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Debt Securities Held-to-maturity - Allowance for credit loss on held to maturity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Debt securities held to maturity allowance for credit loss        
Beginning balance     $ 6,911  
Ending balance $ 6,057   6,057  
Obligations of Puerto Rico, States and political subdivisions        
Debt securities held to maturity allowance for credit loss        
Beginning balance 6,145 $ 7,495 6,911 $ 8,096
Provision for credit losses (benefit) (88) (285) (854) (886)
Securities charged-off 0 0 0 0
Recoveries 0 0 0 0
Ending balance $ 6,057 $ 7,210 $ 6,057 $ 7,210