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Pledged Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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

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- Definition Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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