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Business Combinations and Intangible Assets (Pro Forma Results) (Details) - Scotiabank [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Net interest income $ 478,293 $ 488,791
Net income $ 147,848 $ 161,555
Earnings per share: Basic $ 3.01 $ 3.55
Earnings per share: Diluted $ 2.99 $ 3.25