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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |
Gain (Loss) on Securities | The following table presents gross realized gains and realized losses from the sale of AFS debt securities for the years ended December 31, 2022, 2021 and 2020:
| For the Years Ended December 31,
(amounts in thousands) | 2022 |  | 2021 |  | 2020
Gross realized gains | $ | 3,087 |  |  | $ | 31,392 |  |  | $ | 20,078 |
Gross realized losses | (26,251) |  |  | — |  |  | — |
Net realized gain (loss) on sale of available for sale debt securities | $ | (23,164) |  |  | $ | 31,392 |  |  | $ | 20,078 |
Summary of Investment Securities by Stated Maturity | The following table presents AFS 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:
| December 31, 2022
(amounts in thousands) | Amortized Cost |  | Fair Value
Due in one year or less | $ | 21,465 |  |  | $ | 21,499 |
Due after one year through five years | 507,162 |  |  | 460,649 |
Due after five years through ten years | 128,459 |  |  | 113,105 |
Asset-backed securities | 169,170 |  |  | 160,542 |
Collateralized loan obligations | 896,992 |  |  | 872,738 |
Commercial mortgage-backed securities | 142,222 |  |  | 136,357 |
Agency-guaranteed residential collateralized mortgage obligations | 147,481 |  |  | 133,864 |
Private label collateralized mortgage obligations | 1,125,583 |  |  | 1,062,261 |
Total available for sale debt securities | $ | 3,138,534 |  |  | $ | 2,961,015 |
The following table presents HTM 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:
| December 31, 2022
(amounts in thousands) | Amortized Cost |  | Fair Value
Asset-backed securities | 361,107 |  |  | 356,133 |
Agency-guaranteed residential mortgage-backed securities | 7,189 |  |  | 6,626 |
Agency-guaranteed commercial mortgage-backed securities | 1,928 |  |  | 1,824 |
Agency-guaranteed residential collateralized mortgage obligations | 204,495 |  |  | 186,119 |
Agency-guaranteed commercial collateralized mortgage obligations | 151,711 |  |  | 142,276 |
Private label collateralized mortgage obligations | 113,829 |  |  | 100,835 |
Total held to maturity debt securities | $ | 840,259 |  |  | $ | 793,813 |
Gross Unrealized Losses and Fair Value, Aggregated by Investment Category | The amortized cost and approximate fair value and allowance for credit losses of investment securities as of December 31, 2022 and 2021 are summarized as follows:
| December 31, 2022 (1)
(amounts in thousands) | Amortized Cost |  | Allowance for Credit Losses |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available for sale debt securities |  |  |  |  |  |  |  |  |
Asset-backed securities | $ | 169,170 |  |  | $ | (578) |  |  | $ | — |  |  | $ | (8,050) |  |  | $ | 160,542 |
Agency-guaranteed residential collateralized mortgage obligations | 147,481 |  |  | — |  |  | — |  |  | (13,617) |  |  | 133,864 |
Collateralized loan obligations | 896,992 |  |  | — |  |  | 88 |  |  | (24,342) |  |  | 872,738 |
Commercial mortgage-backed securities | 142,222 |  |  | — |  |  | 1 |  |  | (5,866) |  |  | 136,357 |
Corporate notes | 657,086 |  |  | — |  |  | 45 |  |  | (61,878) |  |  | 595,253 |
Private label collateralized mortgage obligations | 1,125,583 |  |  | — |  |  | 308 |  |  | (63,630) |  |  | 1,062,261 |
Available for sale debt securities | $ | 3,138,534 |  |  | $ | (578) |  |  | $ | 442 |  |  | $ | (177,383) |  |  | 2,961,015 |
Equity securities (3) |  |  |  |  |  |  |  |  | 26,485 |
Total investment securities, at fair value |  |  |  |  |  |  |  |  | $ | 2,987,500 |
| December 31, 2021 (1)
(amounts in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available for sale debt securities |  |  |  |  |  |  |
Asset-backed securities | $ | 297,291 |  |  | $ | 253 |  |  | $ | (119) |  |  | $ | 297,425 |
Agency-guaranteed residential mortgage-backed securities | 9,865 |  |  | — |  |  | (312) |  |  | 9,553 |
Agency-guaranteed commercial mortgage-backed securities | 2,162 |  |  | — |  |  | (10) |  |  | 2,152 |
