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Business Combinations (Summary of Restructuring Reserves) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Merger and restructuring charges $ 16,083 $ 24,054 $ 0
Scotiabank PR & USVI Acquisition [Member]      
Business Acquisition [Line Items]      
Balance at the beginning of the period 17,491 0  
Merger and restructuring charges 16,083 24,054  
Cash payments (18,445) (6,563)  
Balance at the end of the period $ 15,129 $ 17,491 $ 0