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INVESTMENT SECURITIES (Tables)
 6 Months Ended
Jun. 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:
 June 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$1,505,434  $16,362  $(1) $1,521,795  $4,086,733  $4,497  $(292) $4,090,938  
Corporate debt securities98,389  110  (13) 98,486  139,696  39  (22) 139,713  
ABS113,611  983  (1,329) 113,265  138,839  1,034  (1,473) 138,400  
State and municipal securities5  —  —  5  9  —  —  9  
MBS:        
GNMA - Residential4,154,798  111,781  (161) 4,266,418  4,868,512  12,895  (16,066) 4,865,341  
GNMA - Commercial1,002,210  26,394  —  1,028,604  773,889  6,954  (1,785) 779,058  
FHLMC and FNMA - Residential4,866,733  78,804  (1,465) 4,944,072  4,270,426  14,296  (30,325) 4,254,397  
FHLMC and FNMA - Commercial68,821  6,460  (3) 75,278  69,242  2,665  (5) 71,902  
Total investments in debt securities AFS$11,810,001  $240,894  $(2,972) $12,047,923  $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:
 June 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$23,342  $353  $—  $23,695  $—  $—  $—  $—  
MBS:   
GNMA - Residential2,319,089  62,751  (930) 2,380,910  1,948,025  11,354  (7,670) 1,951,709  
GNMA - Commercial2,887,131  122,984  —  3,010,115  1,990,772  20,115  (5,369) 2,005,518  
Total investments in debt securities HTM$5,229,562  $186,088  $(930) $5,414,720  $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 June 30, 2020 were as follows:
(in thousands)Amortized CostFair Value
Due within one year $1,028,954  $1,033,024  
Due after 1 year but within 5 years656,560  671,008  
Due after 5 years but within 10 years424,030  439,653  
Due after 10 years9,700,457  9,904,238  
Total$11,810,001  $12,047,923  

Contractual maturities of the Company’s investments in debt securities HTM at June 30, 2020 were as follows:
(in thousands)Amortized CostFair Value
Due within one year $—  $—  
Due after 1 year but within 5 years17,207  17,307  
Due after 5 years but within 10 years6,135  6,388  
Due after 10 years5,206,220  5,391,025  
Total$5,229,562  $5,414,720  
Gross Unrealized Loss and Fair Value of Debt Securities Available-for-Sale
The following table presents the aggregate amount of unrealized losses as of June 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:
 June 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$139,982  $(1) $—  $—  $200,096  $(167) $499,883  $(125) 
Corporate debt securities56,893  (13) —  —  110,802  (22) —  —  
ABS12,779  (69) 38,538  (1,260) 27,662  (44) 47,616  (1,429) 
MBS:        
GNMA - Residential21,157  (26) 28,479  (135) 2,053,763  (6,895) 997,024  (9,171) 
GNMA - Commercial—  —  —  —  217,291  (1,756) 14,300  (29) 
FHLMC and FNMA - Residential525,099  (1,177) 26,452  (288) 660,078  (4,110) 1,344,057  (26,215) 
FHLMC and FNMA - Commercial—  —  425  (3) —  —  430  (5) 
Total investments in debt securities AFS$755,910  $(1,286) $93,894  $(1,686) $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 June 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:
June 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$81,040  $(930) $—  $—  $559,058  $(2,004) $657,733  $(5,666) 
GNMA - Commercial—  —  —  —  731,445  (5,369) —  —  
Total investments in debt securities HTM$81,040  $(930) $—  $—  $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 June 30,Six-Month Period Ended June 30,
(in thousands)2020201920202019
Proceeds from the sales of AFS securities$631,459  $344,792  $1,553,560  $627,664  
Gross realized gains$22,516  $2,528  $32,829  $3,340  
Gross realized losses—  (149) (1,034) (2,961) 
    Net realized gains/(losses) (1)
$22,516  $2,379  $31,795  $379  
(1) Includes net realized gain/(losses) on trading securities of $0.5 million and $(0.9) million for the three-month and six-month periods ended June 30, 2020, respectively, and $(12.0) thousand and $(0.3) million for the three-month and six-month periods ended June 30, 2019, respectively.
Schedule of Other Investments
Other investments consisted of the following as of:
(in thousands)June 30, 2020December 31, 2019
FHLB of Pittsburgh and FRB stock$659,146  $716,615  
LIHTC investments285,932  265,271  
Equity securities not held for trading (1)
13,221  12,697  
Interest-bearing deposits with an affiliate bank750,000  —  
Trading securities19,766  1,097  
Total$1,728,065  $995,680  
(1) Includes $0.2 million and zero of equity certificates related to an off-balance sheet securitization as of June 30, 2020 and December 31, 2019, respectively.