INVESTMENT SECURITIES - Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands |
Mar. 31, 2022 |
Dec. 31, 2021 |
Mar. 31, 2021 |
Dec. 31, 2020 |
Schedule Of Available For Sale Securities [Line Items] |
|
|
|
|
Amortized cost |
$ 6,836,842
|
$ 6,534,503
|
|
|
Gross unrealized gain |
6,358
|
28,900
|
|
|
Gross unrealized loss |
417,829
|
108,537
|
|
|
Allowance for Credit Losses |
711
|
1,105
|
$ 1,183
|
$ 1,310
|
Fair value |
$ 6,424,660
|
$ 6,453,761
|
|
|
Weighted-average yield |
1.11%
|
1.03%
|
|
|
U.S. Treasury securities [Member] |
|
|
|
|
Schedule Of Available For Sale Securities [Line Items] |
|
|
|
|
Amortized cost Due within one year |
|
$ 149,660
|
|
|
Gross Unrealized gains Due within one year |
|
59
|
|
|
Gross Unrealized losses Due within one year |
|
1,233
|
|
|
Allowance for Credit Losses within one year |
|
0
|
|
|
Fair value Due within one year |
|
$ 148,486
|
|
|
Weighted-average yield Due within one year |
|
0.68%
|
|
|
Amortized cost After 1 to 5 years |
$ 149,462
|
|
|
|
Gross Unrealized gains After 1 to 5 years |
0
|
|
|
|
Gross Unrealized losses After 1 to 5 years |
6,713
|
|
|
|
Allowance for Credit Losses After 1 to 5 years |
0
|
|
|
|
Fair value After 1 to 5 years |
$ 142,749
|
|
|
|
Weighted-average yield After 1 to 5 years |
0.68%
|
|
|
|
U.S. government-sponsored agencies obigations [Member] |
|
|
|
|
Schedule Of Available For Sale Securities [Line Items] |
|
|
|
|
Amortized cost After 1 to 5 years |
$ 2,340,512
|
$ 1,877,181
|
|
|
Gross Unrealized gains After 1 to 5 years |
28
|
240
|
|
|
Gross Unrealized losses After 1 to 5 years |
122,189
|
29,555
|
|
|
Allowance for Credit Losses After 1 to 5 years |
0
|
0
|
|
|
Fair value After 1 to 5 years |
$ 2,218,351
|
$ 1,847,866
|
|
|
Weighted-average yield After 1 to 5 years |
0.77%
|
0.60%
|
|
|
Amortized cost After 5 to 10 years |
$ 239,860
|
$ 403,785
|
|
|
Gross Unrealized gains After 5 to 10 years |
62
|
175
|
|
|
Gross Unrealized losses After 5 to 10 years |
19,049
|
10,856
|
|
|
Allowance for Credit Losses After 5 to 10 years |
0
|
0
|
|
|
Fair value After 5 to 10 years |
$ 220,873
|
$ 393,104
|
|
|
Weighted-average yield After 5 to 10 years |
0.96%
|
0.90%
|
|
|
Amortized cost After 10 years |
$ 14,775
|
$ 15,788
|
|
|
Gross Unrealized gains After 10 years |
202
|
224
|
|
|
Gross Unrealized losses After 10 years |
0
|
0
|
|
|
Allowance for Credit Losses After 10 years |
0
|
0
|
|
|
Fair value After 10 years |
$ 14,977
|
$ 16,012
|
|
|
Weighted-average yield After 10 years |
0.88%
|
0.63%
|
|
|
Puerto Rico government obligations [Member] |
|
|
|
|
Schedule Of Available For Sale Securities [Line Items] |
|
|
|
|
Amortized cost After 10 years |
$ 3,498
|
$ 3,574
|
|
|
Gross Unrealized gains After 10 years |
0
|
0
|
|
|
Gross Unrealized losses After 10 years |
463
|
416
|
|
|
Allowance for Credit Losses After 10 years |
308
|
308
|
|
|
Fair value After 10 years |
$ 2,727
|
$ 2,850
|
|
|
Weighted-average yield After 10 years |
0.00%
|
0.00%
|
|
|
Allowance for Credit Losses |
$ 308
|
$ 308
|
308
|
308
|
United States And Puerto Rico Government Obligations [Member] |
