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INVESTMENT SECURITIES - Investment Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 1,753,629 $ 1,908,557
Noncredit Loss Component of OTTI Recorded in OCI 5,990 22,372
Gross unrealized gain 15,604 16,487
Gross unrealized loss 12,771 20,752
Fair value $ 1,750,472 $ 1,881,920
Weighted average yield 2.20% 2.14%
United States And Puerto Rico Government Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 506,161 $ 551,700
Noncredit Loss Component of OTTI Recorded in OCI 0 14,250
Gross unrealized gain 239 233
Gross unrealized loss 3,703 4,996
Fair value $ 502,697 $ 532,687
Weighted average yield 1.42% 1.29%
Mortgage Backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 1,246,946 $ 1,356,342
Noncredit Loss Component of OTTI Recorded in OCI 5,990 8,122
Gross unrealized gain 15,365 16,254
Gross unrealized loss 9,064 15,749
Fair value $ 1,247,257 $ 1,348,725
Weighted average yield 2.52% 2.49%
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 $ 287,155 $ 320,814
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 665 333
Gross unrealized loss 3,555 5,827
Fair value $ 284,265 $ 315,320
Weighted average yield 2.17% 2.17%
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 $ 225,592 $ 215,375
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 9,306 11,344
Gross unrealized loss 56 92
Fair value $ 234,842 $ 226,627
Weighted average yield 3.56% 3.81%
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 $ 654,891 $ 732,367
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 5,185 4,573
Gross unrealized loss 5,453 9,667
Fair value $ 654,623 $ 727,273
Weighted average yield 2.38% 2.33%
Collateralized Mortgage Obligations Issued And Guaranteed By Fhlmc Fnma And Gnma [Member] | Mortgage Backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 55,688 $ 58,971
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 209 4
Gross unrealized loss 0 163
Fair value $ 55,897 $ 58,812
Weighted average yield 1.89% 1.43%
Mortgage Backed Securities Issued By Private Enterprises [Member] | Mortgage Backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 23,620 $ 28,815
Noncredit Loss Component of OTTI Recorded in OCI 5,990 8,122
Gross unrealized gain 0 0
Gross unrealized loss 0 0
Fair value $ 17,630 $ 20,693
Weighted average yield 2.38% 2.40%
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 $ 97,465  
Noncredit Loss Component of OTTI Recorded in OCI 0  
Gross unrealized gain 0  
Gross unrealized loss 160  
Fair value $ 97,305  
Weighted average yield 1.05%  
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 1.49%  
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 $ 12 $ 152
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 0 2
Gross unrealized loss 0 0
Fair value $ 12 $ 154
Weighted average yield 1.85% 4.71%
After One To Five Years [Member] | U S Treasury Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 7,450  
Noncredit Loss Component of OTTI Recorded in OCI 0  
Gross unrealized gain 0  
Gross unrealized loss 18  
Fair value $ 7,432  
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 $ 334,476 $ 440,438
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 138 142
Gross unrealized loss 1,873 2,912
Fair value $ 332,741 $ 437,668
Weighted average yield 1.39% 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 $ 91 $ 83
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 2 3
Gross unrealized loss 0 0
Fair value $ 93 $ 86
Weighted average yield 3.07% 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 $ 19,563 $ 24,409
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 418 435
Gross unrealized loss 20 0
Fair value $ 19,961 $ 24,844
Weighted average yield 2.61% 2.18%
After One To Five Years [Member] | Collateralized Mortgage Obligations Issued And Guaranteed By Fhlmc Fnma And Gnma [Member] | Mortgage Backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost   $ 19,851
Noncredit Loss Component of OTTI Recorded in OCI   0
Gross unrealized gain   4
Gross unrealized loss   31
Fair value   $ 19,824
Weighted average yield   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 $ 16,943 $ 16,942
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 29 9
Gross unrealized loss 164 256
Fair value $ 16,808 $ 16,695
Weighted average yield 2.01% 1.91%
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 $ 20,074 $ 5,908
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 115 72
Gross unrealized loss 0 0
Fair value $ 20,189 $ 5,980
Weighted average yield 2.15% 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 $ 75,270 $ 91,744
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 1,621 1,635
Gross unrealized loss 0 92
Fair value $ 76,891 $ 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 $ 56,234 $ 17,181
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 6 0
Gross unrealized loss 489 261
Fair value $ 55,751 $ 16,920
Weighted average yield 1.86% 1.87%
After Five To Ten Years [Member] | Collateralized Mortgage Obligations Issued And Guaranteed By Fhlmc Fnma And Gnma [Member] | Mortgage Backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 18,874  
Noncredit Loss Component of OTTI Recorded in OCI 0  
Gross unrealized gain 28  
Gross unrealized loss 0  
Fair value $ 18,902  
Weighted average yield 1.88%  
After Ten Years [Member] | US Government Sponsored Enterprises Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 41,833 $ 44,145
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 0 8
Gross unrealized loss 193 166
Fair value $ 41,640 $ 43,987
Weighted average yield 1.60% 1.12%
After Ten Years [Member] | Puerto Rico Government obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 7,994 $ 21,245
Noncredit Loss Component of OTTI Recorded in OCI 0 2,028
Gross unrealized gain 72 73
Gross unrealized loss 1,295 1,662
Fair value $ 6,771 $ 17,628
Weighted average yield 5.01% 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 $ 267,081 $ 314,906
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 550 261
Gross unrealized loss 3,555 5,827
Fair value $ 264,076 $ 309,340
Weighted average yield 2.17% 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 $ 150,231 $ 123,548
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 7,683 9,706
Gross unrealized loss 56 0
Fair value $ 157,858 $ 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 $ 579,082 $ 690,625
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 4,761 4,136
Gross unrealized loss 4,944 9,406
Fair value $ 578,899 $ 685,355
Weighted average yield 2.42% 2.35%
After Ten Years [Member] | Collateralized Mortgage Obligations Issued And Guaranteed By Fhlmc Fnma And Gnma [Member] | Mortgage Backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 36,814 $ 39,120
Noncredit Loss Component of OTTI Recorded in OCI 0 0
Gross unrealized gain 181 0
Gross unrealized loss 0 132
Fair value $ 36,995 $ 38,988
Weighted average yield 1.90% 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 $ 23,620 $ 28,815
Noncredit Loss Component of OTTI Recorded in OCI 5,990 8,122
Gross unrealized gain 0 0
Gross unrealized loss 0 0
Fair value $ 17,630 $ 20,693
Weighted average yield 2.38% 2.40%
Equity Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 422 [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 4 [1] 7 [2]
Fair value $ 418 [1] $ 408 [2]
Weighted average yield 2.08% [1] 2.44% [2]
[1]
Equity securities consisted of an investment in a Community Reinvestment Act Qualified Investment Fund.
[2]
Equity securities consisted of an investment in a Community Reinvestment Act Qualified Investment Fund.