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Allowance for credit losses - Credit quality indicators of loans held-in-portfolio based obligor risk ratings (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
units
Mar. 31, 2019
USD ($)
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income $ 27,662,272 $ 27,406,873 $ 26,647,708
Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,511,493  
Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   591,291  
Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   996,694  
Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   5,067  
Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   8,842  
Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   3,113,387  
Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   24,293,486  
Construction      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 902,380 831,092 791,320
Construction | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   46,984  
Construction | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   17,940  
Construction | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   65,569  
Construction | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Construction | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Construction | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   130,493  
Construction | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   700,599  
Mortgages      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 7,094,757 7,183,532 7,207,180
Mortgages | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,187  
Mortgages | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,218  
Mortgages | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   138,712  
Mortgages | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Mortgages | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Mortgages | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   143,117  
Mortgages | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   7,040,415  
Legacy      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 20,435 22,105 24,404
Legacy | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   388  
Legacy | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   202  
Legacy | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,528  
Legacy | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Legacy | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Legacy | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,118  
Legacy | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   19,987  
Commercial      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   12,312,751 12,058,310
Commercial | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,461,398  
Commercial | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   570,920  
Commercial | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   698,793  
Commercial | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   5,067  
Commercial | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   16  
Commercial | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,736,194  
Commercial | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   9,576,557  
Commercial | Commercial multi-family      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 1,777,610 1,795,159  
Commercial | Commercial multi-family | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   49,700  
Commercial | Commercial multi-family | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   17,697  
Commercial | Commercial multi-family | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   10,226  
Commercial | Commercial multi-family | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Commercial | Commercial multi-family | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Commercial | Commercial multi-family | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   77,623  
Commercial | Commercial multi-family | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,717,536  
Commercial | CRE non-owner occupied      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 4,063,723 3,978,514  
Commercial | CRE non-owner occupied | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   572,965  
Commercial | CRE non-owner occupied | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   191,193  
Commercial | CRE non-owner occupied | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   340,106  
Commercial | CRE non-owner occupied | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   3,290  
Commercial | CRE non-owner occupied | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Commercial | CRE non-owner occupied | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,107,554  
Commercial | CRE non-owner occupied | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,870,960  
Commercial | CRE owner occupied      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 1,921,371 1,925,464  
Commercial | CRE owner occupied | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   220,193  
Commercial | CRE owner occupied | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   190,387  
Commercial | CRE owner occupied | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   197,203  
Commercial | CRE owner occupied | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,629  
Commercial | CRE owner occupied | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Commercial | CRE owner occupied | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   609,412  
Commercial | CRE owner occupied | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,316,052  
Commercial | Commercial and Industrial      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 4,736,265 4,613,614  
Commercial | Commercial and Industrial | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   618,540  
Commercial | Commercial and Industrial | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   171,643  
Commercial | Commercial and Industrial | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   151,258  
Commercial | Commercial and Industrial | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   148  
Commercial | Commercial and Industrial | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   16  
Commercial | Commercial and Industrial | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   941,605  
Commercial | Commercial and Industrial | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   3,672,009  
Leasing      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 1,088,542 1,059,507 963,232
Leasing | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Leasing | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Leasing | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   3,590  
Leasing | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Leasing | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   68  
Leasing | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   3,658  
Leasing | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,055,849  
Consumer      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   5,997,886 5,603,262
Consumer | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   536  
Consumer | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   11  
Consumer | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   88,502  
Consumer | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Consumer | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   8,758  
Consumer | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   97,807  
Consumer | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   5,900,079  
Consumer | Credit cards      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 1,064,723 1,123,836  
Consumer | Credit cards | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Consumer | Credit cards | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Consumer | Credit cards | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   19,461  
Consumer | Credit cards | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Consumer | Credit cards | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Consumer | Credit cards | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   19,461  
Consumer | Credit cards | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,104,375  
Consumer | Home equity lines of credit      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 122,340 122,381  
Consumer | Home equity lines of credit | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Consumer | Home equity lines of credit | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Consumer | Home equity lines of credit | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,024  