|
|
|
|
Schedule Of Available For Sale Securities [Line Items] |
|
|
|
|
Amortized cost |
2,748,107
|
2,449,988
|
|
|
Gross unrealized gain |
292
|
698
|
|
|
Gross unrealized loss |
148,414
|
42,060
|
|
|
Allowance for Credit Losses |
308
|
308
|
|
|
Fair value |
$ 2,599,677
|
$ 2,408,318
|
|
|
Weighted-average yield |
0.78%
|
0.67%
|
|
|
MBS [Member] |
|
|
|
|
Schedule Of Available For Sale Securities [Line Items] |
|
|
|
|
Amortized cost |
$ 4,087,735
|
$ 4,083,515
|
|
|
Gross unrealized gain |
6,066
|
28,202
|
|
|
Gross unrealized loss |
269,415
|
66,477
|
|
|
Allowance for Credit Losses |
403
|
797
|
|
|
Fair value |
$ 3,823,983
|
$ 4,044,443
|
|
|
Weighted-average yield |
1.34%
|
1.26%
|
|
|
MBS [Member] | FHLMC [Member] |
|
|
|
|
Schedule Of Available For Sale Securities [Line Items] |
|
|
|
|
Amortized cost After 1 to 5 years |
$ 6,181
|
$ 2,811
|
|
|
Gross Unrealized gains After 1 to 5 years |
19
|
119
|
|
|
Gross Unrealized losses After 1 to 5 years |
11
|
0
|
|
|
Allowance for Credit Losses After 1 to 5 years |
0
|
0
|
|
|
Fair value After 1 to 5 years |
$ 6,189
|
$ 2,930
|
|
|
Weighted-average yield After 1 to 5 years |
2.33%
|
2.65%
|
|
|
Amortized cost After 5 to 10 years |
$ 207,503
|
$ 193,234
|
|
|
Gross Unrealized gains After 5 to 10 years |
207
|
2,419
|
|
|
Gross Unrealized losses After 5 to 10 years |
7,905
|
1,122
|
|
|
Allowance for Credit Losses After 5 to 10 years |
0
|
0
|
|
|
Fair value After 5 to 10 years |
$ 199,805
|
$ 194,531
|
|
|
Weighted-average yield After 5 to 10 years |
1.37%
|
1.29%
|
|
|
Amortized cost After 10 years |
$ 1,221,834
|
$ 1,240,964
|
|
|
Gross Unrealized gains After 10 years |
194
|
3,748
|
|
|
Gross Unrealized losses After 10 years |
94,235
|
23,503
|
|
|
Allowance for Credit Losses After 10 years |
0
|
0
|
|
|
Fair value After 10 years |
$ 1,127,793
|
$ 1,221,209
|
|
|
Weighted-average yield After 10 years |
1.26%
|
1.18%
|
|
|
Amortized cost |
$ 1,435,518
|
$ 1,437,009
|
|
|
Gross unrealized gain |
420
|
6,286
|
|
|
Gross unrealized loss |
102,151
|
24,625
|
|
|
Allowance for Credit Losses |
0
|
0
|
|
|
Fair value |
$ 1,333,787
|
$ 1,418,670
|
|
|
Weighted-average yield |
1.28%
|
1.20%
|
|
|
MBS [Member] | GNMA [Member] |
|
|
|
|
Schedule Of Available For Sale Securities [Line Items] |
|
|
|
|
Amortized cost Due within one year |
$ 7
|
$ 2
|
|
|
Gross Unrealized gains Due within one year |
0
|
0
|
|
|
Gross Unrealized losses Due within one year |
0
|
0
|
|
|
Allowance for Credit Losses within one year |
0
|
0
|
|
|
Fair value Due within one year |
$ 7
|
$ 2
|
|
|
Weighted-average yield Due within one year |
1.70%
|
1.32%
|
|
|
Amortized cost After 1 to 5 years |
$ 22,699
|
$ 16,714
|
|
|
Gross Unrealized gains After 1 to 5 years |
201
|
572
|
|
|
Gross Unrealized losses After 1 to 5 years |
265
|
0
|
|
|
Allowance for Credit Losses After 1 to 5 years |
0
|
0
|
|
|
Fair value After 1 to 5 years |
$ 22,635
|
$ 17,286
|
|
|
Weighted-average yield After 1 to 5 years |
2.05%
|
2.90%
|
|
|
Amortized cost After 5 to 10 years |
$ 27,524
|
$ 27,271
|
|
|
