LOANS HELD FOR INVESTMENT - Corporation's Residential Mortgage Loans By Origination Year Based on Accrual Status (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 12,311,448		$ 12,185,483
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	29,339	$ 17,917
Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	10,208,330		10,163,222
Florida region [Member}
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	2,103,118		2,022,261
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	48,875
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	259,410
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	239,004
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	112,708
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	58,532
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,083,058
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	2,801,587		2,821,726
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	516
Financing Receivable, Revolving, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	516	$ 983
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	48,875
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	259,410
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	238,688
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	112,708
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	58,532
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,050,689
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	2,768,902		2,789,487
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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	316
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	32,369
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	32,685		32,239
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	30,350
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	170,736
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	161,789
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	68,106
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	29,593
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,866,666
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	2,327,240		2,356,006
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	516
Financing Receivable, Revolving, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	516
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	30,350
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	170,736
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	161,721
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	68,106
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	29,593
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,842,520
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	2,303,026		2,330,994
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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	68
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	24,146
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	24,214		25,012
Residential Portfolio Segment [Member] | Florida region [Member}
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	18,525
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	88,674
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	77,215
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	44,602
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	28,939
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	216,392
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	474,347		465,720
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	18,525
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	88,674
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	76,967
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	44,602
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	28,939
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	208,169
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	465,876		458,493
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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	248
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	8,223
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	8,471		7,227
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	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	615
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	676
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,368
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	638
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	96,358
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	99,655		100,236
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	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	615
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	676
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,368
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	638
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	96,358
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	99,655		100,236
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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	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	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	615
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	676
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,368
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	638
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	95,657
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	98,954		99,293
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	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	615
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	676
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,368
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	638
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	95,657
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	98,954		99,293
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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	701
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	701		943
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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	701
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	701		943
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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	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	48,875
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	258,795
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	238,328
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	111,340
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	57,894
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,986,700
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	2,701,932		2,721,490
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	48,875
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	258,795
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	238,012
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	111,340
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	57,894
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,954,331
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	2,669,247		2,689,251
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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	316
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	32,369
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	32,685		32,239
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	30,350
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	170,121
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	161,113
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	66,738
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	28,955
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,771,009
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	2,228,286		2,256,713
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	30,350
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	170,121
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	161,045
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	66,738
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	28,955
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,746,863
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	2,204,072		2,231,701
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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	68
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	24,146
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	24,214		25,012
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	18,525
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	88,674
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	77,215
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	44,602
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	28,939
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	215,691
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	473,646		464,777
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	18,525
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	88,674
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	76,967
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	44,602
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	28,939
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	207,468
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	465,175		457,550
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
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	248
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	8,223
Financing Receivable, Excluding Accrued Interest, Revolving	0
Loans held for investment	$ 8,471		$ 7,227