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 income	$ 614,212	$ 541,342	$ 1,102,641
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	256,942	208,609	83,030
Goodwill impairment losses	0	23,000	9,000
Amortization of intangibles	2,938	3,180	3,275
Depreciation and amortization of premises and equipment	57,078	58,507	55,107
Net accretion of discounts and amortization of premiums and deferred fees	(252,413)	(45,249)	29,120
Interest capitalized on loans subject to the temporary payment moratorium or loss mitigation alternatives	(7,109)	(9,868)	(11,521)
Share-based compensation	19,676	16,773	16,727
Impairment losses on right-of-use and long-lived assets	0	0	2,233
Fair value adjustments on mortgage servicing rights	11,370	12,339	(166)
Fair value adjustment for contingent consideration	0	0	(9,241)
Adjustments to indemnity reserves on loans sold	(1,266)	(2,319)	(919)
Earnings from investments under the equity method, net of dividends or distributions	(23,541)	(27,450)	(29,522)
Deferred income tax expense (benefit)	23,711	(43,139)	(33,129)
(Gain) loss on:
Disposition of premises and equipment and other productive assets	(7,558)	(12,756)	(9,453)
Proceeds from insurance claims	0	(145)	0
Sale of loans, including valuation adjustments on loans held-for-sale and mortgage banking activities	(758)	203	252
Sale of equity method investment	0	(152)	(8,198)
Sale of foreclosed assets, including write-downs	(17,953)	(22,665)	(33,008)
Acquisitions of loans held-for-sale	(6,886)	(7,639)	(122,363)
Proceeds from sale of loans held-for-sale	47,809	44,734	64,542
Net originations on loans held-for-sale	(49,579)	(68,310)	(202,913)
Net decrease (increase) in:
Trading debt securities	13,898	33,500	353,301
Equity securities	(6,847)	(11,341)	54
Accrued income receivable	216	(23,238)	(62,932)
Other assets	30,043	24,200	76,589
Net increase (decrease) in:
Interest payable	1,622	19,814	6,061
Pension and other postretirement benefits obligation	8,463	16,092	(2,893)
Other liabilities	(38,795)	(41,410)	(20,724)
Total adjustments	60,510	145,270	(88,103)
Net cash provided by operating activities	674,722	686,612	1,014,538
Cash flows from investing activities:
Net decrease (increase) in money market investments	620,578	(1,383,821)	11,922,703
Purchases of investment securities:
Available-for-sale	(34,339,865)	(16,707,264)	(22,232,278)
Held-to-maturity	0	(8,615)	(1,879,443)
Equity	(27,216)	(18,477)	(48,921)
Proceeds from calls, paydowns, maturities and redemptions of investment securities:
Available-for-sale	33,789,182	18,215,910	20,143,921
Held-to-maturity	659,543	458,806	9,826
Proceeds from sale of investment securities:
Equity	19,623	31,946	42,990
Net disbursements on loans	(1,636,569)	(2,475,837)	(2,237,084)
Proceeds from sale of loans	42,287	135,231	141,314
Acquisition of loan portfolios	(668,215)	(770,493)	(753,684)
Return of capital from equity method investments	279	249	681
Payments to acquire equity method investments	(1,250)	(1,500)	(1,625)
Proceeds from sale of equity method investment	0	152	8,198
Proceeds from sale of stock in equity method investee	4,489	0	0
Proceeds from disposition of stock as part of the Evertec Transactions	0	0	219,883
Acquisition of premises and equipment	(213,412)	(208,044)	(103,789)
Proceeds from insurance claims	0	145	0
Proceeds from sale of:
Premises and equipment and other productive assets	8,890	8,658	10,305
Foreclosed assets	109,182	109,547	107,203
Net cash (used in) provided by investing activities	(1,632,474)	(2,613,407)	5,350,200
Net increase (decrease) in:
Deposits	1,261,053	2,365,451	(5,770,261)
Assets sold under agreements to repurchase	(36,551)	(57,225)	57,006
Other short-term borrowings	225,000	(365,000)	290,000
Payment of notes payable	(91,943)	(343,261)	(103,147)
Principal payments of finance leases	(3,977)	(5,360)	(3,346)
Proceeds from issuance of notes payable	0	441,705	0
Proceeds from issuance of common stock	6,860	6,311	5,837
Dividends paid	(180,461)	(159,860)	(161,516)
Net payments for repurchase of common stock	(213,922)	(461)	(631,893)
Payments related to tax witholding for share-based compensation	(6,476)	(4,089)	(5,771)
Net cash provided by (used in) financing activities	959,583	1,878,211	(6,323,091)
Net increase (decrease) in cash and due from banks, and restricted cash	1,831	(48,584)	41,647
Cash and due from banks and restricted cash at beginning of period	427,575	476,159	434,512
Cash and due from banks and restricted cash at end of period	429,406	427,575	476,159
Other equity method investees
(Gain) loss on:
Sale of stock in equity method investee / as part of the Evertec Transactions	(551)	0	0
EVERTEC Assets
(Gain) loss on:
Sale of stock in equity method investee / as part of the Evertec Transactions	$ 0	$ 0	$ (240,412)