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Debt Securities Available for Sale - Realized gains and losses on debt securities available-for-sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures      
Gross Realized Gains $ 695 $ 41 $ 0
Gross Realized Losses (672) 0 (20)
Net realized gains (losses) on sale of debt securities available-for-sale $ 23 $ 41 $ (20)