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Pledged Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Financial Instruments Not Separately Reported Securities Pledged $ 1,925,904 $ 1,658,398
Assets Not Pledged 3,928,780 3,710,606
Investment Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets Not Pledged 637,509 921,610
Residential Mortgage Member    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets Not Pledged 354,868 325,698
Commercial Loan [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets Not Pledged 1,414,054 1,152,151
Consumer Loan [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets Not Pledged 373,814 361,497
Auto and Leases Loan [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets Not Pledged 1,148,535 949,650
Investment [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Financial Instruments Not Separately Reported Securities Pledged 629,088 230,251
Commercial Loan [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Financial Instruments Not Separately Reported Securities Pledged 416,225 456,375
Securities Sold under Agreements to Repurchase, Long-Term [Member] | Investment [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Financial Instruments Not Separately Reported Securities Pledged 487,181 205,484
Derivative [Member] | Investment [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Financial Instruments Not Separately Reported Securities Pledged 423 1,478
Puerto Rico public fund deposits [Member] | Investment [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Financial Instruments Not Separately Reported Securities Pledged 141,162 22,948
Puerto Rico public fund deposits [Member] | Commercial Loan [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Financial Instruments Not Separately Reported Securities Pledged 140,123 150,036
Federal Reserve Bank Credit Facilities | Commercial Loan [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Financial Instruments Not Separately Reported Securities Pledged 651 993
Bond For Trust Operation [Member] | Investment [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Financial Instruments Not Separately Reported Securities Pledged 322 341
Federal Home Loan Bank Advances [Member] | Mortgage Loan [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Financial Instruments Not Separately Reported Securities Pledged 880,591 971,772
Federal Home Loan Bank Advances [Member] | Commercial Loan [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Financial Instruments Not Separately Reported Securities Pledged $ 275,451 $ 305,346