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Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Amortized Cost    
Available for Sale, Due in one year or less $ 3,045  
Available for Sale, Due after one year through five years 24,894  
Available for Sale, Due after five years through ten years 295,533  
Available for Sale, Due after ten years 215,505  
Available for Sale, Total debt securities 538,977  
Available for Sale, amortized cost 3,414,042 $ 4,041,902
Fair Value    
Available for Sale, Due in one year or less 3,049  
Available for Sale, Due after one year through five years 25,227  
Available for Sale, Due after five years through ten years 304,383  
Available for Sale, Due after ten years 223,752  
Available for Sale, Total debt securities 556,411  
Investment securities available for sale, at fair value(a) [1] $ 3,436,289 3,946,941
Available for Sale, Ratio of Fair Value to Amortized Cost 100.70%  
Amortized Cost    
Held to Maturity, Due in one year or less $ 29,063  
Held to Maturity, Due after one year through five years 91,045  
Held to Maturity, Due after five years through ten years 128,365  
Held to Maturity, Due after ten years 1,098,760  
Held to Maturity, Total Debt Securities 1,347,233  
Held to Maturity, Amortized Cost [1] 2,200,419 2,740,511
Fair Value    
Held to Maturity, Due in one year or less 29,208  
Held to Maturity, Due after one year through five years 92,075  
Held to Maturity, Due after five years through ten years 132,716  
Held to Maturity, Due after ten years 1,165,757  
Held to Maturity, Securities, Debt Securities 1,419,755  
Held to Maturity, Total debt securities at fair value $ 2,281,285 2,710,271
Held to Maturity, Ratio of Fair Value to Amortized Cost 103.70%  
Private-label    
Amortized Cost    
Available for Sale, amortized cost $ 749 1,007
Fair Value    
Investment securities available for sale, at fair value(a) 758 1,003
Amortized Cost    
Held to Maturity, Amortized Cost 0  
Fair Value    
Held to Maturity, Total debt securities at fair value 0  
FFELP asset backed securities    
Amortized Cost    
Available for Sale, amortized cost 272,871 297,347
Fair Value    
Investment securities available for sale, at fair value(a) 269,789 297,360
Amortized Cost    
Held to Maturity, Amortized Cost 0  
Fair Value    
Held to Maturity, Total debt securities at fair value 0  
FNMA/FHLMC | Residential Related Securities    
Amortized Cost    
Available for Sale, amortized cost 141,678 296,296
Fair Value    
Investment securities available for sale, at fair value(a) 143,009 295,252
Amortized Cost    
Held to Maturity, Amortized Cost 86,140 92,788
Fair Value    
Held to Maturity, Total debt securities at fair value 87,590 91,162
FNMA/FHLMC | Commercial mortgage-related securities    
Amortized Cost    
Available for Sale, amortized cost 19,996  
Fair Value    
Investment securities available for sale, at fair value(a) 21,791  
Amortized Cost    
Held to Maturity, Amortized Cost 0  
Fair Value    
Held to Maturity, Total debt securities at fair value 0  
GNMA | Residential Related Securities    
Amortized Cost    
Available for Sale, amortized cost 1,075,922 2,169,943
Fair Value    
Investment securities available for sale, at fair value(a) 1,080,584 2,128,531
Amortized Cost    
Held to Maturity, Amortized Cost 295,370 351,606
Fair Value    
Held to Maturity, Total debt securities at fair value 300,108 345,035
GNMA | Commercial mortgage-related securities    
Amortized Cost    
Available for Sale, amortized cost 1,363,848 1,273,309
Fair Value    
Investment securities available for sale, at fair value(a) 1,363,948 1,220,797
Amortized Cost    
Held to Maturity, Amortized Cost 471,675 505,434
Fair Value    
Held to Maturity, Total debt securities at fair value $ 473,832 $ 490,414
[1]
(a) As permitted by ASU 2019-04, which was adopted during the third quarter of 2019, the Corporation made a one-time election to transfer municipal securities with a book value of $692 million from held to maturity to available for sale.