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Investment Securities - Mortgage-Backed Securities (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Fair market value of received mortgage-backed securities $ 37,900,000  
Net gain recognized on the securitization 344,000 $ 0
Fixed-rate mortgage loans    
Schedule of Investments [Line Items]    
Book value 36,800,000  
Net gain recognized on the securitization $ 1,500,000