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FDIC loss-share asset and true-up payment obligation - FDIC loss share - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
May 22, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition, Contingent Consideration          
OREO transfer to non-covered status       $ 0  
Payment to the FDIC as a consideration for the termination of the loss share agreement. $ 23,700        
Carrying amount (fair value)   $ 171,000      
FDIC loss-share asset net   44,500   0 $ 45,192
Gain from the FDIC termination agreement     $ 0 102,752 $ 0
FDIC          
Business Acquisition, Contingent Consideration          
Loss Sharing Agreement Allocation Percentage 80.00%        
Non-covered loans | Mortgages          
Business Acquisition, Contingent Consideration          
OREO transfer to non-covered status   15,300   $ 15,333  
Loans transfer to non-covered status   $ 514,600      
Banco Popular de Puerto Rico          
Business Acquisition, Contingent Consideration          
Loss Sharing Agreement Allocation Percentage 80.00%