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INVESTMENT SECURITIES - Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 1,903,878 |  | $ 1,908,557 |
Noncredit Loss Component of OTTI Recorded in OCI | 5,731 |  | 22,372 |
Gross unrealized gain | 11,309 |  | 16,487 |
Gross unrealized loss | 18,440 |  | 20,752 |
Fair Value | $ 1,891,016 |  | $ 1,881,920 |
Weighted average yield | 2.27% |  | 2.14% |
United States And Puerto Rico Government Obligations [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 621,664 |  | $ 551,700 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 14,250 |
Gross unrealized gain | 193 |  | 233 |
Gross unrealized loss | 5,856 |  | 4,996 |
Fair Value | $ 616,001 |  | $ 532,687 |
Weighted average yield | 1.70% |  | 1.29% |
Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 1,281,690 |  | $ 1,356,342 |
Noncredit Loss Component of OTTI Recorded in OCI | 5,731 |  | 8,122 |
Gross unrealized gain | 11,116 |  | 16,254 |
Gross unrealized loss | 12,578 |  | 15,749 |
Fair Value | $ 1,274,497 |  | $ 1,348,725 |
Weighted average yield | 2.54% |  | 2.49% |
Federal Home Loan Mortgage Corporation Certificates And Obligations F H L M C [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 375,719 |  | $ 399,955 |
Fair Value | 370,855 |  | 394,249 |
Federal Home Loan Mortgage Corporation Certificates And Obligations F H L M C [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | 316,391 |  | 320,814 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 231 |  | 333 |
Gross unrealized loss | 4,916 |  | 5,827 |
Fair Value | $ 311,706 |  | $ 315,320 |
Weighted average yield | 2.23% |  | 2.17% |
Government National Mortgage Association Certificates And Obligations G N M A [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 250,140 |  | $ 254,495 |
Fair Value | 257,192 |  | 265,615 |
Government National Mortgage Association Certificates And Obligations G N M A [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | 214,809 |  | 215,375 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 7,155 |  | 11,344 |
Gross unrealized loss | 334 |  | 92 |
Fair Value | $ 221,630 |  | $ 226,627 |
Weighted average yield | 3.56% |  | 3.81% |
Federal National Mortgage Association Certificates And Obligations F N M A [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 801,198 |  | $ 849,584 |
Fair Value | 796,726 |  | 843,818 |
Federal National Mortgage Association Certificates And Obligations F N M A [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | 683,894 |  | 732,367 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 3,474 |  | 4,573 |
Gross unrealized loss | 7,328 |  | 9,667 |
Fair Value | $ 680,040 |  | $ 727,273 |
Weighted average yield | 2.39% |  | 2.33% |
Collateralized Mortgage Obligations [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 43,805 |  | $ 58,971 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 256 |  | 4 |
Gross unrealized loss | 0 |  | 163 |
Fair Value | $ 44,061 |  | $ 58,812 |
Weighted average yield | 2.22% |  | 1.43% |
Due Within One Year [Member] | U S Treasury Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost |  |  | $ 7,508 |
Noncredit Loss Component of OTTI Recorded in OCI |  |  | 0 |
Gross unrealized gain |  |  | 1 |
Gross unrealized loss |  |  | 0 |
Fair Value |  |  | $ 7,509 |
Weighted average yield |  |  | 0.57% |
Due Within One Year [Member] | US Government Sponsored Enterprises Debt Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 122,471 |  |  |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  |  |
Gross unrealized gain | 0 |  |  |
Gross unrealized loss | 319 |  |  |
Fair Value | $ 122,152 |  |  |
Weighted average yield | 1.06% |  |  |
Due Within One Year [Member] | Other Available For Sale Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 100 |  |  |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  |  |
Gross unrealized gain | 0 |  |  |
Gross unrealized loss | 0 |  |  |
Fair Value | $ 100 |  |  |
Weighted average yield | 1.48% |  |  |
