v3.26.1
Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Deferred tax assets:    
Tax credits available for carryforward $ 68,895 $ 53,950
Net operating loss and other carryforward available 610,238 627,734
Postretirement and pension benefits 29,371 29,453
Allowance for credit losses 354,681 283,482
Deferred loan origination fees/cost   4,731
Depreciation 16,564 16,321
FDIC-assisted transaction 152,665 152,665
Lease liability 49,474 45,140
Unrealized net loss on investment securities 175,178 173,659
Difference in outside basis from pass-through entities   54,457
Mortgage Servicing Rights 14,597 15,375
Other temporary differences 38,983 33,933
Total gross deferred tax assets 1,510,646 1,490,900
Deferred tax liabilities:    
Intangibles 154,813 148,557
Right of use assets 45,037 40,721
Deferred loan origination fees/cost 18,739  
Loans acquired 17,305 17,053
Other temporary differences 10,144 7,511
Total gross deferred tax liabilities 246,038 213,842
Valuation allowance 470,565 464,740
Net deferred tax asset 794,043 812,318
PR    
Deferred tax assets:    
Tax credits available for carryforward 7,318 7,318
Net operating loss and other carryforward available 67,396 59,578
Postretirement and pension benefits 29,371 29,453
Allowance for credit losses 325,466 255,017
Deferred loan origination fees/cost   7,205
Depreciation 8,528 8,422
FDIC-assisted transaction 152,665 152,665
Lease liability 31,121 27,382
Unrealized net loss on investment securities 160,070 160,809
Difference in outside basis from pass-through entities   54,457
Mortgage Servicing Rights 14,597 15,375
Other temporary differences 31,753 26,347
Total gross deferred tax assets 828,285 804,028
Deferred tax liabilities:    
Intangibles 97,484 92,797
Right of use assets 28,352 24,846
Deferred loan origination fees/cost 16,568  
Loans acquired 17,305 17,053
Other temporary differences 9,715 7,082
Total gross deferred tax liabilities 169,424 141,778
Valuation allowance 83,979 78,153
Net deferred tax asset 574,882 584,097
US    
Deferred tax assets:    
Tax credits available for carryforward 61,577 46,632
Net operating loss and other carryforward available 542,842 568,156
Postretirement and pension benefits 0 0
Allowance for credit losses 29,215 28,465
Deferred loan origination fees/cost   (2,474)
Depreciation 8,036 7,899
FDIC-assisted transaction 0 0
Lease liability 18,353 17,758
Unrealized net loss on investment securities 15,108 12,850
Difference in outside basis from pass-through entities   0
Mortgage Servicing Rights 0 0
Other temporary differences 7,230 7,586
Total gross deferred tax assets 682,361 686,872
Deferred tax liabilities:    
Intangibles 57,329 55,760
Right of use assets 16,685 15,875
Deferred loan origination fees/cost 2,171  
Loans acquired 0 0
Other temporary differences 429 429
Total gross deferred tax liabilities 76,614 72,064
Valuation allowance 386,586 386,587
Net deferred tax asset $ 219,161 $ 228,221