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Investment Securities (Tables)
 6 Months Ended
Jun. 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:
June 30, 2021Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. agency mortgage-backed securities$312,045 $4,862 $2,139 $314,768 
Asset-backed securities (1)
17,436 136 44 17,528 
Corporate debt securities (2)
12,882 268 57 13,093 
U.S. Treasury securities 8,814 21 6 8,829 
U.S. state and municipal securities1,623 100 1 1,722 
Foreign government agency securities1,408 1 1 1,408 
Non-agency commercial mortgage-backed securities1,209 39 — 1,248 
Certificates of deposit1,000 — — 1,000 
Other22 4 — 26 
Total available for sale securities$356,439 $5,431 $2,248 $359,622 
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 June 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 32% and 36% of the asset-backed securities held as of June 30, 2021 and December 31, 2020, respectively.
(2) As of June 30, 2021 and December 31, 2020, approximately 39% 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
June 30, 2021Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Available for sale securities      
U.S. agency mortgage-backed securities$148,997 $2,122 $5,304 $17 $154,301 $2,139 
Corporate debt securities2,227 57 — — 2,227 57 
Asset-backed securities1,916 16 3,861 28 5,777 44 
U.S. Treasury securities3,872 6 — — 3,872 6 
U.S. state and municipal securities65 1 — — 65 1 
Foreign government agency securities705 1 — — 705 1 
Total$157,782 $2,203 $9,165 $45 $166,947 $2,248 
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
June 30, 2021Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Available for sale securities      
U.S. agency mortgage-backed securities$148,997 $2,122 $5,304 $17 $154,301 $2,139 
Corporate debt securities2,227 57 — — 2,227 57 
Asset-backed securities1,916 16 3,861 28 5,777 44 
U.S. Treasury securities3,872 6 — — 3,872 6 
U.S. state and municipal securities65 1 — — 65 1 
Foreign government agency securities705 1 — — 705 1 
Total$157,782 $2,203 $9,165 $45 $166,947 $2,248 
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:
June 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$2,790 $20,758 $65,817 $225,403 $314,768 
Asset-backed securities31 5,794 2,112 9,591 17,528 
Corporate debt securities2,986 6,240 3,867 — 13,093 
U.S. Treasury securities6,489 594 1,746 — 8,829 
U.S. state and municipal securities23 105 957 637 1,722 
Foreign government agency securities553 855 — — 1,408 
Non-agency commercial mortgage-backed securities — — — 1,248 1,248 
Certificates of deposit200 800 — — 1,000 
Other— — — 26 26 
Total fair value$13,072 $35,146 $74,499 $236,905 $359,622 
Total amortized cost$13,034 $34,010 $73,019 $236,376 $356,439 
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
June 30,		Six Months Ended June 30,
2021202020212020
Proceeds$3,037 $1 $9,642 $70 
Gross realized gains17 — 37 — 
Gross realized losses13 — 23 —