Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net earnings (loss)	$ 126,888	$ (1,899,137)	$ 423,613
Goodwill impairment	0	1,376,736	29,000
Depreciation and amortization	54,593	52,691	53,595
Amortization of net premiums on investment securities	23,809	37,488	52,749
Accretion Expense	(105,089)	0	0
Intangible asset amortization	33,143	11,419	13,576
Amortization of operating lease ROU assets	33,666	27,176	30,228
Provision for credit losses	42,801	52,000	24,500
Gain on sale of foreclosed assets, net	(819)	(586)	(3,470)
Provision for losses on foreclosed assets	1,885	1,992	29
(Gain) loss on sale of loans and leases, net	(645)	161,346	(518)
Loss (gain) on disposal of premises and equipment	647	(571)	104
Loss on sale of securities, net	60,400	442,413	50,321
Gain on BOLI death benefits	(1,100)	(416)	0
credit-linked notes, net	(276)	5,629	(1,089)
LOCOM HFS Adjustment	(215)	8,461	0
Decrease (increase) in other assets	167,973	(214,614)	(83,666)
(Decrease) increase in accrued interest payable and other liabilities	(375,735)	45,044	78,231
Net cash provided by operating activities	77,374	135,768	701,972
Cash flows from investing activities:
Cash acquired in acquisitions, net of cash consideration paid	0	335,319	0
Net (increase) decrease in loans and leases	(662,358)	464,057	(5,816,608)
Proceeds from sales of loans and leases	2,455,814	8,524,063	72,214
Proceeds from maturities and paydowns of securities available-for-sale	243,572	261,042	658,719
Proceeds from sales of securities available-for-sale	693,338	3,028,011	2,013,094
Purchases of securities available-for-sale	(835,949)	(13,439)	(380,251)
Proceeds from maturities and paydowns of securities held-to-maturity	1,398	1,353	851
Purchases of FHLB and FRB stock	(23,440)	(304,014)	(160,315)
Redemptions of FHLB and FRB stock	2,013	272,162	143,275
Proceeds from sales of foreclosed assets	16,909	17,137	19,247
Purchases of premises and equipment, net	(13,047)	(15,219)	(20,128)
Proceeds from sales of premises and equipment	190	9,018	11
Proceeds from BOLI death benefits	5,058	3,946	555
Net decrease (increase) in equipment leased to others under operating leases	7,866	25,709	(100,734)
Net cash provided by (used in) investing activities	1,891,364	12,609,145	(3,570,070)
Cash flows from financing activities:
Net (decrease) increase in noninterest-bearing deposits	(54,341)	(5,722,546)	(3,330,776)
Net (decrease) increase in interest-bearing deposits	(3,155,519)	(4,359,678)	2,269,353
Net increase (decrease) in borrowings	(2,623,756)	(2,320,516)	0
Net proceeds from stock issuance	0	382,900	0
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan	308	69	0
Restricted stock surrendered		(5,419)	(9,531)
Common stock dividends paid		(48,881)	(120,256)
Net cash (used in) provided by financing activities	(4,844,102)	(9,607,559)	1,051,086
Net increase (decrease) in cash and cash equivalents	(2,875,364)	3,137,354	(1,817,012)
Cash and cash equivalents, beginning of year	5,377,576	2,240,222	4,057,234
Cash and cash equivalents, end of year	2,502,212	5,377,576	2,240,222
Supplemental disclosures of cash flow information:
Cash paid for interest	1,014,839	1,063,981	238,377
Cash (received) paid for income taxes	(14,450)	(68,168)	97,254
Loans transferred to foreclosed assets	19,978	20,915	7,985
Transfers from loans held for investment to loans held for sale	1,930,285	3,162,615	76,253
Loan, Transfer from Held-for-Sale to Held-in-Portfolio	1,179	513,914	0
Transfer of securities available-for-sale to held-to-maturity	0	0	2,260,407
Assets	33,542,864	38,534,064
Liabilities	30,042,915	35,143,299
Proceeds from Issuance of Debt	1,100,000	2,506,300	1,763,119
Parent [Member]
Cash flows from operating activities:
Earned stock compensation	15,448	28,697	34,769
Decrease (increase) in other assets	(42,141)	(466,018)	(323,852)
Cash flows from investing activities:
Cash acquired in acquisitions, net of cash consideration paid	0		0
Cash flows from financing activities:
Net proceeds from stock issuance	0	382,900	0
Net proceeds from preferred stock offering	0	0	498,516
Restricted stock surrendered	(2,708)	(5,419)	(9,531)
Preferred stock dividends paid	(39,788)	(39,788)	19,339
Common stock dividends paid	(68,298)	(48,881)	$ (120,256)
Supplemental disclosures of cash flow information:
Assets	3,897,093	3,805,364
Liabilities	$ 397,144	$ 414,599