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Securities - Allowance for credit losses for debt securities held-to-maturity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Activity in the allowance for credit losses for debt securities held-to-maturity        
Beginning balance $ 986 $ 915 $ 862 $ 907
Provision (benefit) 99 (71) 223 (63)
Allowance for credit losses 1,085 $ 844 1,085 $ 844
Other Debt Obligations [Member]        
Activity in the allowance for credit losses for debt securities held-to-maturity        
Beginning balance     862  
Allowance for credit losses $ 1,085   $ 1,085