Gross Unrealized gains After 5 to 10 years |
0
|
80
|
|
|
Gross Unrealized losses After 5 to 10 years |
1,097
|
139
|
|
|
Allowance for Credit Losses After 5 to 10 years |
0
|
0
|
|
|
Fair value After 5 to 10 years |
$ 26,427
|
$ 27,212
|
|
|
Weighted-average yield After 5 to 10 years |
0.68%
|
0.51%
|
|
|
Amortized cost After 10 years |
$ 297,566
|
$ 338,927
|
|
|
Gross Unrealized gains After 10 years |
3,595
|
7,091
|
|
|
Gross Unrealized losses After 10 years |
11,611
|
2,174
|
|
|
Allowance for Credit Losses After 10 years |
0
|
0
|
|
|
Fair value After 10 years |
$ 289,550
|
$ 343,844
|
|
|
Weighted-average yield After 10 years |
1.69%
|
1.45%
|
|
|
Amortized cost |
$ 347,796
|
$ 382,914
|
|
|
Gross unrealized gain |
3,796
|
7,743
|
|
|
Gross unrealized loss |
12,973
|
2,313
|
|
|
Allowance for Credit Losses |
0
|
0
|
|
|
Fair value |
$ 338,619
|
$ 388,344
|
|
|
Weighted-average yield |
1.64%
|
1.45%
|
|
|
MBS [Member] | FNMA [Member] |
|
|
|
|
Schedule Of Available For Sale Securities [Line Items] |
|
|
|
|
Amortized cost Due within one year |
$ 4,935
|
$ 4,975
|
|
|
Gross Unrealized gains Due within one year |
0
|
21
|
|
|
Gross Unrealized losses Due within one year |
6
|
0
|
|
|
Allowance for Credit Losses within one year |
0
|
0
|
|
|
Fair value Due within one year |
$ 4,929
|
$ 4,996
|
|
|
Weighted-average yield Due within one year |
1.92%
|
2.03%
|
|
|
Amortized cost After 1 to 5 years |
$ 16,108
|
$ 21,337
|
|
|
Gross Unrealized gains After 1 to 5 years |
194
|
424
|
|
|
Gross Unrealized losses After 1 to 5 years |
38
|
0
|
|
|
Allowance for Credit Losses After 1 to 5 years |
0
|
0
|
|
|
Fair value After 1 to 5 years |
$ 16,264
|
$ 21,761
|
|
|
Weighted-average yield After 1 to 5 years |
2.85%
|
2.87%
|
|
|
Amortized cost After 5 to 10 years |
$ 388,664
|
$ 298,771
|
|
|
Gross Unrealized gains After 5 to 10 years |
185
|
4,387
|
|
|
Gross Unrealized losses After 5 to 10 years |
14,483
|
1,917
|
|
|
Allowance for Credit Losses After 5 to 10 years |
0
|
0
|
|
|
Fair value After 5 to 10 years |
$ 374,366
|
$ 301,241
|
|
|
Weighted-average yield After 5 to 10 years |
1.49%
|
1.41%
|
|
|
Amortized cost After 10 years |
$ 1,382,595
|
$ 1,389,381
|
|
|
Gross Unrealized gains After 10 years |
1,339
|
8,953
|
|
|
Gross Unrealized losses After 10 years |
97,180
|
21,747
|
|
|
Allowance for Credit Losses After 10 years |
0
|
0
|
|
|
Fair value After 10 years |
$ 1,286,754
|
$ 1,376,587
|
|
|
Weighted-average yield After 10 years |
1.31%
|
1.21%
|
|
|
Amortized cost |
$ 1,792,302
|
$ 1,714,464
|
|
|
Gross unrealized gain |
1,718
|
13,785
|
|
|
Gross unrealized loss |
111,707
|
23,664
|
|
|
Allowance for Credit Losses |
0
|
0
|
|
|
Fair value |
$ 1,682,313
|
$ 1,704,585
|
|
|
Weighted-average yield |
1.36%
|
1.27%
|
|
|
MBS [Member] | Collateralized mortgage obligations guaranteed by FHLMC, FNMA and GNMA [Member] |
|
|
|
|
Schedule Of Available For Sale Securities [Line Items] |
|
|
|
|
Amortized cost Due within one year |
$ 68
|
|
|
|
Gross Unrealized gains Due within one year |
0
|
|
|
|
Gross Unrealized losses Due within one year |
0
|
|
|
