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Debt Securities Available for Sale - Realized gains and losses on debt securities available-for-sale (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures        
Gross Realized Gains $ 695 $ 41 $ 695 $ 41
Gross Realized Losses (672) 0 (672) 0
Net realized gains on sale of debt securities available-for-sale $ 23 $ 41 $ 23 $ 41