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Business Combinations (Summary of Merger and Restructuring Charges) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Total merger and restructuring charges $ 0 $ 16,083 $ 24,054
Scotiabank PR & USVI Acquisition      
Business Acquisition [Line Items]      
Severance and employee-related charges   220 13,323
Professional services and system integrations   9,973 9,718
Branch consolidation   3,707 0
Other   2,183 1,013
Total merger and restructuring charges $ 0 $ 16,083 $ 24,054