CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets [Abstract]
Cash and noninterest-bearing due from banks	$ 276,578	$ 228,620
Restricted cash	193,758	86,873
Interest-bearing due from banks	2,362,828	1,914,856
Cash and cash equivalents	2,833,164	2,230,349
Securities purchased with agreement to resell	66,480	558,009
Debt Securities, Available-for-sale	5,390,988	4,317,530
HeldToMaturitySecurities, net of allowance for credit losses	2,902,253	3,006,357
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	178,600	104,217
Commercial loans held-for-sale	8,617	9,280
Loans	34,308,310	32,676,091
Loans and Leases Receivable, Allowance	(391,534)	(353,055)
Loans, net	33,916,776	32,323,036
Premises and equipment, net	295,348	256,877
Equity Method Investments	424,637	445,223
Accrued interest receivable	226,178	217,491
Goodwill	1,846,973	1,846,973
Core deposits and other intangible assets	22,755	27,465
Other real estate owned	750	3,937
Other assets	2,588,369	2,613,139
Total assets	50,701,888	47,959,883
Deposits:
Noninterest-bearing	8,229,394	7,906,502
Interest-bearing	12,615,993	11,365,349
Savings and money market accounts	15,188,270	14,427,206
Time	4,921,231	4,840,753
Total deposits	40,954,888	38,539,810
Securities Sold under Agreements to Repurchase	209,956	209,489
Advances from Federal Home Loan Banks	2,146,395	2,138,169
Total Debt Outstanding	425,600	424,938
Accrued interest payable	59,285	66,967
Other liabilities	561,506	544,722
Total liabilities	44,357,630	41,924,095
Stockholders' Equity Attributable to Parent [Abstract]
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 Sept. 30, 2024 and Dec. 31, 2023, respectively	217,126	217,126
Common Stock, Value, Outstanding	77,232	76,767
Additional paid-in capital	3,120,842	3,109,493
Retained earnings	3,045,571	2,784,927
Accumulated other comprehensive loss, net of taxes	(116,513)	(152,525)
Total shareholders' equity	6,344,258	6,035,788
Total liabilities and shareholders' equity	$ 50,701,888	$ 47,959,883