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Debt Securities Held-to-maturity - Allowance for credit loss on held to maturity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Debt securities held to maturity allowance for credit loss    
Beginning balance $ 8,096  
Ending balance 7,844  
Obligations of Puerto Rico, States and political subdivisions    
Debt securities held to maturity allowance for credit loss    
Beginning balance 8,096 $ 10,261
Provision for credit losses (benefit) (252) (165)
Securities charged-off 0 0
Recoveries 0 0
Ending balance $ 7,844 $ 10,096