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Borrowings - Summary of Debt Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total $ 438,838 $ 304,675
Federal Home Loan Bank Advances    
Debt Instrument [Line Items]    
September 30, 2021 100,000  
September 30, 2022 0  
September 30, 2023 0  
September 30, 2024 0  
September 30, 2025 0  
Due thereafter 100,000  
Total $ 200,000