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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost and Approximate Fair Value of Investment Securities The amortized cost and fair value of investment securities as of June 30, 2021 and December 31, 2020 are summarized in the tables below:
 
June 30, 2021 (1)
(amounts in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Available for sale debt securities:
Asset-backed securities$319,682 $3,649 $(377)$322,954 
U.S. government agencies securities20,000 114 — 20,114 
Agency-guaranteed residential mortgage-backed securities 10,620 — (265)10,355 
Agency-guaranteed commercial mortgage-backed securities 2,206 — (1)2,205 
Agency-guaranteed residential collateralized mortgage obligations81,007 813 (62)81,758 
Agency-guaranteed commercial collateralized mortgage obligations144,593 — (1,752)142,841 
Collateralized loan obligations162,960 148 (181)162,927 
Commercial mortgage-backed securities23,054 33 — 23,087 
Corporate notes (2)
345,909 4,974 (462)350,421 
Private label collateralized mortgage obligations401,949 922 (1,295)401,576 
State and political subdivision debt securities (3)
8,543 11 — 8,554 
Available for sale debt securities$1,520,523 $10,664 $(4,395)$1,526,792 
 
December 31, 2020 (1)
(amounts in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Available for sale debt securities:
Asset-backed securities$372,640 $4,515 $(10)$377,145 
U.S. government agencies securities20,000 34 — 20,034 
Agency-guaranteed residential mortgage-backed securities 61,178 1,913 — 63,091 
Agency-guaranteed residential collateralized mortgage obligations139,985 916 (60)140,841 
Agency-guaranteed commercial collateralized mortgage obligations20,965 — (39)20,926 
Collateralized loan obligations32,367 — — 32,367 
Corporate notes (2)
372,764 24,144 (164)396,744 
Private label collateralized mortgage obligations136,943 423 (374)136,992 
State and political subdivision debt securities (3)
17,346 945 — 18,291 
Available for sale debt securities$1,174,188 $32,890 $(647)1,206,431 
Equity securities (4)
3,854 
Total investment securities, at fair value$1,210,285 
(1)Accrued interest on AFS debt securities totaled $5.0 million and $4.2 million at June 30, 2021 and December 31, 2020, respectively, and is included in accrued interest receivable on the consolidated balance sheet.
(2)Includes corporate securities issued by domestic bank holding companies.
(3)Includes both taxable and non-taxable municipal securities.
(4)Includes equity securities issued by a foreign entity.
Summary of Available-for-Sale Debt Securities by Stated Maturity The following table shows debt securities by stated maturity. Debt securities backed by mortgages and other assets have expected maturities that differ from contractual maturities because borrowers have the right to call or prepay and, therefore, these debt securities are classified separately with no specific maturity date:
 June 30, 2021
(amounts in thousands)Amortized
Cost		Fair
Value
Due in one year or less$4,901 $5,032 
Due after one year through five years211,508 212,586 
Due after five years through ten years154,043 157,219 
Due after ten years4,000 4,252 
Asset-backed securities319,682 322,954 
Collateralized loan obligations162,960 162,927 
Commercial mortgage-backed securities23,054 23,087 
Agency-guaranteed residential mortgage-backed securities10,620 10,355 
Agency-guaranteed commercial mortgage-backed securities2,206 2,205 
Agency-guaranteed residential collateralized mortgage obligations81,007 81,758 
Agency-guaranteed commercial collateralized mortgage obligations144,593 142,841 
Private label collateralized mortgage obligations401,949 401,576 
Total debt securities$1,520,523 $1,526,792 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value Gross unrealized losses and fair value of Customers' AFS debt securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2021 were as follows:
 June 30, 2021
 Less Than 12 Months12 Months or MoreTotal
(amounts in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Available for sale debt securities:
Asset-backed securities$61,515 $(377)$— $— $61,515 $(377)
Agency-guaranteed residential mortgage-backed securities 10,355 (265)— — 10,355 (265)
Agency-guaranteed commercial mortgage-backed securities 2,205 (1)— — 2,205 (1)
Agency-guaranteed residential collateralized mortgage obligations18,158 (62)— — 18,158 (62)
Agency-guaranteed commercial collateralized mortgage obligations142,841 (1,752)— — 142,841 (1,752)
Collateralized loan obligations101,555 (181)— — 101,555 (181)
Corporate notes 67,230 (462)— — 67,230 (462)
Private label collateralized mortgage obligations157,470 (1,295)— — 157,470 (1,295)
Total$561,329 $(4,395)$— $— $561,329 $(4,395)