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LOANS HELD FOR INVESTMENT - Corporation's Residential Mortgage Loans By Origination Year Based on Accrual Status (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Financing Receivable, Recorded Investment [Line Items]          
Loans held for investment $ 11,719,315   $ 11,719,315   $ 11,552,825
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 24,084 $ 12,592 42,001 $ 25,307  
Puerto Rico and Virgin Islands regions [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loans held for investment 9,721,046   9,721,046   9,464,474
Florida region [Member}          
Financing Receivable, Recorded Investment [Line Items]          
Loans held for investment 1,998,269   1,998,269   2,088,351
Residential Portfolio Segment [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 98,421   98,421    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 251,045   251,045    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 122,712   122,712    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 62,118   62,118    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 75,805   75,805    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 2,183,689   2,183,689    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 2,793,790   2,793,790   2,847,290
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff     0    
Financing Receivable, Year Two, Originated, Fiscal Year Before Current Fiscal Year, Writeoff     0    
Financing Receivable, Year Three, Originated, Two Years Before Current Fiscal Year, Writeoff     0    
Financing Receivable, Year Four, Originated, Three Years Before Current Fiscal Year, Writeoff     3    
Financing Receivable, Year Five, Originated, Four Years Before Current Fiscal Year, Writeoff     0    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff     2,126    
Financing Receivable, Revolving, Writeoff     0    
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 1,146 $ 2,079 2,129 $ 4,607  
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 98,421   98,421    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 251,045   251,045    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 122,677   122,677    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 62,118   62,118    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 75,375   75,375    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 2,150,902   2,150,902    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 2,760,538   2,760,538   2,804,518
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 35   35    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 430   430    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 32,787   32,787    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 33,252   33,252   42,772
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 61,271   61,271    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 170,930   170,930    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 73,757   73,757    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 31,601   31,601    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 47,087   47,087    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1,967,664   1,967,664    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 2,352,310   2,352,310   2,417,900
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff     0    
Financing Receivable, Year Two, Originated, Fiscal Year Before Current Fiscal Year, Writeoff     0    
Financing Receivable, Year Three, Originated, Two Years Before Current Fiscal Year, Writeoff     0    
Financing Receivable, Year Four, Originated, Three Years Before Current Fiscal Year, Writeoff     3    
Financing Receivable, Year Five, Originated, Four Years Before Current Fiscal Year, Writeoff     0    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff     2,126    
Financing Receivable, Revolving, Writeoff     0    
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff     2,129    
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member] | Performing Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 61,271   61,271    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 170,930   170,930    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 73,722   73,722    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 31,601   31,601    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 46,916   46,916    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1,942,056   1,942,056    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 2,326,496   2,326,496   2,382,429
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member] | Nonperforming Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 35   35    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 171   171    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 25,608   25,608    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 25,814   25,814   35,471
Residential Portfolio Segment [Member] | Florida region [Member}          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 37,150   37,150    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 80,115   80,115    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 48,955   48,955    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 30,517   30,517    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 28,718   28,718    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 216,025   216,025    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 441,480   441,480   429,390
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff     0    
Financing Receivable, Year Two, Originated, Fiscal Year Before Current Fiscal Year, Writeoff     0    
Financing Receivable, Year Three, Originated, Two Years Before Current Fiscal Year, Writeoff     0    
Financing Receivable, Year Four, Originated, Three Years Before Current Fiscal Year, Writeoff     0    
Financing Receivable, Year Five, Originated, Four Years Before Current Fiscal Year, Writeoff     0    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff     0    
Financing Receivable, Revolving, Writeoff     0    
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff     0    
Residential Portfolio Segment [Member] | Florida region [Member} | Performing Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 37,150   37,150    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 80,115   80,115    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 48,955   48,955    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 30,517   30,517    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 28,459   28,459    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 208,846   208,846    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 434,042   434,042   422,089
Residential Portfolio Segment [Member] | Florida region [Member} | Nonperforming Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 259   259    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 7,179   7,179    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 7,438   7,438   7,301
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 118   118    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 691   691    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 689   689    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 782   782    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1,117   1,117    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 101,488   101,488    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 104,885   104,885   118,158
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Performing Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 118   118    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 691   691    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 689   689    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 782   782    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1,117   1,117    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 101,488   101,488    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 104,885   104,885   118,158
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Nonperforming Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 0   0   0
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Puerto Rico and Virgin Islands regions [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 118   118    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 691   691    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 689   689    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 782   782    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1,117   1,117    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 100,760   100,760    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 104,157   104,157   117,416
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Puerto Rico and Virgin Islands regions [Member] | Performing Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 118   118    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 691   691    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 689   689    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 782   782    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1,117   1,117    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 100,760   100,760    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 104,157   104,157   117,416
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Puerto Rico and Virgin Islands regions [Member] | Nonperforming Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 0   0   0
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Florida region [Member}          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 728   728    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 728   728   742
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Florida region [Member} | Performing Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 728   728    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 728   728   742
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Florida region [Member} | Nonperforming Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 0   0   0
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 98,303   98,303    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 250,354   250,354    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 122,023   122,023    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 61,336   61,336    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 74,688   74,688    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 2,082,201   2,082,201    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 2,688,905   2,688,905   2,729,132
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Performing Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 98,303   98,303    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 250,354   250,354    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 121,988   121,988    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 61,336   61,336    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 74,258   74,258    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 2,049,414   2,049,414    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 2,655,653   2,655,653   2,686,360
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Nonperforming Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 35   35    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 430   430    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 32,787   32,787    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 33,252   33,252   42,772
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Puerto Rico and Virgin Islands regions [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 61,153   61,153    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 170,239   170,239    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 73,068   73,068    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 30,819   30,819    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 45,970   45,970    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1,866,904   1,866,904    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 2,248,153   2,248,153   2,300,484
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Puerto Rico and Virgin Islands regions [Member] | Performing Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 61,153   61,153    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 170,239   170,239    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 73,033   73,033    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 30,819   30,819    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 45,799   45,799    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1,841,296   1,841,296    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 2,222,339   2,222,339   2,265,013
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Puerto Rico and Virgin Islands regions [Member] | Nonperforming Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 35   35    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 171   171    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 25,608   25,608    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 25,814   25,814   35,471
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Florida region [Member}          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 37,150   37,150    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 80,115   80,115    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 48,955   48,955    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 30,517   30,517    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 28,718   28,718    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 215,297   215,297    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 440,752   440,752   428,648
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Florida region [Member} | Performing Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 37,150   37,150    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 80,115   80,115    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 48,955   48,955    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 30,517   30,517    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 28,459   28,459    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 208,118   208,118    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment 433,314   433,314   421,347
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Florida region [Member} | Nonperforming Financial Instruments [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0   0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 259   259    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 7,179   7,179    
Financing Receivable, Excluding Accrued Interest, Revolving 0   0    
Loans held for investment $ 7,438   $ 7,438   $ 7,301