CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets [Abstract]
Cash and noninterest-bearing due from banks	$ 279,652	$ 268,649
Restricted cash	17,356	31,447
Interest-bearing due from banks	2,855,094	877,286
Cash and cash equivalents	3,152,102	1,177,382
Securities purchased with agreement to resell	500,000	513,276
Debt Securities, Available-for-sale	3,863,697	3,558,870
HeldToMaturitySecurities, net of allowance for credit losses	3,018,579	3,079,050
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	119,489	42,237
Commercial loans held-for-sale	20,513	21,093
Loans	31,943,284	29,041,605
Loans and Leases Receivable, Allowance	(346,192)	(300,665)
Loans, net	31,597,092	28,740,940
Premises and equipment, net	252,669	327,885
Equity Method Investments	480,996	443,185
Accrued interest receivable	177,390	161,182
Goodwill	1,846,973	1,846,973
Core deposits and other intangible assets	29,216	34,555
Other real estate owned	2,555	7,952
Other assets	2,462,519	2,015,441
Total assets	47,523,790	41,970,021
Deposits:
Noninterest-bearing	8,324,325	9,812,744
Interest-bearing	10,852,086	7,884,605
Savings and money market accounts	14,306,359	13,774,534
Time	4,813,039	3,489,355
Total deposits	38,295,809	34,961,238
Securities Sold under Agreements to Repurchase	195,999	194,910
Advances from Federal Home Loan Banks	2,110,598	464,436
Total Debt Outstanding	424,718	424,055
Accrued interest payable	67,442	19,478
Other liabilities	591,583	386,512
Total liabilities	41,686,149	36,450,629
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, 2023 and Dec. 31, 2022, respectively	217,126	217,126
Common Stock, Value, Outstanding	76,753	76,454
Additional paid-in capital	3,097,702	3,074,867
Retained earnings	2,745,934	2,341,706
Accumulated other comprehensive loss, net of taxes	(299,874)	(190,761)
Total shareholders' equity	5,837,641	5,519,392
Total liabilities and shareholders' equity	$ 47,523,790	$ 41,970,021