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Securities - Equity Securities Realized Losses (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Net gain on equity investments $ 21,214,000  
Less: Net gains recognized on equity securities sold 5,401,000 $ 0
Unrealized gain recognized on equity securities still held $ 15,813,000