Agency-guaranteed residential collateralized mortgage obligations | 199,091 |  |  | 154 |  |  | (2,315) |  |  | 196,930 |
Agency-guaranteed commercial collateralized mortgage obligations | 242,668 |  |  | 53 |  |  | (3,877) |  |  | 238,844 |
Collateralized loan obligations | 1,067,770 |  |  | 247 |  |  | (1,215) |  |  | 1,066,802 |
Commercial mortgage-backed securities | 149,054 |  |  | 53 |  |  | (180) |  |  | 148,927 |
Corporate notes | 575,273 |  |  | 6,334 |  |  | (1,561) |  |  | 580,046 |
Private label collateralized mortgage obligations | 1,248,142 |  |  | 333 |  |  | (6,010) |  |  | 1,242,465 |
State and political subdivision debt securities (2) | 8,535 |  |  | — |  |  | (104) |  |  | 8,431 |
Available for sale debt securities | $ | 3,799,851 |  |  | $ | 7,427 |  |  | $ | (15,703) |  |  | 3,791,575 |
Equity securities (3) |  |  |  |  |  |  | 25,575 |
Total investment securities, at fair value |  |  |  |  |  |  | $ | 3,817,150 |
(1)Accrued interest on AFS debt securities totaled $16.7 million and $11.0 million at December 31, 2022 and 2021, respectively, and is included in accrued interest receivable on the consolidated balance sheet. (2)Includes both taxable and non-taxable municipal securities. (3)Includes perpetual preferred stock issued by domestic banks and bank holding companies and equity securities issued by fintech companies, without a readily determinable fair value, and the CRA-qualified mutual fund shares at December 31, 2022 and 2021. No impairments or measurement adjustments have been recorded on the equity securities without a readily determinable fair value since acquisition. In 2019, Gross unrealized losses and fair value of Customers' AFS debt securities for which an allowance for credit losses has not been recorded, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2022 and 2021 were as follows:
| December 31, 2022
| Less than 12 months |  | 12 months or more |  | Total
(amounts in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Available for sale debt securities |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities | $ | 160,542 |  |  | $ | (8,050) |  |  | $ | — |  |  | $ | — |  |  | $ | 160,542 |  |  | $ | (8,050) |
Agency-guaranteed residential collateralized mortgage obligations | 133,864 |  |  | (13,617) |  |  | — |  |  | — |  |  | 133,864 |  |  | (13,617) |
Collateralized loan obligations | 386,701 |  |  | (13,516) |  |  | 315,270 |  |  | (10,826) |  |  | 701,971 |  |  | (24,342) |
Commercial mortgage-backed securities | 39,828 |  |  | (1,410) |  |  | 93,005 |  |  | (4,456) |  |  | 132,833 |  |  | (5,866) |
Corporate notes | 386,464 |  |  | (36,119) |  |  | 178,955 |  |  | (25,759) |  |  | 565,419 |  |  | (61,878) |
Private label collateralized mortgage obligations | 478,096 |  |  | (29,364) |  |  | 314,332 |  |  | (34,266) |  |  | 792,428 |  |  | (63,630) |
Total | $ | 1,585,495 |  |  | $ | (102,076) |  |  | $ | 901,562 |  |  | $ | (75,307) |  |  | $ | 2,487,057 |  |  | $ | (177,383) |
| December 31, 2021
| Less than 12 months |  | 12 months or more |  | Total
(amounts in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Available for sale debt securities |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities | $ | 54,753 |  |  | $ | (119) |  |  | $ | — |  |  | $ | — |  |  | $ | 54,753 |  |  | $ | (119) |
Agency-guaranteed residential mortgage-backed securities | 9,554 |  |  | (312) |  |  | — |  |  | — |  |  | 9,554 |  |  | (312) |
Agency-guaranteed commercial mortgage-backed securities | 2,152 |  |  | (10) |  |  | — |  |  | — |  |  | 2,152 |  |  | (10) |
Agency-guaranteed residential collateralized mortgage obligations | 173,492 |  |  | (2,315) |  |  | — |  |  | — |  |  | 173,492 |  |  | (2,315) |
Agency-guaranteed commercial collateralized mortgage obligations | 118,334 |  |  | (3,877) |  |  | — |  |  | — |  |  | 118,334 |  |  | (3,877) |
Collateralized loan obligations | 715,250 |  |  | (1,215) |  |  | — |  |  | — |  |  | 715,250 |  |  | (1,215) |
Commercial mortgage-backed securities | 122,597 |  |  | (180) |  |  | — |  |  | — |  |  | 122,597 |  |  | (180) |
