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INVESTMENT SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Debt Securities, Available-for-sale
The following tables present the amortized cost, gross unrealized gains and losses and approximate fair values of investments in debt securities AFS at the dates indicated:
 September 30, 2020December 31, 2019
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Loss		Fair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Loss		Fair
Value
U.S. Treasury securities$212,609 $3,045 $— $215,654 $4,086,733 $4,497 $(292)$4,090,938 
Corporate debt securities172,845 78 (15)172,908 139,696 39 (22)139,713 
ABS111,577 854 (1,290)111,141 138,839 1,034 (1,473)138,400 
State and municipal securities3 — — 3 9 — — 9 
MBS:        
GNMA - Residential3,322,848 84,241 (194)3,406,895 4,868,512 12,895 (16,066)4,865,341 
GNMA - Commercial1,413,584 26,142 (193)1,439,533 773,889 6,954 (1,785)779,058 
FHLMC and FNMA - Residential5,587,145 78,402 (5,670)5,659,877 4,270,426 14,296 (30,325)4,254,397 
FHLMC and FNMA - Commercial66,699 6,264 (2)72,961 69,242 2,665 (5)71,902 
Total investments in debt securities AFS$10,887,310 $199,026 $(7,364)$11,078,972 $14,347,346 $42,380 $(49,968)$14,339,758 
Summary of Held-to-maturity Securities
The following tables present the amortized cost, gross unrealized gains and losses and approximate fair values of investments in debt securities HTM at the dates indicated:
 September 30, 2020December 31, 2019
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Loss		Fair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Loss		Fair
Value
ABS$50,381 $561 $— $50,942 $— $— $— $— 
MBS:   
GNMA - Residential2,156,473 50,005 (801)2,205,677 1,948,025 11,354 (7,670)1,951,709 
GNMA - Commercial3,281,722 130,690 (140)3,412,272 1,990,772 20,115 (5,369)2,005,518 
Total investments in debt securities HTM$5,488,576 $181,256 $(941)$5,668,891 $3,938,797 $31,469 $(13,039)$3,957,227 
Investments Classified by Contractual Maturity Date
Contractual maturities of the Company’s investments in debt securities AFS at September 30, 2020 were as follows:
(in thousands)Amortized CostFair Value
Due within one year $349,080 $349,831 
Due after 1 year but within 5 years115,239 119,460 
Due after 5 years but within 10 years353,072 368,100 
Due after 10 years10,069,919 10,241,581 
Total$10,887,310 $11,078,972 

Contractual maturities of the Company’s investments in debt securities HTM at September 30, 2020 were as follows:
(in thousands)Amortized CostFair Value
Due within one year $2,483 $3,416 
Due after 1 year but within 5 years34,178 34,320 
Due after 5 years but within 10 years12,787 13,206 
Due after 10 years5,439,128 5,617,949 
Total$5,488,576 $5,668,891 
Gross Unrealized Loss and Fair Value of Debt Securities Available-for-Sale
The following table presents the aggregate amount of unrealized losses as of September 30, 2020 and December 31, 2019 on debt securities in the Company’s AFS investment portfolios classified according to the amount of time those securities have been in a continuous loss position:
 September 30, 2020December 31, 2019
 Less than 12 months12 months or longerLess than 12 months12 months or longer
(in thousands)Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
U.S. Treasury securities$— $— $— $— $200,096 $(167)$499,883 $(125)
Corporate debt securities131,377 (15)— — 110,802 (22)— — 
ABS4,013 (17)46,649 (1,273)27,662 (44)47,616 (1,429)
MBS:        
GNMA - Residential51,846 (178)10,756 (16)2,053,763 (6,895)997,024 (9,171)
GNMA - Commercial52,123 (193)— — 217,291 (1,756)14,300 (29)
FHLMC and FNMA - Residential1,416,139 (5,456)24,369 (214)660,078 (4,110)1,344,057 (26,215)
FHLMC and FNMA - Commercial— — 422 (2)— — 430 (5)
Total investments in debt securities AFS$1,655,498 $(5,859)$82,196 $(1,505)$3,269,692 $(12,994)$2,903,310 $(36,974)
Gross Unrealized Loss and Fair Value of Debt Securities Held-to-maturity
The following table presents the aggregate amount of unrealized losses as of September 30, 2020 and December 31, 2019 on debt securities in the Company’s HTM investment portfolios classified according to the amount of time those securities have been in a continuous loss position:
September 30, 2020December 31, 2019
Less than 12 months12 months or longerLess than 12 months12 months or longer
(in thousands)Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
MBS:
GNMA - Residential$168,035 $(801)$— $— $559,058 $(2,004)$657,733 $(5,666)
GNMA - Commercial67,237 (140)— — 731,445 (5,369)— — 
Total investments in debt securities HTM$235,272 $(941)$— $— $1,290,503 $(7,373)$657,733 $(5,666)
Gains (Losses) and Proceeds on Sales of Investment Securities
Proceeds from sales of investments in debt securities and the realized gross gains and losses from those sales were as follows:
Three-Month Period Ended September 30,Nine-Month Period Ended September 30,
(in thousands)2020201920202019
Proceeds from the sales of AFS securities$1,112,033 $416,981 $2,665,593 $1,044,645 
Gross realized gains$573 $2,667 $33,400 $6,007 
Gross realized losses(721)(400)(1,754)(3,361)
    Net realized gains/(losses) (1)
$(148)$2,267 $31,646 $2,646 
(1)    Includes net realized gain/(losses) on trading securities of $(0.1) million and $(1.0) million for the three-month and nine-month periods ended September 30, 2020, respectively, and $(0.3) million and $(0.6) million for the three-month and nine-month periods ended September 30, 2019, respectively.
Schedule of Other Investments
Other investments consisted of the following as of:
(in thousands)September 30, 2020December 31, 2019
FHLB of Pittsburgh and FRB stock$550,164 $716,615 
LIHTC investments300,588 265,271 
Equity securities not held for trading (1)
14,490 12,697 
Interest-bearing deposits with an affiliate bank750,000 — 
Trading securities42,464 1,097 
Total$1,657,706 $995,680 
(1)    Includes $1.4 million and zero of equity certificates related to an off-balance sheet securitization as of September 30, 2020 and December 31, 2019, respectively.