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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Feb. 06, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Line Items]          
FDIC indemnification asset termination, cash paid   $ 10,100,000      
FDIC indemnification asset, termination benefit   $ 1,400,000      
Held-to-maturity, Amortized cost       $ 424,740,000  
Fair Value Assets Level 1 To Level 2 Transfers Amount $ 0   $ 0 0 $ 0
Fair Value Assets Level 2 To Level 1 Transfers Amount 0   0 0 0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net     0 0 $ 0
Goodwill Impairment Loss     0 $ 0  
Scotiabank Of Puerto Rico [Member]          
Accounting Policies [Line Items]          
Aggregate purchase price 550,000,000   550,000,000    
US Virgin Island [Member]          
Accounting Policies [Line Items]          
Premium on deposits $ 10,000,000   $ 10,000,000