Due Within One Year [Member] | Federal National Mortgage Association Certificates And Obligations F N M A [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost |  |  | $ 152 |
Noncredit Loss Component of OTTI Recorded in OCI |  |  | 0 |
Gross unrealized gain |  |  | 2 |
Gross unrealized loss |  |  | 0 |
Fair Value |  |  | $ 154 |
Weighted average yield |  |  | 4.71% |
After One To Five Years [Member] | U S Treasury Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 7,458 |  |  |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  |  |
Gross unrealized gain | 0 |  |  |
Gross unrealized loss | 57 |  |  |
Fair Value | $ 7,401 |  |  |
Weighted average yield | 1.29% |  |  |
After One To Five Years [Member] | US Government Sponsored Enterprises Debt Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 309,472 |  | $ 440,438 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 28 |  | 142 |
Gross unrealized loss | 3,735 |  | 2,912 |
Fair Value | $ 305,765 |  | $ 437,668 |
Weighted average yield | 1.42% |  | 1.33% |
After One To Five Years [Member] | Puerto Rico Government Obligations [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost |  |  | $ 21,422 |
Noncredit Loss Component of OTTI Recorded in OCI |  |  | 12,222 |
Gross unrealized gain |  |  | 0 |
Gross unrealized loss |  |  | 0 |
Fair Value |  |  | $ 9,200 |
Weighted average yield |  |  | 0.00% |
After One To Five Years [Member] | Other Available For Sale Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost |  |  | $ 100 |
Noncredit Loss Component of OTTI Recorded in OCI |  |  | 0 |
Gross unrealized gain |  |  | 0 |
Gross unrealized loss |  |  | 0 |
Fair Value |  |  | $ 100 |
Weighted average yield |  |  | 1.50% |
After One To Five Years [Member] | Government National Mortgage Association Certificates And Obligations G N M A [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 81 |  | $ 83 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 1 |  | 3 |
Gross unrealized loss | 0 |  | 0 |
Fair Value | $ 82 |  | $ 86 |
Weighted average yield | 3.23% |  | 3.82% |
After One To Five Years [Member] | Federal National Mortgage Association Certificates And Obligations F N M A [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 20,831 |  | $ 24,409 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 294 |  | 435 |
Gross unrealized loss | 109 |  | 0 |
Fair Value | $ 21,016 |  | $ 24,844 |
Weighted average yield | 2.69% |  | 2.18% |
After One To Five Years [Member] | Collateralized Mortgage Obligations [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 5,918 |  | $ 19,851 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 14 |  | 4 |
Gross unrealized loss | 0 |  | 31 |
Fair Value | $ 5,932 |  | $ 19,824 |
Weighted average yield | 2.21% |  | 1.42% |
After Five To Ten Years [Member] | US Government Sponsored Enterprises Debt Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 133,451 |  | $ 16,942 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 117 |  | 9 |
Gross unrealized loss | 319 |  | 256 |
Fair Value | $ 133,249 |  | $ 16,695 |
Weighted average yield | 2.72% |  | 1.91% |
After Five To Ten Years [Member] | Puerto Rico Government Obligations [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 4,071 |  |  |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  |  |
Gross unrealized gain | 47 |  |  |
Gross unrealized loss | 0 |  |  |
Fair Value | $ 4,118 |  |  |
Weighted average yield | 3.14% |  |  |
After Five To Ten Years [Member] | Federal Home Loan Mortgage Corporation Certificates And Obligations F H L M C [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 18,658 |  | $ 5,908 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 14 |  | 72 |
Gross unrealized loss | 63 |  | 0 |
Fair Value | $ 18,609 |  | $ 5,980 |
Weighted average yield | 2.14% |  | 2.25% |
After Five To Ten Years [Member] | Government National Mortgage Association Certificates And Obligations G N M A [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 69,661 |  | $ 91,744 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 1,244 |  | 1,635 |
