44,682)
Purchase of common shares to treasury	(542)	(2,094)
Common stock issued, net	5,723	(1,358)
Other, net	(165)	(130)
Net cash provided by financing activities	490,864	1,434,018
Net change in cash and cash equivalents	304,628	539,142
Cash and cash equivalents at beginning of year	1,329,205	434,687
Cash and cash equivalents at end of period	1,633,833	973,829
Supplemental disclosures of cash flow information:
Interest on deposits and borrowings	37,997	104,797
Federal and state income taxes	5,855	4,215
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	141	2,750
Transfer of loans to loans held for sale	0	30,020
Lease right of use assets obtained in exchange for operating lease liabilities	$ 21	$ 3,121