Consumer | Home equity lines of credit | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Consumer | Home equity lines of credit | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   7,930  
Consumer | Home equity lines of credit | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   9,954  
Consumer | Home equity lines of credit | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   112,427  
Consumer | Personal loans      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 1,778,214 1,692,590  
Consumer | Personal loans | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   77  
Consumer | Personal loans | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Consumer | Personal loans | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   21,222  
Consumer | Personal loans | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Consumer | Personal loans | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   403  
Consumer | Personal loans | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   21,702  
Consumer | Personal loans | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,670,888  
Consumer | Auto Loan      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 2,954,150 2,917,522  
Consumer | Auto Loan | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Consumer | Auto Loan | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Consumer | Auto Loan | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   30,775  
Consumer | Auto Loan | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Consumer | Auto Loan | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   372  
Consumer | Auto Loan | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   31,147  
Consumer | Auto Loan | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,886,375  
Consumer | Other      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 137,762 141,557  
Consumer | Other | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   459  
Consumer | Other | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   11  
Consumer | Other | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   15,020  
Consumer | Other | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Consumer | Other | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   53  
Consumer | Other | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   15,543  
Consumer | Other | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   126,014  
Puerto Rico      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 20,223,881 20,180,232 19,996,350
Puerto Rico | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,282,517  
Puerto Rico | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   528,419  
Puerto Rico | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   792,286  
Puerto Rico | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   5,067  
Puerto Rico | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   509  
Puerto Rico | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,608,798  
Puerto Rico | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   17,571,434  
Puerto Rico | Construction      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 164,390 137,470 91,372
Puerto Rico | Construction | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   340  
Puerto Rico | Construction | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   649  
Puerto Rico | Construction | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 20,771  
Weighted average obligor risk rating | units   11.01  
Puerto Rico | Construction | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 0  
Puerto Rico | Construction | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Construction | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   21,760  
Puerto Rico | Construction | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 115,710  
Weighted average obligor risk rating | units   7.85  
Puerto Rico | Mortgages      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 6,016,008 $ 6,166,748 6,375,588
Puerto Rico | Mortgages | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,187  
Puerto Rico | Mortgages | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,218  
Puerto Rico | Mortgages | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   127,621  
Puerto Rico | Mortgages | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Mortgages | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Mortgages | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   132,026  
Puerto Rico | Mortgages | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   6,034,722  
Puerto Rico | Commercial      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   7,261,130 7,391,122
Puerto Rico | Commercial | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,279,454  
Puerto Rico | Commercial | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   525,541  
Puerto Rico | Commercial | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 555,490  
Weighted average obligor risk rating | units   11.25  
Puerto Rico | Commercial | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 5,067  
Puerto Rico | Commercial | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   16  
Puerto Rico | Commercial | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,365,568  
Puerto Rico | Commercial | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 4,895,562  
Weighted average obligor risk rating | units   7.10  
Puerto Rico | Commercial | Commercial multi-family      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 147,265 $ 147,849  
Puerto Rico | Commercial | Commercial multi-family | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,341  
Puerto Rico | Commercial | Commercial multi-family | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   3,870  
Puerto Rico | Commercial | Commercial multi-family | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 1,793  
Weighted average obligor risk rating | units   11.82  
Puerto Rico | Commercial | Commercial multi-family | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 0  
Puerto Rico | Commercial | Commercial multi-family | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Commercial | Commercial multi-family | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   7,004  
Puerto Rico | Commercial | Commercial multi-family | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 140,845  
Weighted average obligor risk rating | units   6.02  
Puerto Rico | Commercial | CRE non-owner occupied      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 2,086,899 $ 2,108,218  
Puerto Rico | Commercial | CRE non-owner occupied | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   492,357  
Puerto Rico | Commercial | CRE non-owner occupied | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   166,810  
Puerto Rico | Commercial | CRE non-owner occupied | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 239,448  
Weighted average obligor risk rating | units   11.17  
Puerto Rico | Commercial | CRE non-owner occupied | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 3,290  
Puerto Rico | Commercial | CRE non-owner occupied | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Commercial | CRE non-owner occupied | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   901,905  
Puerto Rico | Commercial | CRE non-owner occupied | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 1,206,313  
Weighted average obligor risk rating | units   6.77  
Puerto Rico | Commercial | CRE owner occupied      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 1,578,411 $ 1,586,329  
Puerto Rico | Commercial | CRE owner occupied | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   192,895  
Puerto Rico | Commercial | CRE owner occupied | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   184,678  
Puerto Rico | Commercial | CRE owner occupied | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 183,377  
Weighted average obligor risk rating | units   11.36  
Puerto Rico | Commercial | CRE owner occupied | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 1,629  
Puerto Rico | Commercial | CRE owner occupied | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Commercial | CRE owner occupied | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   562,579  
Puerto Rico | Commercial | CRE owner occupied | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 1,023,750  
