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Note Income taxes (Components of deferred tax assets and liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Tax credits available for carryforward $ 23,657 $ 24,048
Net operating loss and other carryforward available 837,087 823,670
Postretirement and pension benefits 83,390 85,488
Allowance for loan losses 535,255 624,170
Accelerated depreciation 7,749 8,383
FDIC-assisted transaction 95,851  
Difference in outside basis from pass-through entities 20,209 30,424
Other temporary differences 32,479 31,985
Total gross deferred tax assets 1,641,682 1,635,689
Deferred tax liabilities:    
FDIC-assisted transaction   60,402
Indefinite-lived intangibles 73,678 64,982
Unrealized net gain (loss) on trading and available-for-sale securities 11,040 18,403
Other temporary differences 11,688 10,262
Total gross deferred tax liabilities 96,406 154,049
Valuation allowance 496,307 447,824
Net deferred tax asset 1,048,969 1,033,816
PUERTO RICO    
Deferred tax assets:    
Tax credits available for carryforward 15,900 16,069
Net operating loss and other carryforward available 116,154 115,512
Postretirement and pension benefits 83,390 85,488
Allowance for loan losses 516,643 603,462
Accelerated depreciation 1,963 1,300
FDIC-assisted transaction 95,851  
Difference in outside basis from pass-through entities 20,209 30,424
Other temporary differences 24,957 25,084
Total gross deferred tax assets 879,801 881,232
Deferred tax liabilities:    
FDIC-assisted transaction   60,402
Indefinite-lived intangibles 34,081 31,973
Unrealized net gain (loss) on trading and available-for-sale securities 23,823 26,364
Other temporary differences 10,579 9,876
Total gross deferred tax liabilities 68,483 128,615
Valuation allowance 89,852 67,263
Net deferred tax asset 721,466 685,354
UNITED STATES    
Deferred tax assets:    
Tax credits available for carryforward 7,757 7,979
Net operating loss and other carryforward available 720,933 708,158
Postretirement and pension benefits 0 0
Allowance for loan losses 18,612 20,708
Accelerated depreciation 5,786 7,083
FDIC-assisted transaction 0  
Difference in outside basis from pass-through entities 0 0
Other temporary differences 7,522 6,901
Total gross deferred tax assets 761,881 754,457
Deferred tax liabilities:    
FDIC-assisted transaction   0
Indefinite-lived intangibles 39,597 33,009
Unrealized net gain (loss) on trading and available-for-sale securities (12,783) (7,961)
Other temporary differences 1,109 386
Total gross deferred tax liabilities 27,923 25,434
Valuation allowance 406,455 380,561
Net deferred tax asset 327,503 348,462
Deferred loans origination fees    
Deferred tax assets:    
Deferred income 1,936 4,627
Deferred loans origination fees | PUERTO RICO    
Deferred tax assets:    
Deferred income 3,216 3,669
Deferred loans origination fees | UNITED STATES    
Deferred tax assets:    
Deferred income (1,280) 958
Deferred gain    
Deferred tax assets:    
Deferred income 2,551 2,670
Deferred gain | PUERTO RICO    
Deferred tax assets:    
Deferred income 0 0
Deferred gain | UNITED STATES    
Deferred tax assets:    
Deferred income 2,551 2,670
Intercompany deferred gains    
Deferred tax assets:    
Deferred income 1,518 224
Intercompany deferred gains | PUERTO RICO    
Deferred tax assets:    
Deferred income 1,518 224
Intercompany deferred gains | UNITED STATES    
Deferred tax assets:    
Deferred income $ 0 $ 0