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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 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:
September 30, 2021Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. agency mortgage-backed securities$329,953 $4,228 $2,867 $331,314 
Asset-backed securities (1)
17,550 122 44 17,628 
Corporate debt securities (2)
12,453 225 79 12,599 
U.S. Treasury securities 11,518 14 55 11,477 
U.S. state and municipal securities1,617 87 2 1,702 
Non-agency commercial mortgage-backed securities1,192 31 — 1,223 
Certificates of deposit1,000 — 1 999 
Other22 4 — 26 
Total available for sale securities$375,305 $4,711 $3,048 $376,968 
December 31, 2020Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
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 securities 10,631 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 September 30, 2021 and December 31, 2020, respectively, were Federal Family Education Loan Program Asset-Backed Securities. Asset-backed securities collateralized by credit card receivables represented approximately 33% and 36% of the asset-backed securities held as of September 30, 2021 and December 31, 2020, respectively.
(2) As of September 30, 2021 and December 31, 2020, approximately 33% 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 months12 months or longerTotal
September 30, 2021Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Available for sale securities      
U.S. agency mortgage-backed securities$165,770 $2,426 $18,326 $441 $184,096 $2,867 
Corporate debt securities3,462 76 52 3 3,514 79 
Asset-backed securities2,893 21 2,848 23 5,741 44 
U.S. Treasury securities9,018 55 21 — 9,039 55 
U.S. state and municipal securities96 2 5 — 101 2 
Certificates of deposit499 1 — — 499 1 
Total$181,738 $2,581 $21,252 $467 $202,990 $3,048 
December 31, 2020   
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 months12 months or longerTotal
September 30, 2021Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Available for sale securities      
U.S. agency mortgage-backed securities$165,770 $2,426 $18,326 $441 $184,096 $2,867 
Corporate debt securities3,462 76 52 3 3,514 79 
Asset-backed securities2,893 21 2,848 23 5,741 44 
U.S. Treasury securities9,018 55 21 — 9,039 55 
U.S. state and municipal securities96 2 5 — 101 2 
Certificates of deposit499 1 — — 499 1 
Total$181,738 $2,581 $21,252 $467 $202,990 $3,048 
December 31, 2020   
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:
September 30, 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$3,353 $21,031 $67,278 $239,652 $331,314 
Asset-backed securities— 5,075 2,912 9,641 17,628 
Corporate debt securities1,621 6,815 4,163 — 12,599 
U.S. Treasury securities4,051 2,576 4,850 — 11,477 
U.S. state and municipal securities23 125 970 584 1,702 
Non-agency commercial mortgage-backed securities — — — 1,223 1,223 
Certificates of deposit300 699 — — 999 
Other— — — 26 26 
Total fair value$9,348 $36,321 $80,173 $251,126 $376,968 
Total amortized cost$9,311 $35,239 $79,456 $251,299 $375,305 
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:
Three Months Ended
September 30,		Nine Months Ended September 30,
2021202020212020
Proceeds$1,697 $2,825 $11,339 $2,895 
Gross realized gains2 4 39 4 
Gross realized losses2 1 25 1