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Deposits - Schedule of Deposits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Interest-bearing money market deposits $ 439,894 $ 362,246
Customer deposits 116,694 112,571
Certificates of deposit with maturities within 1 year 354,807 835,996
Short-term deposits 911,395 1,310,813
Certificates of deposit with maturities greater than 1 year and less than 5 years 148,591 143,399
Total deposits $ 1,059,986 $ 1,454,212
Weighted average cost of funds on certificates of deposit outstanding (as a percent) 1.81% 2.57%
Weighted average cost of interest-bearing money market deposits (as a percent) 0.27% 1.88%
Certificates of deposit, denominations ($250 or less) $ 250  
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Certificates of deposit, maturities range 1 year 4 months
Certificates of deposit, fixed interest rates range 1.35% 1.80%
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Certificates of deposit, maturities range 5 years 5 years
Certificates of deposit, fixed interest rates range 3.52% 3.52%