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Note Allowance for loan losses (Disclosures related to loans individually evaluated for impairment) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Related Allowance $ 117,015 $ 109,091
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 108,969 112,897
Impaired Financing Receivable, with Related Allowance, Recorded Investment 872,254 834,526
Recorded Investment 981,223 947,423
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 178,607 188,347
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 961,174 920,046
Unpaid Principal Balance 1,139,781 1,108,393
PUERTO RICO    
Financing Receivable, Impaired [Line Items]    
Related Allowance 113,324 105,660
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 105,398 109,444
Impaired Financing Receivable, with Related Allowance, Recorded Investment 860,899 823,680
Recorded Investment 966,297 933,124
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 174,080 183,946
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 948,133 907,523
Unpaid Principal Balance 1,122,213 1,091,469
UNITED STATES | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 3,691 3,431
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 3,571 3,453
Impaired Financing Receivable, with Related Allowance, Recorded Investment 11,355 10,846
Recorded Investment 14,926 14,299
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 4,527 4,401
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 13,041 12,523
Unpaid Principal Balance 17,568 16,924
Commercial multi-family | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 3 32
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 129 206
Recorded Investment 129 206
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 129 206
Unpaid Principal Balance 129 206
Commercial multi-family | PUERTO RICO | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 3 32
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 129 206
Recorded Investment 129 206
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 129 206
Unpaid Principal Balance 129 206
CRE non-owner occupied | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 29,904 23,744
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 14,951 11,454
Impaired Financing Receivable, with Related Allowance, Recorded Investment 118,828 101,485
Recorded Investment 133,779 112,939
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 30,032 27,522
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 119,540 102,262
Unpaid Principal Balance 149,572 129,784
CRE non-owner occupied | PUERTO RICO | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 29,904 23,744
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 14,951 11,454
Impaired Financing Receivable, with Related Allowance, Recorded Investment 118,828 101,485
Recorded Investment 133,779 112,939
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 30,032 27,522
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 119,540 102,262
Unpaid Principal Balance 149,572 129,784
CRE owner occupied | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 11,652 10,221
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 23,962 24,634
Impaired Financing Receivable, with Related Allowance, Recorded Investment 130,676 127,634
Recorded Investment 154,638 152,268
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 53,495 57,219
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 154,775 153,495
Unpaid Principal Balance 208,270 210,714
CRE owner occupied | PUERTO RICO | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 11,652 10,221
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 23,962 24,634
Impaired Financing Receivable, with Related Allowance, Recorded Investment 130,676 127,634
Recorded Investment 154,638 152,268
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 53,495 57,219
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 154,775 153,495
Unpaid Principal Balance 208,270 210,714
Commercial and industrial | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 3,469 2,985
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 13,395 14,549
Impaired Financing Receivable, with Related Allowance, Recorded Investment 50,123 43,493
Recorded Investment 63,518 58,042
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 22,823 23,977
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 53,199 46,918
Unpaid Principal Balance 76,022 70,895
Commercial and industrial | PUERTO RICO | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 3,469 2,985
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 13,395 14,549
Impaired Financing Receivable, with Related Allowance, Recorded Investment 50,123 43,493
Recorded Investment 63,518 58,042
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 22,823 23,977
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 53,199 46,918
Unpaid Principal Balance 76,022 70,895
Construction | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 474  
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 4,293  
Recorded Investment 4,293  
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0  
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 4,293  
Unpaid Principal Balance 4,293  
Construction | PUERTO RICO | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 474  
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 4,293  
Recorded Investment 4,293  
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0  
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 4,293  
Unpaid Principal Balance 4,293  
Mortgages | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 46,915 48,832
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 55,312 61,275
Impaired Financing Receivable, with Related Allowance, Recorded Investment 464,610 457,000
Recorded Investment 519,922 518,275
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 70,885 78,625
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 525,639 512,445
Unpaid Principal Balance 596,524 591,070
Mortgages | PUERTO RICO | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 44,419 46,354
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 53,090 58,807
Impaired Financing Receivable, with Related Allowance, Recorded Investment 457,759 450,226
Recorded Investment 510,849 509,033
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 67,730 75,228
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 517,106 504,006
Unpaid Principal Balance 584,836 579,234
Mortgages | UNITED STATES | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 2,496 2,478
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,222 2,468
Impaired Financing Receivable, with Related Allowance, Recorded Investment 6,851 6,774
Recorded Investment 9,073 9,242
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 3,155 3,397
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 8,533 8,439
Unpaid Principal Balance 11,688 11,836
Leasing | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 448 475
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,361 1,456
Recorded Investment 1,361 1,456
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 1,361 1,456
Unpaid Principal Balance 1,361 1,456
Leasing | PUERTO RICO | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 448 475
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,361 1,456
Recorded Investment 1,361 1,456
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 1,361 1,456
Unpaid Principal Balance 1,361 1,456
Consumer | Credit cards | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 5,892 5,569
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 33,265 33,676
Recorded Investment 33,265 33,676
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 33,265 33,676
Unpaid Principal Balance 33,265 33,676
Consumer | Credit cards | PUERTO RICO | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 5,892 5,569
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 33,265 33,676
Recorded Investment 33,265 33,676
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 33,265 33,676
Unpaid Principal Balance 33,265 33,676
Consumer | Home equity lines of credit | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 959 722
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 1,127 761
Impaired Financing Receivable, with Related Allowance, Recorded Investment 3,952 3,530
Recorded Investment 5,079 4,291
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 1,150 780
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 3,955 3,542
Unpaid Principal Balance 5,105 4,322
Consumer | Home equity lines of credit | UNITED STATES | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 959 722
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 1,127 761
Impaired Financing Receivable, with Related Allowance, Recorded Investment 3,952 3,530
Recorded Investment 5,079 4,291
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 1,150 780
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 3,955 3,542
Unpaid Principal Balance 5,105 4,322
Consumer | Personal | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 16,703 15,921
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 222 224
Impaired Financing Receivable, with Related Allowance, Recorded Investment 61,553 63,030
Recorded Investment 61,775 63,254
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 222 224
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 61,554 63,030
Unpaid Principal Balance 61,776 63,254
Consumer | Personal | PUERTO RICO | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 16,467 15,690
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 61,001 62,488
Recorded Investment 61,001 62,488
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 61,001 62,488
Unpaid Principal Balance 61,001 62,488
Consumer | Personal | UNITED STATES | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 236 231
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 222 224
Impaired Financing Receivable, with Related Allowance, Recorded Investment 552 542
Recorded Investment 774 766
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 222 224
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 553 542
Unpaid Principal Balance 775 766
Consumer | Auto | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 355 425
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,763 2,007
Recorded Investment 1,763 2,007
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 1,763 2,007
Unpaid Principal Balance 1,763 2,007
Consumer | Auto | PUERTO RICO | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 355 425
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,763 2,007
Recorded Investment 1,763 2,007
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 1,763 2,007
Unpaid Principal Balance 1,763 2,007
Consumer | Other | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 241 165
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,701 1,009
Recorded Investment 1,701 1,009
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 1,701 1,009
Unpaid Principal Balance 1,701 1,009
Consumer | Other | PUERTO RICO | Non Covered Loans    
Financing Receivable, Impaired [Line Items]    
Related Allowance 241 165
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,701 1,009
Recorded Investment 1,701 1,009
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 1,701 1,009
Unpaid Principal Balance $ 1,701 $ 1,009