|
Allowance for Credit Losses within one year |
0
|
|
|
|
Fair value Due within one year |
$ 68
|
|
|
|
Weighted-average yield Due within one year |
1.12%
|
|
|
|
Amortized cost After 1 to 5 years |
$ 35,157
|
$ 24,007
|
|
|
Gross Unrealized gains After 1 to 5 years |
50
|
1
|
|
|
Gross Unrealized losses After 1 to 5 years |
2,008
|
778
|
|
|
Allowance for Credit Losses After 1 to 5 years |
0
|
0
|
|
|
Fair value After 1 to 5 years |
$ 33,199
|
$ 23,230
|
|
|
Weighted-average yield After 1 to 5 years |
1.25%
|
1.31%
|
|
|
Amortized cost After 5 to 10 years |
|
$ 14,316
|
|
|
Gross Unrealized gains After 5 to 10 years |
|
97
|
|
|
Gross Unrealized losses After 5 to 10 years |
|
0
|
|
|
Allowance for Credit Losses After 5 to 10 years |
|
0
|
|
|
Fair value After 5 to 10 years |
|
$ 14,413
|
|
|
Weighted-average yield After 5 to 10 years |
|
0.76%
|
|
|
Amortized cost After 10 years |
$ 467,368
|
$ 500,811
|
|
|
Gross Unrealized gains After 10 years |
82
|
290
|
|
|
Gross Unrealized losses After 10 years |
38,373
|
13,134
|
|
|
Allowance for Credit Losses After 10 years |
0
|
0
|
|
|
Fair value After 10 years |
$ 429,077
|
$ 487,967
|
|
|
Weighted-average yield After 10 years |
1.21%
|
1.23%
|
|
|
Amortized cost |
$ 502,593
|
$ 539,134
|
|
|
Gross unrealized gain |
132
|
388
|
|
|
Gross unrealized loss |
40,381
|
13,912
|
|
|
Allowance for Credit Losses |
0
|
0
|
|
|
Fair value |
$ 462,344
|
$ 525,610
|
|
|
Weighted-average yield |
1.22%
|
1.22%
|
|
|
MBS [Member] | Private label [Member] |
|
|
|
|
Schedule Of Available For Sale Securities [Line Items] |
|
|
|
|
Amortized cost After 10 years |
$ 9,526
|
$ 9,994
|
|
|
Gross Unrealized gains After 10 years |
0
|
0
|
|
|
Gross Unrealized losses After 10 years |
2,203
|
1,963
|
|
|
Allowance for Credit Losses After 10 years |
403
|
797
|
|
|
Fair value After 10 years |
$ 6,920
|
$ 7,234
|
|
|
Weighted-average yield After 10 years |
2.96%
|
2.21%
|
|
|
Gross unrealized loss |
$ 2,600
|
|
|
|
Allowance for Credit Losses |
403
|
$ 797
|
$ 875
|
$ 1,002
|
Fair value |
$ 6,900
|
|
|
|
Weighted-average yield |
2.96%
|
|
|
|
Other Debt Obligations [Member] |
|
|
|
|
Schedule Of Available For Sale Securities [Line Items] |
|
|
|
|
Amortized cost Due within one year |
$ 1,000
|
500
|
|
|
Gross Unrealized gains Due within one year |
0
|
0
|
|
|
Gross Unrealized losses Due within one year |
0
|
0
|
|
|
Allowance for Credit Losses within one year |
0
|
0
|
|
|
Fair value Due within one year |
$ 1,000
|
$ 500
|
|
|
Weighted-average yield Due within one year |
0.78%
|
0.72%
|
|
|
Amortized cost After 1 to 5 years |
|
$ 500
|
|
|
Gross Unrealized gains After 1 to 5 years |
|
0
|
|
|
Gross Unrealized losses After 1 to 5 years |
|
0
|
|
|
Allowance for Credit Losses After 1 to 5 years |
|
0
|
|
|
Fair value After 1 to 5 years |
|
$ 500
|
|
|
Weighted-average yield After 1 to 5 years |
|
0.84%
|
|
|
Amortized cost |
|
$ 1,000
|
|
|
Gross unrealized gain |
|
0
|
|
|
Gross unrealized loss |
|
0
|
|
|
Allowance for Credit Losses |
|
0
|
|
|
Fair value |
|
$ 1,000
|
|
|
Weighted-average yield |
|
0.78%
|
|
|