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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures      
Gross Realized Gains $ 0 $ 0 $ 695
Gross Realized Losses 0 0 (672)
Net realized gains (losses) on sale of debt securities available-for-sale $ 0 $ 0 $ 23