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Securities - Sales Transactions of Securities Available-for-Sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]      
Proceeds from sales $ 42,333 $ 232,598 $ 70,652
Proceeds from sales     70,652
Gross realized gains 179 1,123  
Gross realized gains     327
Gross realized losses 0 (595)  
Gross realized losses     (767)
Net gains (losses) on sales of available-for-sale securities $ 179 $ 528  
Net gains (losses) on sales of available-for-sale securities     $ (440)