Weighted average obligor risk rating | units   7.30  
Puerto Rico | Commercial | Commercial and Industrial      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 3,518,407 $ 3,418,734  
Puerto Rico | Commercial | Commercial and Industrial | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   592,861  
Puerto Rico | Commercial | Commercial and Industrial | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   170,183  
Puerto Rico | Commercial | Commercial and Industrial | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 130,872  
Weighted average obligor risk rating | units   11.26  
Puerto Rico | Commercial | Commercial and Industrial | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 148  
Puerto Rico | Commercial | Commercial and Industrial | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   16  
Puerto Rico | Commercial | Commercial and Industrial | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   894,080  
Puerto Rico | Commercial | Commercial and Industrial | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 2,524,654  
Weighted average obligor risk rating | units   7.20  
Puerto Rico | Leasing      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 1,088,542 $ 1,059,507 963,232
Puerto Rico | Leasing | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Leasing | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Leasing | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   3,590  
Puerto Rico | Leasing | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Leasing | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   68  
Puerto Rico | Leasing | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   3,658  
Puerto Rico | Leasing | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,055,849  
Puerto Rico | Consumer      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   5,555,377 5,175,036
Puerto Rico | Consumer | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   536  
Puerto Rico | Consumer | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   11  
Puerto Rico | Consumer | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   84,814  
Puerto Rico | Consumer | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   425  
Puerto Rico | Consumer | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   85,786  
Puerto Rico | Consumer | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   5,469,591  
Puerto Rico | Consumer | Credit cards      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 1,064,687 1,123,800  
Puerto Rico | Consumer | Credit cards | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Credit cards | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Credit cards | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   19,461  
Puerto Rico | Consumer | Credit cards | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Credit cards | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Credit cards | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   19,461  
Puerto Rico | Consumer | Credit cards | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,104,339  
Puerto Rico | Consumer | Home equity lines of credit      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 4,929 5,038  
Puerto Rico | Consumer | Home equity lines of credit | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Home equity lines of credit | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Home equity lines of credit | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Home equity lines of credit | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Home equity lines of credit | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Home equity lines of credit | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Home equity lines of credit | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   5,038  
Puerto Rico | Consumer | Personal loans      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 1,463,226 1,368,150  
Puerto Rico | Consumer | Personal loans | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   77  
Puerto Rico | Consumer | Personal loans | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Personal loans | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   19,558  
Puerto Rico | Consumer | Personal loans | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Personal loans | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Personal loans | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   19,635  
Puerto Rico | Consumer | Personal loans | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,348,515  
Puerto Rico | Consumer | Auto Loan      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 2,954,150 2,917,522  
Puerto Rico | Consumer | Auto Loan | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Auto Loan | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Auto Loan | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   30,775  
Puerto Rico | Consumer | Auto Loan | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Auto Loan | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   372  
Puerto Rico | Consumer | Auto Loan | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   31,147  
Puerto Rico | Consumer | Auto Loan | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,886,375  
Puerto Rico | Consumer | Other      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 136,967 140,867  
Puerto Rico | Consumer | Other | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   459  
Puerto Rico | Consumer | Other | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   11  
Puerto Rico | Consumer | Other | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   15,020  
Puerto Rico | Consumer | Other | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Puerto Rico | Consumer | Other | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   53  
Puerto Rico | Consumer | Other | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   15,543  
Puerto Rico | Consumer | Other | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   125,324  
Popular U.S.      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 7,438,391 7,226,641 6,651,358
Popular U.S. | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   228,976  
Popular U.S. | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   62,872  
Popular U.S. | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   204,408  
Popular U.S. | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   8,333  
Popular U.S. | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   504,589  
Popular U.S. | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   6,722,052  
Popular U.S. | Construction      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 737,990 693,622 699,948
Popular U.S. | Construction | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   46,644  
Popular U.S. | Construction | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   17,291  
Popular U.S. | Construction | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 44,798  
Weighted average obligor risk rating | units   11.00  
Popular U.S. | Construction | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 0  
Popular U.S. | Construction | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Construction | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   108,733  
Popular U.S. | Construction | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 584,889  
Weighted average obligor risk rating | units   7.74  
Popular U.S. | Mortgages      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 1,078,749 $ 1,016,784 831,592
Popular U.S. | Mortgages | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Mortgages | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Mortgages | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   11,091  
Popular U.S. | Mortgages | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Mortgages | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Mortgages | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   11,091  
Popular U.S. | Mortgages | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,005,693  
Popular U.S. | Legacy      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 20,435 22,105 24,404
Popular U.S. | Legacy | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   388  
Popular U.S. | Legacy | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   202  
Popular U.S. | Legacy | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 1,528  
Weighted average obligor risk rating | units   11.25  
Popular U.S. | Legacy | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 0  
