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Deposits - Schedule of Composition of Deposits (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Interest-bearing brokered money market deposits $ 313,000,000 $ 439,894,000
Customer deposits 122,814,000 116,694,000
Certificates of deposit with maturities within 1 year 580,513,000 354,807,000
Short-term deposits 1,016,327,000 911,395,000
Certificates of deposit with maturities greater than 1 year and less than 5 years 600,496,000 148,591,000
Total deposits $ 1,616,823,000 $ 1,059,986,000
Weighted average cost of funds on certificates of deposit outstanding (as a percent) 0.52% 1.81%
Weighted average cost of interest-bearing money market deposits (as a percent) 0.23% 0.27%
Certificates of deposits denominations in dollar amount $ 250,000 $ 250,000
Minimum    
Debt Instrument [Line Items]    
Certificate of deposits maturities period 9 months 1 year
Certificate of deposits, fixed interest rates range (as a percent) 0.12% 1.35%
Maximum    
Debt Instrument [Line Items]    
Certificate of deposits maturities period 5 years 5 years
Certificate of deposits, fixed interest rates range (as a percent) 3.52% 3.52%