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Debt Securities Held-to-maturity - Allowance for credit loss on held to maturity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Debt securities held to maturity allowance for credit loss    
Beginning balance $ 6,911  
Ending balance 5,780 $ 6,911
Obligations of Puerto Rico, States and political subdivisions    
Debt securities held to maturity allowance for credit loss    
Beginning balance 6,911 8,096
Provision for credit losses (benefit) (1,131) (1,185)
Securities charged-off 0 0
Recoveries 0 0
Ending balance $ 5,780 $ 6,911