Gross unrealized loss | 0 |  | 92 |
Fair Value | $ 70,905 |  | $ 93,287 |
Weighted average yield | 3.05% |  | 3.06% |
After Five To Ten Years [Member] | Federal National Mortgage Association Certificates And Obligations F N M A [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 49,934 |  | $ 17,181 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 0 |  | 0 |
Gross unrealized loss | 818 |  | 261 |
Fair Value | $ 49,116 |  | $ 16,920 |
Weighted average yield | 1.83% |  | 1.87% |
After Five To Ten Years [Member] | Collateralized Mortgage Obligations [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 2,556 |  |  |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  |  |
Gross unrealized gain | 11 |  |  |
Gross unrealized loss | 0 |  |  |
Fair Value | $ 2,567 |  |  |
Weighted average yield | 2.23% |  |  |
After Ten Years [Member] | US Government Sponsored Enterprises Debt Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 40,769 |  | $ 44,145 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 1 |  | 8 |
Gross unrealized loss | 149 |  | 166 |
Fair Value | $ 40,621 |  | $ 43,987 |
Weighted average yield | 1.84% |  | 1.12% |
After Ten Years [Member] | Puerto Rico Government Obligations [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 3,972 |  | $ 21,245 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 2,028 |
Gross unrealized gain | 0 |  | 73 |
Gross unrealized loss | 1,277 |  | 1,662 |
Fair Value | $ 2,695 |  | $ 17,628 |
Weighted average yield | 6.97% |  | 1.86% |
After Ten Years [Member] | Federal Home Loan Mortgage Corporation Certificates And Obligations F H L M C [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 297,733 |  | $ 314,906 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 217 |  | 261 |
Gross unrealized loss | 4,853 |  | 5,827 |
Fair Value | $ 293,097 |  | $ 309,340 |
Weighted average yield | 2.23% |  | 2.17% |
After Ten Years [Member] | Government National Mortgage Association Certificates And Obligations G N M A [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 145,067 |  | $ 123,548 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 5,910 |  | 9,706 |
Gross unrealized loss | 334 |  | 0 |
Fair Value | $ 150,643 |  | $ 133,254 |
Weighted average yield | 3.81% |  | 4.36% |
After Ten Years [Member] | Federal National Mortgage Association Certificates And Obligations F N M A [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 613,129 |  | $ 690,625 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 3,180 |  | 4,136 |
Gross unrealized loss | 6,401 |  | 9,406 |
Fair Value | $ 609,908 |  | $ 685,355 |
Weighted average yield | 2.43% |  | 2.35% |
After Ten Years [Member] | Collateralized Mortgage Obligations [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 35,331 |  | $ 39,120 |
Noncredit Loss Component of OTTI Recorded in OCI | 0 |  | 0 |
Gross unrealized gain | 231 |  | 0 |
Gross unrealized loss | 0 |  | 132 |
Fair Value | $ 35,562 |  | $ 38,988 |
Weighted average yield | 2.22% |  | 1.44% |
After Ten Years [Member] | Mortgage Backed Securities Issued By Private Enterprises [Member] | Mortgage Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 22,791 |  | $ 28,815 |
Noncredit Loss Component of OTTI Recorded in OCI | 5,731 |  | 8,122 |
Gross unrealized gain | 0 |  | 0 |
Gross unrealized loss | 0 |  | 0 |
Fair Value | $ 17,060 |  | $ 20,693 |
Weighted average yield | 2.44% |  | 2.40% |
Equity Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized cost | $ 424 | [1] | $ 415 | [2]
Noncredit Loss Component of OTTI Recorded in OCI | 0 | [1] | 0 | [2]
Gross unrealized gain | 0 | [1] | 0 | [2]
Gross unrealized loss | 6 | [1] | 7 | [2]
Fair Value | $ 418 | [1] | $ 408 | [2]
Weighted average yield | 2.11% | [1] | 2.44% | [2]
[1] | (1) Equity securities consisted of investment in a Community Reinvestment Act Qualified Investment Fund.
[2] | (1) Equity securities consisted of investment in a Community Reinvestment Act Qualified Investment Fund.

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