Loans Receivable (Narratives) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jul. 05, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable Line Items
Financing Receivable Modifications Recorded Investment Not Included In Non Accrual	$ 109,200		$ 98,100
Originated Loans Granted To Puerto Rico Government	94,900		136,600
Acquired Credit Facilities Granted to the Puerto Rico Public Corporation	50,300		66,200
Impaired Commercial Loans	72,300		54,300
Allowance for impaired commercial loans	10,600		1,800
Impaired Mortgage Loans	85,400		91,600
Allowance For Impaired Mortgage Loans	9,100		$ 7,800
Municipality loan, sale price		$ 28,800
Loans under forbearance program	83
Unpaid Principal Balance of loans under forbearance program	$ 2,600,000