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Long Term Borrowings - Additional Information (Details) - USD ($)
Jul. 26, 2016
Aug. 05, 2014
Sep. 30, 2020
Feb. 26, 2020
Dec. 31, 2019
Net proceeds from issuance of subordinated long-term debt $ 147,400,000 $ 68,800,000      
Subordinated Debt          
Debt instrument, interest rate, stated percentage 5.00% 5.75%      
Debt instrument, face amount $ 150,000,000.0 $ 70,000,000.0      
Payments of debt issuance costs $ 2,600,000 $ 1,200,000      
FHLB Advance, 1.81%          
Long-term borrowings     $ 50,000,000 $ 50,000,000 $ 0
Debt instrument, interest rate, stated percentage       1.81%