CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income	$ 446,748	$ 845,502
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	129,946	33,499
Goodwill impairment charge	23,000	9,000
Amortization of intangibles	2,385	2,481
Depreciation and amortization of premises and equipment	43,180	41,207
Net accretion of discounts and amortization of premiums and deferred fees	(22,495)	39,142
Interest capitalized on loans subject to the temporary payment moratorium or loss mitigation alternatives	(7,956)	(9,249)
Share-based compensation	15,079	14,822
Impairment losses on right-of-use and long-lived assets	0	688
Fair value adjustments on mortgage servicing rights	11,135	(2,776)
Fair value adjustment for contingent consideration	0	(9,241)
Adjustments to indemnity reserves on loans sold	31	(1,140)
Earnings from investments under the equity method, net of dividends or distributions	(17,387)	(22,011)
Deferred income tax (benefit) expense	(13,539)	50,460
(Gain) loss on:
Disposition of premises and equipment and other productive assets	(9,744)	(7,221)
Proceeds from insurance claims	(145)	0
Sale of loans, including valuation adjustments on loans held-for-sale and mortgage banking activities	177	374
Disposition of stock as part of the Evertec Transactions	0	(240,412)
Sale of foreclosed assets, including write-downs	(18,137)	(24,339)
Acquisitions of loans held-for-sale	(6,678)	(118,368)
Proceeds from sale of loans held-for-sale	35,286	51,468
Net originations on loans held-for-sale	(60,285)	(191,570)
Net decrease (increase) in:
Trading debt securities	29,415	338,166
Equity securities	(7,481)	3,633
Accrued income receivable	(17,638)	(21,236)
Other assets	(981)	46,812
Net increase (decrease) in:
Interest payable	8,009	(4,936)
Pension and other postretirement benefits obligation	11,985	(2,252)
Other liabilities	(100,887)	(9,095)
Total adjustments	26,275	(32,094)
Net cash provided by operating activities	473,023	813,408
Cash flows from investing activities:
Net (increase) decrease in money market investments	(775,597)	13,562,791
Purchases of investment securities:
Available-for-sale	(12,665,449)	(18,142,424)
Held-to-maturity	(8,615)	(1,879,443)
Equity	(18,279)	(34,029)
Proceeds from calls, paydowns, maturities and redemptions of investment securities:
Available-for-sale	13,138,765	12,066,879
Held-to-maturity	308,129	9,185
Proceeds from sale of investment securities:
Equity	30,926	34,450
Net disbursements on loans	(1,609,387)	(1,762,828)
Proceeds from sale of loans	133,078	56,611
Acquisition of loan portfolios	(556,659)	(580,625)
Return of capital from equity method investments	249	0
Payments to acquire equity method investments	(1,500)	(1,625)
Proceeds from disposition of stock as part of the Evertec Transactions	0	219,883
Acquisition of premises and equipment	(133,598)	(67,887)
Proceeds from insurance claims	145	0
Proceeds from sale of:
Premises and equipment and other productive assets	6,620	8,963
Foreclosed assets	84,446	75,719
Net cash (used in) provided by investing activities	(2,066,726)	3,565,620
Net increase (decrease) in:
Deposits	2,085,956	(2,177,088)
Assets sold under agreements to repurchase	(55,538)	70,847
Other short-term borrowings	(365,000)	175,000
Payment of notes payable	(321,000)	(101,000)
Principal payments of finance leases	(3,557)	(2,363)
Proceeds from issuance of notes payable	437,411	0
Proceeds from issuance of common stock	4,716	4,285
Dividends paid	(119,715)	(121,190)
Net payments for repurchase of common stock	(414)	(631,749)
Payments related to tax witholding for share-based compensation	(4,077)	(5,771)
Net cash provided by (used in) financing activities	1,658,782	(2,789,029)
Net increase in cash and due from banks, and restricted cash	65,079	1,589,999
Cash and due from banks and restricted cash at beginning of period	476,159	434,512
Cash and due from banks and restricted cash at end of period	$ 541,238	$ 2,024,511