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Income taxes - Components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Deferred tax assets:    
Tax credits available for carryforward $ 37,786 $ 29,589
Net operating loss and other carryforward available 654,083 662,490
Postretirement and pension benefits 28,197 27,786
Allowance for credit losses 273,409 271,568
Deferred loan origination fees/cost 303  
Depreciation 15,251 14,929
FDIC-assisted transaction 152,665 152,665
Lease liability 41,370 41,618
Unrealized net loss on investment securities 218,736 273,407
Difference in outside basis from pass-through entities 53,043 50,144
Mortgage Servicing Rights 14,561 14,475
Other temporary differences 44,758 50,199
Total gross deferred tax assets 1,534,162 1,588,870
Deferred tax liabilities:    
Intangibles 147,885 144,277
Right of use assets 37,188 37,238
Deferred loan origination fees/cost 0 205
Loans acquired 17,471 18,415
Other temporary differences 7,567 7,228
Total gross deferred tax liabilities 210,111 207,363
Valuation allowance 463,718 456,751
Net deferred tax asset 860,333 924,756
PR    
Deferred tax assets:    
Tax credits available for carryforward 4,861 4,861
Net operating loss and other carryforward available 59,441 52,211
Postretirement and pension benefits 28,197 27,786
Allowance for credit losses 245,070 247,153
Deferred loan origination fees/cost 3,005  
Depreciation 7,700 7,700
FDIC-assisted transaction 152,665 152,665
Lease liability 27,417 25,167
Unrealized net loss on investment securities 202,822 252,411
Difference in outside basis from pass-through entities 53,043 50,144
Mortgage Servicing Rights 14,561 14,475
Other temporary differences 36,015 41,127
Total gross deferred tax assets 834,797 875,700
Deferred tax liabilities:    
Intangibles 90,392 88,351
Right of use assets 24,908 22,784
Deferred loan origination fees/cost 0 (1,880)
Loans acquired 17,471 18,415
Other temporary differences 7,138 6,799
Total gross deferred tax liabilities 139,909 134,469
Valuation allowance 76,804 69,837
Net deferred tax asset 618,084 671,394
US    
Deferred tax assets:    
Tax credits available for carryforward 32,925 24,728
Net operating loss and other carryforward available 594,642 610,279
Postretirement and pension benefits 0 0
Allowance for credit losses 28,339 24,415
Deferred loan origination fees/cost (2,702)  
Depreciation 7,551 7,229
FDIC-assisted transaction 0 0
Lease liability 13,953 16,451
Unrealized net loss on investment securities 15,914 20,996
Difference in outside basis from pass-through entities 0 0
Mortgage Servicing Rights 0 0
Other temporary differences 8,743 9,072
Total gross deferred tax assets 699,365 713,170
Deferred tax liabilities:    
Intangibles 57,493 55,926
Right of use assets 12,280 14,454
Deferred loan origination fees/cost 0 2,085
Loans acquired 0 0
Other temporary differences 429 429
Total gross deferred tax liabilities 70,202 72,894
Valuation allowance 386,914 386,914
Net deferred tax asset $ 242,249 $ 253,362