Corporate notes | 188,100 |  |  | (1,561) |  |  | — |  |  | — |  |  | 188,100 |  |  | (1,561) |
Private label collateralized mortgage obligations | 632,091 |  |  | (5,874) |  |  | 6,818 |  |  | (136) |  |  | 638,909 |  |  | (6,010) |
State and political subdivision debt securities | 8,430 |  |  | (104) |  |  | — |  |  | — |  |  | 8,430 |  |  | (104) |
Total | $ | 2,024,753 |  |  | $ | (15,567) |  |  | $ | 6,818 |  |  | $ | (136) |  |  | $ | 2,031,571 |  |  | $ | (15,703) |
The amortized cost, approximate fair value and allowance for credit losses of investment securities held to maturity as of December 31, 2022 are summarized as follows:
| December 31, 2022 (1)
(amounts in thousands) | Amortized Cost |  | Allowance for Credit Losses |  | Net Carrying Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Held to maturity debt securities: |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities | $ | 361,107 |  |  | $ | — |  |  | $ | 361,107 |  |  | $ | — |  |  | $ | (4,974) |  |  | $ | 356,133 |
Agency-guaranteed residential mortgage-backed securities | 7,189 |  |  | — |  |  | 7,189 |  |  | — |  |  | (563) |  |  | $ | 6,626 |
Agency-guaranteed commercial mortgage-backed securities | 1,928 |  |  | — |  |  | 1,928 |  |  | — |  |  | (104) |  |  | $ | 1,824 |
Agency-guaranteed residential collateralized mortgage obligations | 204,495 |  |  | — |  |  | 204,495 |  |  | — |  |  | (18,376) |  |  | $ | 186,119 |
Agency-guaranteed commercial collateralized mortgage obligations | 151,711 |  |  | — |  |  | 151,711 |  |  | — |  |  | (9,435) |  |  | $ | 142,276 |
Private label collateralized mortgage obligations | 113,829 |  |  | — |  |  | 113,829 |  |  | — |  |  | (12,994) |  |  | $ | 100,835 |
Total held to maturity debt securities | $ | 840,259 |  |  | $ | — |  |  | $ | 840,259 |  |  | $ | — |  |  | $ | (46,446) |  |  | $ | 793,813 |
(1)Accrued interest on HTM debt securities totaled $1.0 million at December 31, 2022, and is included in accrued interest receivable on the consolidated balance sheet.
Debt Securities, Available-for-Sale, Allowance for Credit Loss | The following table presents the activity in the allowance for credit losses on AFS debt securities, by major security type, for the period presented:
| Asset-backed securities
(amounts in thousands) | For the Year Ended December 31, 2022
Balance at January 1, | $ | — |
Credit losses on securities for which credit losses were not previously recorded | 578 |
Balance at December 31, | $ | 578 |
Debt Securities, Held-to-Maturity, Credit Quality Indicator | The following table presents the amortized cost of HTM debt securities based on their lowest credit rating available:
| December 31, 2022
(amounts in thousands) | AAA |  | AA |  | A |  |  |  |  |  |  |  |  |  | BBB |  |  |  | Not Rated |  | Total
Held to maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities | $ | — |  |  | $ | — |  |  | $ | — |  |  |  |  |  |  |  |  |  |  | $ | — |  |  |  |  | $ | 361,107 |  |  | $ | 361,107 |
Agency-guaranteed residential mortgage-backed securities | — |  |  | — |  |  | — |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  | 7,189 |  |  | $ | 7,189 |
Agency-guaranteed commercial mortgage-backed securities | — |  |  | — |  |  | — |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  | 1,928 |  |  | $ | 1,928 |
Agency-guaranteed residential collateralized mortgage obligations | — |  |  | — |  |  | — |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  | 204,495 |  |  | $ | 204,495 |
Agency-guaranteed commercial collateralized mortgage obligations | — |  |  | — |  |  | — |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  | 151,711 |  |  | $ | 151,711 |
Private label collateralized mortgage obligations | 63,066 |  |  | 7,109 |  |  | 34,405 |  |  |  |  |  |  |  |  |  |  | 9,249 |  |  |  |  | — |  |  | $ | 113,829 |
Total held to maturity debt securities | $ | 63,066 |  |  | $ | 7,109 |  |  | $ | 34,405 |  |  |  |  |  |  |  |  |  |  | $ | 9,249 |  |  |  |  | $ | 726,430 |  |  | $ | 840,259 |

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