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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Securities Available for Sale
The amortized cost, gross unrealized gains and losses, and fair value of the Company’s AFS investment securities are as follows:
December 31, 2021Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Available for sale securities
U.S. agency mortgage-backed securities$335,803 $3,141 $4,589 $334,355 
U.S. Treasury securities21,394 13 125 21,282 
Asset-backed securities (1)
17,547 79 80 17,546 
Corporate debt securities (2)
12,310 143 109 12,344 
U.S. state and municipal securities1,611 81 5 1,687 
Non-agency commercial mortgage-backed securities1,170 20 — 1,190 
Certificates of deposit1,000 — 1 999 
Foreign government agency securities425 — — 425 
Commercial paper200 — — 200 
Other22 4 — 26 
Total available for sale securities$391,482 $3,481 $4,909 $390,054 
December 31, 2020
Available for sale securities
U.S. agency mortgage-backed securities$283,911 $7,005 $563 $290,353 
Asset-backed securities (1)
18,808 174 84 18,898 
Corporate debt securities (2)
12,408 388 — 12,796 
U.S. Treasury securities10,631 25 — 10,656 
U.S. state and municipal securities1,544 153 — 1,697 
Foreign government agency securities1,411 2 — 1,413 
Non-agency commercial mortgage-backed securities1,213 52 — 1,265 
Certificates of deposit300 — — 300 
Other22 — — 22 
Total available for sale securities$330,248 $7,799 $647 $337,400 
(1) Approximately 58% and 51% of asset-backed securities held as of December 31, 2021 and 2020, respectively, were Federal Family Education Loan Program Asset-Backed Securities. Asset-backed securities collateralized by credit card receivables represented approximately 30% and 36% of the asset-backed securities held as of December 31, 2021 and 2020, respectively.
(2) As of December 31, 2021 and 2020 approximately 31% and 46%, respectively of the total AFS in corporate debt securities were issued by institutions in the financial services industry.
Securities with Unrealized Losses, Aggregated by Category and Period of Continuous Unrealized Loss
Securities with unrealized losses, aggregated by category and period of continuous unrealized loss, of AFS investment securities are as follows:
Less than
12 months		12 months
or longer		Total
December 31, 2021Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Available for sale securities      
U.S. agency mortgage-backed securities$186,955 $3,216 $38,007 $1,373 $224,962 $4,589 
U.S. Treasury securities16,658 125 21 — 16,679 125 
Asset-backed securities6,093 58 2,708 22 8,801 80 
Corporate debt securities4,713 99 197 10 4,910 109 
Certificates of deposit799 1 — — 799 1 
U.S. state and municipal securities191 4 5 1 196 5 
Total$215,409 $3,503 $40,938 $1,406 $256,347 $4,909 
December 31, 2020     
Available for sale securities     
U.S. agency mortgage-backed securities$61,706 $551 $4,774 $12 $66,480 $563 
Asset-backed securities1,398 13 5,822 71 7,220 84 
Total$63,104 $564 $10,596 $83 $73,700 $647 
Securities with Unrealized Losses, Aggregated by Category and Period of Continuous Unrealized Loss
Securities with unrealized losses, aggregated by category and period of continuous unrealized loss, of AFS investment securities are as follows:
Less than
12 months		12 months
or longer		Total
December 31, 2021Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Available for sale securities      
U.S. agency mortgage-backed securities$186,955 $3,216 $38,007 $1,373 $224,962 $4,589 
U.S. Treasury securities16,658 125 21 — 16,679 125 
Asset-backed securities6,093 58 2,708 22 8,801 80 
Corporate debt securities4,713 99 197 10 4,910 109 
Certificates of deposit799 1 — — 799 1 
U.S. state and municipal securities191 4 5 1 196 5 
Total$215,409 $3,503 $40,938 $1,406 $256,347 $4,909 
December 31, 2020     
Available for sale securities     
U.S. agency mortgage-backed securities$61,706 $551 $4,774 $12 $66,480 $563 
Asset-backed securities1,398 13 5,822 71 7,220 84 
Total$63,104 $564 $10,596 $83 $73,700 $647 
Maturities of Securities Available for Sale
The maturities of AFS investment securities are as follows:
December 31, 2021Within
1 year		After 1 year through
5 years		After 5 years through
10 years		After
10 years		Total
U.S. agency mortgage-backed securities $3,483 $20,916 $71,705 $238,251 $334,355 
U.S. Treasury securities4,049 14,569 2,664 — 21,282 
Asset-backed securities— 4,922 3,003 9,621 17,546 
Corporate debt securities1,634 6,443 4,267 — 12,344 
U.S. state and municipal securities23 150 1,010 504 1,687 
Non-agency commercial mortgage-backed securities — — — 1,190 1,190 
Certificates of deposit300 699 — — 999 
Foreign government agency securities101 324 — — 425 
Commercial paper200 — — — 200 
Other— — — 26 26 
Total fair value$9,790 $48,023 $82,649 $249,592 $390,054 
Total amortized cost$9,761 $47,336 $82,556 $251,829 $391,482 
Weighted-average yield (1)
1.28 %1.89 %1.78 %1.11 %1.35 %
(1) The weighted-average yield is computed using the amortized cost at December 31, 2021.
Proceeds and Gross Realized Gains And Losses from Sales of Securities Available for Sale
Proceeds and gross realized gains and losses from sales of AFS investment securities are as follows:
Year Ended December 31,202120202019
Proceeds$13,306 $4,801 $24,495 
Gross realized gains40 5 16 
Gross realized losses36 1 10