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Pledge Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Pledged Financial Instruments Not Separately Reported Securities Pledged | $ 2,324,006 | $ 2,884,307
Assets Not Pledged | 3,285,225 | 3,374,632
Investment Securities |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Assets Not Pledged | 648,125 | 483,373
Residential Mortgage Member |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Assets Not Pledged | 348,030 | 379,065
Commercial Loan [Member] |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Assets Not Pledged | 1,064,923 | 1,287,036
Consumer Loan [Member] |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Assets Not Pledged | 329,050 | 295,492
Auto and Leases Loan [Member] |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Assets Not Pledged | 895,097 | 929,666
Investment [Member] | Investment Securities |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Pledged Financial Instruments Not Separately Reported Securities Pledged | 703,243 | 1,111,425
Mortgage Loan [Member] |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Pledged Financial Instruments Not Separately Reported Securities Pledged | 1,028,234 | 1,095,810
Commercial Loan [Member] |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Pledged Financial Instruments Not Separately Reported Securities Pledged | 592,529 | 677,072
Securities sold under agreements to repurchase secured with cash or equivalents [Member] |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Pledged Financial Instruments Not Separately Reported Securities Pledged | 700,498 | 1,021,370
Puerto Rico public fund deposits [Member] | Commercial Loan [Member] |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Pledged Financial Instruments Not Separately Reported Securities Pledged | 209,236 | 410,932
Puerto Rico Cash & Money Market Fund [Member] |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Pledged Financial Instruments Not Separately Reported Securities Pledged | 0 | 81,576
Interest Rate Swap [Member] | Investment [Member] |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Pledged Financial Instruments Not Separately Reported Securities Pledged | 2,397 | 8,100
Federal Reserve Bank Credit Facilities | Commercial Loan [Member] |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Pledged Financial Instruments Not Separately Reported Securities Pledged | 1,303 | 12,877
Bond For Trust Operation [Member] | Investment [Member] |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Pledged Financial Instruments Not Separately Reported Securities Pledged | 348 | 379
Federal Home Loan Bank Advances [Member] | Mortgage Loan [Member] |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Pledged Financial Instruments Not Separately Reported Securities Pledged | 1,028,234 | 1,095,810
Federal Home Loan Bank Advances [Member] | Commercial Loan [Member] |  |
FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems |  |
Pledged Financial Instruments Not Separately Reported Securities Pledged | $ 381,990 | $ 253,263

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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=55761124&loc=SL6224234-111729 + Details
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