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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Activity in the allowance for credit losses for debt securities held-to-maturity        
Beginning balance $ 1,084 $ 1,087 $ 1,087 $ 1,100
Provision (benefit) 5 (8) 2 (21)
Ending balance $ 1,089 $ 1,079 $ 1,089 $ 1,079