Popular U.S. | Legacy | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Legacy | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,118  
Popular U.S. | Legacy | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 19,987  
Weighted average obligor risk rating | units   7.95  
Popular U.S. | Commercial      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 5,051,621 4,667,188
Popular U.S. | Commercial | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   181,944  
Popular U.S. | Commercial | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   45,379  
Popular U.S. | Commercial | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 143,303  
Weighted average obligor risk rating | units   11.02  
Popular U.S. | Commercial | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 0  
Popular U.S. | Commercial | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Commercial | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   370,626  
Popular U.S. | Commercial | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 4,680,995  
Weighted average obligor risk rating | units   7.04  
Popular U.S. | Commercial | Commercial multi-family      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 1,630,345 $ 1,647,310  
Popular U.S. | Commercial | Commercial multi-family | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   48,359  
Popular U.S. | Commercial | Commercial multi-family | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   13,827  
Popular U.S. | Commercial | Commercial multi-family | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 8,433  
Weighted average obligor risk rating | units   11.25  
Popular U.S. | Commercial | Commercial multi-family | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 0  
Popular U.S. | Commercial | Commercial multi-family | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Commercial | Commercial multi-family | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   70,619  
Popular U.S. | Commercial | Commercial multi-family | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 1,576,691  
Weighted average obligor risk rating | units   7.37  
Popular U.S. | Commercial | CRE non-owner occupied      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 1,976,824 $ 1,870,296  
Popular U.S. | Commercial | CRE non-owner occupied | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   80,608  
Popular U.S. | Commercial | CRE non-owner occupied | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   24,383  
Popular U.S. | Commercial | CRE non-owner occupied | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 100,658  
Weighted average obligor risk rating | units   11.00  
Popular U.S. | Commercial | CRE non-owner occupied | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 0  
Popular U.S. | Commercial | CRE non-owner occupied | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Commercial | CRE non-owner occupied | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   205,649  
Popular U.S. | Commercial | CRE non-owner occupied | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 1,664,647  
Weighted average obligor risk rating | units   6.94  
Popular U.S. | Commercial | CRE owner occupied      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 342,960 $ 339,135  
Popular U.S. | Commercial | CRE owner occupied | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   27,298  
Popular U.S. | Commercial | CRE owner occupied | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   5,709  
Popular U.S. | Commercial | CRE owner occupied | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 13,826  
Weighted average obligor risk rating | units   11.02  
Popular U.S. | Commercial | CRE owner occupied | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 0  
Popular U.S. | Commercial | CRE owner occupied | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Commercial | CRE owner occupied | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   46,833  
Popular U.S. | Commercial | CRE owner occupied | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 292,302  
Weighted average obligor risk rating | units   7.48  
Popular U.S. | Commercial | Commercial and Industrial      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 1,217,858 $ 1,194,880  
Popular U.S. | Commercial | Commercial and Industrial | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   25,679  
Popular U.S. | Commercial | Commercial and Industrial | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,460  
Popular U.S. | Commercial | Commercial and Industrial | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 20,386  
Weighted average obligor risk rating | units   11.01  
Popular U.S. | Commercial | Commercial and Industrial | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 0  
Popular U.S. | Commercial | Commercial and Industrial | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Commercial | Commercial and Industrial | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   47,525  
Popular U.S. | Commercial | Commercial and Industrial | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 1,147,355  
Weighted average obligor risk rating | units   6.63  
Popular U.S. | Consumer      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 442,509 $ 428,226
Popular U.S. | Consumer | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   3,688  
Popular U.S. | Consumer | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   8,333  
Popular U.S. | Consumer | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   12,021  
Popular U.S. | Consumer | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   430,488  
Popular U.S. | Consumer | Credit cards      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 36 36  
Popular U.S. | Consumer | Credit cards | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Credit cards | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Credit cards | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Credit cards | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Credit cards | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Credit cards | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Credit cards | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   36  
Popular U.S. | Consumer | Home equity lines of credit      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 117,411 117,343  
Popular U.S. | Consumer | Home equity lines of credit | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Home equity lines of credit | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Home equity lines of credit | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,024  
Popular U.S. | Consumer | Home equity lines of credit | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Home equity lines of credit | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   7,930  
Popular U.S. | Consumer | Home equity lines of credit | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   9,954  
Popular U.S. | Consumer | Home equity lines of credit | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   107,389  
Popular U.S. | Consumer | Personal loans      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income 314,988 324,440  
Popular U.S. | Consumer | Personal loans | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Personal loans | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Personal loans | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   1,664  
Popular U.S. | Consumer | Personal loans | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Personal loans | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   403  
Popular U.S. | Consumer | Personal loans | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   2,067  
Popular U.S. | Consumer | Personal loans | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   322,373  
Popular U.S. | Consumer | Other      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income $ 795 690  
Popular U.S. | Consumer | Other | Watch      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Other | Special Mention      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Other | Substandard      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Other | Doubtful      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Other | Loss      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Other | Sub-total      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   0  
Popular U.S. | Consumer | Other | Pass / Unrated      
Financing Receivable, Recorded Investment      
Loans held-in-portfolio, net of unearned income   $ 690