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Deposits and Related Interest (Narratives) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deposits [Abstract]      
Weighted Average Rate Domestic Deposit 0.86% 0.67%  
Time Deposits, $250,000 or More $ 692,100 $ 346,000  
Public Fund Time Deposits, $250,000 or more $ 257,200 $ 19,600  
Public Fund Time Deposits Weighted Average Rate, $250,000 or more 67.00% 116.40%  
Public funds deposit $ 278,700 $ 207,400  
Public Fund Collateral Investments 320,800 281,200  
Accrued Interest, Time Deposits 11,700    
Bank Overdrafts 1,000 1,100  
Brokered Certificates of Deposits 222,100 500,800  
Brokered Money Market Deposit 21,400 24,300  
Brokered securities sold 277,700    
Time Deposits [Line Items]      
Core Deposits 7,455,112 4,383,018  
Carrying value of securities sold 672,192 $ 17,837 $ 250,100
Scotiabank PR & USVI Acquisition [Member]      
Time Deposits [Line Items]      
Core Deposits 3,000,000    
Carrying value of securities sold $ 672,200