CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Assets [Abstract]
Cash and noninterest-bearing due from banks	$ 447,216	$ 268,649
Restricted cash	22,567	31,447
Interest-bearing due from banks	3,363,348	877,286
Federal funds sold and other	0	0
Cash and cash equivalents	3,833,131	1,177,382
Securities purchased with agreement to resell	507,235	513,276
Debt Securities, Available-for-sale	3,591,280	3,558,870
Securities held-to-maturity (fair value of $2.7 billion and $2.7 billion, net of allowance for credit losses of $1.7 million and $1.6 million at June 30, 2023 and Dec. 31, 2022, respectively)	3,032,177	3,079,050
Consumer loans held-for-sale	85,981	42,237
Commercial loans held-for-sale	22,713	21,093
Loans	31,153,290	29,041,605
Less allowance for credit losses	(337,459)	(300,665)
Loans, net	30,815,831	28,740,940
Premises and equipment, net	244,853	327,885
Equity method investment	461,596	443,185
Accrued interest receivable	164,854	161,182
Goodwill	1,846,973	1,846,973
Core deposits and other intangible assets	30,981	34,555
Other real estate owned	2,555	7,952
Other assets	2,235,822	2,015,441
Total assets	46,875,982	41,970,021
Deposits:
Noninterest-bearing	8,436,799	9,812,744
Interest-bearing	10,433,361	7,884,605
Savings and money market accounts	13,645,849	13,774,534
Time	5,206,652	3,489,355
Total deposits	37,722,661	34,961,238
Securities sold under agreements to repurchase	163,774	194,910
Federal Home Loan Bank advances	2,200,917	464,436
Subordinated debt and other borrowings	424,497	424,055
Accrued interest payable	53,854	19,478
Other liabilities	466,520	386,512
Total liabilities	41,032,223	36,450,629
Shareholders' equity:
Preferred stock, no par value, 10.0 million shares authorized; 225,000 shares non-cumulative perpetual preferred stock, Series B, liquidation preference $225.0 million, issued and outstanding at June 30, 2023 and Dec. 31, 2022, respectively	217,126	217,126
Common stock, par value $1.00; 180.0 million shares authorized; 76.7 million and 76.5 million shares issued and outstanding at June 30, 2023 and Dec. 31, 2022, respectively	76,740	76,454
Additional paid-in capital	3,087,967	3,074,867
Retained earnings	2,634,315	2,341,706
Accumulated other comprehensive loss, net of taxes	(172,389)	(190,761)
Total shareholders' equity	5,843,759	5,519,392
Liabilities and Equity	$ 46,875,982	$ 41,970,021