Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
Cash Flows from Operating Activities:
Net income		$ 321,445	$ 293,869
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		51,192	5,403
Depreciation		18,482	20,471
Amortization of discounts and premiums, net		11,117	3,690
Net gain on sales of securities		(1,137)	(7,755)
Gain on trading activity		(23)	(66)
Net loss on sales of loans		2	43
Stock-based compensation		24,613	23,937
Deferred tax expense		95,367	41,655
Changes in operating assets and liabilities:
Increase in other assets	[1]	(164,303)	(30,826)
Increase (decrease) in other liabilities	[2]	2,502	(11,527)
Purchases of securities held for trading		(15,000)	(42,500)
Proceeds from sales of securities held for trading		15,023	42,566
Held for sale originations		(119,158)
Net cash provided by operating activities		240,122	338,960
Cash Flows from Investing Activities:
Proceeds from repayment of securities available for sale		1,594,862	1,579,297
Proceeds from sales of securities available for sale		483,872	363,621
Purchase of securities available for sale		(1,472,702)	(2,103,973)
Redemption of Federal Home Loan Bank stock		144,066	114,097
Purchases of Federal Home Loan Bank stock		(193,987)	(75,878)
Proceeds from (purchases of) bank-owned life insurance, net		8,195	(29,332)
Proceeds from sales of loans		3,124	91,074
Purchases of loans		(51,451)	(20,206)
Other changes in loans, net		(896,021)	(765,013)
Dispositions (purchases) of premises and equipment, net		4,356	(646)
Net cash used in investing activities		(375,686)	(846,959)
Cash Flows from Financing Activities:
Net increase in deposits		47,809	807,746
Net increase in short-term borrowed funds		1,575,000
Proceeds from long-term borrowed funds		4,625,000	3,285,812
Repayments of long-term borrowed funds		(5,075,000)	(3,868,000)
Cash dividends paid on common stock		(236,851)	(238,043)
Cash dividends paid on preferred stock		(24,621)	(24,621)
Treasury stock repurchased		(50,190)	(67,125)
Payments relating to treasury shares received for restricted stock award tax payments		(8,812)	(8,047)
Net cash provided by (used in ) financing activities		852,335	(112,278)
Net increase (decrease) in cash, cash equivalents, and restricted cash		716,771	(620,277)
Cash, cash equivalents, and restricted cash at beginning of period		741,870	1,474,955
Cash, cash equivalents, and restricted cash at end of period		1,458,641	854,678
Supplemental information:
Cash paid for interest		518,511	622,027
Cash paid for income taxes		17,459	75,280
Non-cash investing and financing activities:
Transfers to repossessed assets from loans		120	3,027
Operating lease liabilities arising from obtaining right-of-use assets as of January 1, 2019			324,360
Securitization of residential mortgage loans to mortgage-backed securities available for sale		41,871	20,206
Transfer of loans from held for investment to held for sale			91,117
Dispositions of premises and equipment			1,245
Shares issued for restricted stock awards		$ 22,198	$ 16,501

[1] Includes $15.4 million and $23.8 million of amortization of operating lease right-of-use assets for the nine months ended September 30, 2020 and 2019, respectively.

[2] Includes $15.4 million and $23.8 million of amortization of operating lease liability for the nine months ended September 30, 2020 and 2019, respectively.