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Income taxes - Components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Deferred tax assets:    
Tax credits available for carryforward $ 23,657 $ 23,657
Net operating loss and other carryforward available 836,666 837,087
Postretirement and pension benefits 82,650 83,390
Allowance for loan losses 469,859 535,255
Accelerated depreciation 7,650 7,749
FDIC-assisted transaction 88,821 95,851
Difference in outside basis from pass-through entities 15,399 20,209
Other temporary differences 37,798 32,479
Total gross deferred tax assets 1,567,166 1,641,682
Deferred tax liabilities:    
Indefinite-lived intangibles 77,721 73,678
Unrealized net gain (loss) on trading and available-for-sale securities 36,658 11,040
Other temporary differences 12,941 11,688
Total gross deferred tax liabilities 127,320 96,406
Valuation allowance 491,835 496,307
Net deferred tax asset 948,011 1,048,969
PUERTO RICO    
Deferred tax assets:    
Tax credits available for carryforward 15,900 15,900
Net operating loss and other carryforward available 122,413 116,154
Postretirement and pension benefits 82,650 83,390
Allowance for loan losses 449,995 516,643
Accelerated depreciation 1,963 1,963
FDIC-assisted transaction 88,821 95,851
Difference in outside basis from pass-through entities 15,399 20,209
Other temporary differences 29,792 24,957
Total gross deferred tax assets 811,387 879,801
Deferred tax liabilities:    
Indefinite-lived intangibles 35,746 34,081
Unrealized net gain (loss) on trading and available-for-sale securities 38,225 23,823
Other temporary differences 11,832 10,579
Total gross deferred tax liabilities 85,803 68,483
Valuation allowance 96,596 89,852
Net deferred tax asset 628,988 721,466
UNITED STATES    
Deferred tax assets:    
Tax credits available for carryforward 7,757 7,757
Net operating loss and other carryforward available 714,253 720,933
Postretirement and pension benefits 0 0
Allowance for loan losses 19,864 18,612
Accelerated depreciation 5,687 5,786
FDIC-assisted transaction 0 0
Difference in outside basis from pass-through entities 0 0
Other temporary differences 8,006 7,522
Total gross deferred tax assets 755,779 761,881
Deferred tax liabilities:    
Indefinite-lived intangibles 41,975 39,597
Unrealized net gain (loss) on trading and available-for-sale securities (1,567) (12,783)
Other temporary differences 1,109 1,109
Total gross deferred tax liabilities 41,517 27,923
Valuation allowance 395,239 406,455
Net deferred tax asset 319,023 327,503
Deferred loans origination fees    
Deferred tax assets:    
Deferred income 549 1,936
Deferred loans origination fees | PUERTO RICO    
Deferred tax assets:    
Deferred income 2,816 3,216
Deferred loans origination fees | UNITED STATES    
Deferred tax assets:    
Deferred income (2,267) (1,280)
Deferred gain    
Deferred tax assets:    
Deferred income 2,479 2,551
Deferred gain | PUERTO RICO    
Deferred tax assets:    
Deferred income 0 0
Deferred gain | UNITED STATES    
Deferred tax assets:    
Deferred income 2,479 2,551
Intercompany deferred gains    
Deferred tax assets:    
Deferred income 1,638 1,518
Intercompany deferred gains | PUERTO RICO    
Deferred tax assets:    
Deferred income 1,638 1,518
Intercompany deferred gains | UNITED STATES    
Deferred tax assets:    
Deferred income $ 0 $ 0