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Debt Securities Available for Sale - Debt securities available- for-sale - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale      
Proceeds from sale of debt securities available-for-sale $ 235,992 $ 5,103 $ 99,445
Gross unrealized losses 298,348 1,888  
US Treasury Securities      
Debt Securities, Available-for-sale      
Proceeds from sale of debt securities available-for-sale 236,000 5,000  
Gross unrealized losses 102,059 0  
Obligations of U.S. Government sponsored entities      
Debt Securities, Available-for-sale      
Gross unrealized losses $ 0 $ 0