CONSOLIDATED STATEMENT 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	$ 1,128,083	$ 872,981	$ 567,797
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (reversal of) credit losses	73,500	(35,000)	210,653
Depreciation and amortization	159,851	156,792	119,908
Accretion of discount and (amortization of premiums), net	56,703	67,415	17,704
Stock compensation costs	37,601	32,567	29,237
Deferred income (benefit) tax expense	(43,988)	4,762	(41,515)
Net gains on sales of loans	(6,411)	(8,909)	(4,501)
Gains on sales of AFS debt securities	(1,306)	(1,568)	(12,299)
Net gains on sales of other real estate owned ("OREO") and other foreclosed assets	(3,042)	(1,977)	(207)
Impairment on OREO and other foreclosed assets	6,861	5,151	3,717
Loans held-for-sale:
Originations and purchases	(447)	(11,155)	(81,662)
Proceeds from sales and paydowns/payoffs of loans originally classified as held-for-sale	461	12,552	80,659
Proceeds from distributions received from equity method investees	7,586	13,117	8,786
Net change in accrued interest receivable and other assets	187,512	124,496	(340,566)
Net change in accrued expenses and other liabilities	461,385	(63,360)	136,260
Other net operating activities	1,673	558	(1,327)
Total adjustments	937,939	295,441	124,847
Net cash provided by operating activities	2,066,022	1,168,422	692,644
Net (increase) decrease in:
Investments in qualified affordable housing partnerships, tax credit and other investments	(167,303)	(189,836)	(154,887)
Interest-bearing deposits with banks	596,994	73,263	(613,400)
Resale agreements:
Proceeds from paydowns and maturities	1,951,388	982,694	450,000
Purchases	(390,077)	(1,876,197)	(800,000)
AFS debt securities:
Proceeds from sales	129,181	308,812	525,433
Proceeds from repayments, maturities and redemptions	896,726	1,766,184	2,070,131
Purchases	(1,070,608)	(6,779,655)	(4,758,254)
HTM debt securities:
Proceeds from repayments, maturities and redemptions	75,635	0	0
Purchases	(50,000)	0	0
Loans held-for-investment:
Proceeds from sales of loans originally classified as held-for-investment	602,725	606,410	331,864
Purchases	(657,620)	(1,045,456)	(389,863)
Other changes in loans held-for-investment, net	(6,516,182)	(2,877,438)	(3,546,596)
Proceeds from sales of OREO and other foreclosed assets	6,482	54,338	295
Purchase of bank-owned life insurance	(734)	(150,000)	0
Distributions received from equity method investees	18,221	14,440	15,901
Other net investing activities	(7,720)	(4,763)	(4,360)
Net cash (used in) provided by investing activities	(4,582,892)	(9,117,204)	(6,873,736)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	2,709,427	8,464,285	7,482,845
Net (decrease) increase in short-term borrowings	6	(21,143)	(9,016)
FHLB advances:
Proceeds	4,950,200	400	10,300
Repayments	(5,200,200)	(405,400)	(105,300)
Repurchase agreements:
Proceeds	0	0	48,063
Repayment	0	0	(198,063)
Extinguishment cost	0	0	(8,740)
Long-term debt and lease liabilities:
Proceeds from long-term debt	0	0	1,437,269
Repayments of long-term debt and lease liabilities	(943)	(1,206)	(1,438,335)
Common stock:
Proceeds from issuance pursuant to various stock compensation plans and agreements	3,178	2,573	2,326
Stocks tendered for payment of withholding taxes	(19,087)	(15,702)	(8,253)
Repurchase of common stocks pursuant to the Stock Repurchase Program	(99,990)	0	(145,966)
Cash dividends paid	(228,381)	(188,762)	(158,222)
Net cash provided by financing activities	2,114,210	7,835,045	6,908,908
Effect of exchange rate changes on cash and cash equivalents	(28,491)	8,701	29,006
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(431,151)	(105,036)	756,822
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	3,912,935	4,017,971	3,261,149
CASH AND CASH EQUIVALENTS, END OF YEAR	3,481,784	3,912,935	4,017,971
Cash paid during the year for:
Interest	249,587	87,684	233,139
Income taxes, net	281,269	139,460	116,416
Noncash investing and financing activities:
Loans transferred from held-for-investment to held-for-sale	623,777	599,610	329,069
Securities transferred from AFS to HTM debt securities	3,010,003	0	0
Loans transferred to OREO	$ 270	$ 49,485	$ 19,504