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Debt Securities Held-to-maturity - Allowance for credit loss on 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
Debt securities held to maturity allowance for credit loss        
Beginning balance     $ 5,780  
Ending balance $ 6,251   6,251  
Obligations of Puerto Rico, States and political subdivisions        
Debt securities held to maturity allowance for credit loss        
Beginning balance 5,731 $ 6,792 5,780 $ 6,911
Provision for credit losses (benefit) 520 (647) 471 (766)
Securities charged-off 0 0 0 0
Recoveries 0 0 0 0
Ending balance $ 6,251 $ 6,145 $ 6,251 $ 6,145