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Note Allowance for loan losses (Average recorded investment and interest income recognized on impaired loans) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | $ 1,009,563 | $ 955,782 | $ 986,943 | $ 959,458
Interest Income Recognized | 7,738 | 6,488 | 26,150 | 21,873
Commercial multi-family | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 1,100 | 141 | 634 | 111
Interest Income Recognized | 9 | 1 | 28 | 4
CRE non-owner occupied | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 132,927 | 117,650 | 128,143 | 118,243
Interest Income Recognized | 1,371 | 1,272 | 4,278 | 3,997
CRE owner occupied | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 148,931 | 151,580 | 151,192 | 158,046
Interest Income Recognized | 1,636 | 1,413 | 4,786 | 4,640
Commercial and industrial | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 74,770 | 61,950 | 67,775 | 61,072
Interest Income Recognized | 1,053 | 531 | 2,793 | 1,682
Construction | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 20,078 |  | 11,112 |
Interest Income Recognized | 0 |  | 25 |
Mortgages | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 517,196 | 516,684 | 518,147 | 512,575
Interest Income Recognized | 3,604 | 3,271 | 13,920 | 11,550
Leasing | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 1,031 | 1,568 | 1,220 | 1,689
Interest Income Recognized | 0 | 0 | 0 | 0
Consumer | Credit cards | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 31,998 | 35,727 | 32,734 | 36,718
Interest Income Recognized | 0 | 0 | 0 | 0
Consumer | Home equity lines of credit | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 6,208 | 2,572 | 5,446 | 2,632
Interest Income Recognized | 0 | 0 | 0 | 0
Consumer | Personal | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 73,121 | 64,854 | 67,818 | 65,402
Interest Income Recognized | 65 | 0 | 320 | 0
Consumer | Auto Loan | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 1,067 | 2,065 | 1,476 | 2,079
Interest Income Recognized | 0 | 0 | 0 | 0
Consumer | Other | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 1,136 | 991 | 1,246 | 891
Interest Income Recognized | 0 | 0 | 0 | 0
PUERTO RICO |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 975,426 | 943,452 | 962,569 | 947,439
Interest Income Recognized | 7,695 | 6,428 | 26,020 | 21,717
PUERTO RICO | Commercial multi-family | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 1,100 | 141 | 634 | 111
Interest Income Recognized | 9 | 1 | 28 | 4
PUERTO RICO | CRE non-owner occupied | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 132,927 | 117,650 | 128,143 | 118,243
Interest Income Recognized | 1,371 | 1,272 | 4,278 | 3,997
PUERTO RICO | CRE owner occupied | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 148,931 | 151,580 | 151,192 | 158,046
Interest Income Recognized | 1,636 | 1,413 | 4,786 | 4,640
PUERTO RICO | Commercial and industrial | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 74,770 | 61,950 | 67,775 | 61,072
Interest Income Recognized | 1,053 | 531 | 2,793 | 1,682
PUERTO RICO | Construction | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 2,194 |  | 2,170 |
Interest Income Recognized | 0 |  | 25 |
PUERTO RICO | Mortgages | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 507,919 | 507,689 | 508,930 | 503,628
Interest Income Recognized | 3,561 | 3,211 | 13,790 | 11,394
PUERTO RICO | Leasing | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 1,031 | 1,568 | 1,220 | 1,689
Interest Income Recognized | 0 | 0 | 0 | 0
PUERTO RICO | Consumer | Credit cards | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 31,998 | 35,727 | 32,734 | 36,718
Interest Income Recognized | 0 | 0 | 0 | 0
PUERTO RICO | Consumer | Home equity lines of credit | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
PUERTO RICO | Consumer | Personal | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 72,353 | 64,091 | 67,049 | 64,962
Interest Income Recognized | 65 | 0 | 320 | 0
PUERTO RICO | Consumer | Auto Loan | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 1,067 | 2,065 | 1,476 | 2,079
Interest Income Recognized | 0 | 0 | 0 | 0
PUERTO RICO | Consumer | Other | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 1,136 | 991 | 1,246 | 891
Interest Income Recognized | 0 | 0 | 0 | 0
UNITED STATES |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 34,137 | 12,330 | 24,374 | 12,019
Interest Income Recognized | 43 | 60 | 130 | 156
UNITED STATES | Commercial multi-family | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
UNITED STATES | CRE non-owner occupied | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
UNITED STATES | CRE owner occupied | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
UNITED STATES | Commercial and industrial | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
UNITED STATES | Construction | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 17,884 |  | 8,942 |
Interest Income Recognized | 0 |  | 0 |
UNITED STATES | Mortgages | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 9,277 | 8,995 | 9,217 | 8,947
Interest Income Recognized | 43 | 60 | 130 | 156
UNITED STATES | Leasing | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
UNITED STATES | Consumer | Credit cards | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
UNITED STATES | Consumer | Home equity lines of credit | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 6,208 | 2,572 | 5,446 | 2,632
Interest Income Recognized | 0 | 0 | 0 | 0
UNITED STATES | Consumer | Personal | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 768 | 763 | 769 | 440
Interest Income Recognized | 0 | 0 | 0 | 0
UNITED STATES | Consumer | Auto Loan | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
UNITED STATES | Consumer | Other | Non Covered Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | $ 0 | $ 0 | $ 0 | $ 0

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