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Loans Receivable (BBVAPR Acquired Loan 310-30 carrying amounts) (Details) - Acquired under ASC 310-30 Non-Covered Loans [Member] - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounts Notes And Loans Receivable Line Items            
Financing Receivable Acquired With Deteriorated Credit Quality $ 1,340,064   $ 1,481,616      
Non-acretable discount 347,173 $ 350,257 352,431 $ 364,548 $ 366,762 $ 363,107
Cash expected to be collected 992,891   1,129,185      
Accretable yield 278,394   308,913      
Carrying amount, gross 714,497   820,272      
Allowance for loan and lease losses 43,875   45,755      
Carrying amount, net $ 670,622   $ 774,517