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Fair Value (Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Carrying amounts and estimated fair values of financial instruments: |  |  |
Securities available for sale | $ 178,190 us-gaap_AvailableForSaleSecurities | $ 164,034 us-gaap_AvailableForSaleSecurities | $ 180,190 us-gaap_AvailableForSaleSecurities
Securities held to maturity | 174,756 us-gaap_HeldToMaturitySecuritiesFairValue | 182,411 us-gaap_HeldToMaturitySecuritiesFairValue | 57,192 us-gaap_HeldToMaturitySecuritiesFairValue
Total loans, net of allowance | 2,359,403 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered | 2,355,548 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered | 2,399,150 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered
Accrued interest receivable | 8,744 us-gaap_InterestReceivable | 8,920 us-gaap_InterestReceivable | 8,990 us-gaap_InterestReceivable
FDIC Indemnification Asset. | 18,452 us-gaap_FDICIndemnificationAsset | 22,569 us-gaap_FDICIndemnificationAsset | 35,504 us-gaap_FDICIndemnificationAsset
Bank-owned life insurance | 55,793 us-gaap_BankOwnedLifeInsurance | 55,421 us-gaap_BankOwnedLifeInsurance | 44,367 us-gaap_BankOwnedLifeInsurance
Accrued interest payable | 619 us-gaap_InterestPayableCurrentAndNoncurrent | 686 us-gaap_InterestPayableCurrentAndNoncurrent | 758 us-gaap_InterestPayableCurrentAndNoncurrent
Carrying Amount [Member] |  |  |
Carrying amounts and estimated fair values of financial instruments: |  |  |
Cash and due from banks, noninterest-bearing | 84,208 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 81,068 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Due from banks, interest-bearing | 159,527 us-gaap_DueFromBanks / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 171,248 us-gaap_DueFromBanks / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Federal funds sold | 752 fbp_FedFundsSoldFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 768 fbp_FedFundsSoldFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Securities available for sale | 178,190 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 164,034 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Securities held to maturity | 170,804 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 178,687 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Presold mortgages in process of settlement | 8,273 fbp_PresoldMortgagesInProcessOfSettlementFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 6,019 fbp_PresoldMortgagesInProcessOfSettlementFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Total loans, net of allowance | 2,359,403 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 2,355,548 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Accrued interest receivable | 8,744 us-gaap_InterestReceivable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 8,920 us-gaap_InterestReceivable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
FDIC Indemnification Asset. | 18,452 us-gaap_FDICIndemnificationAsset / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 22,569 us-gaap_FDICIndemnificationAsset / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Bank-owned life insurance | 55,793 us-gaap_BankOwnedLifeInsurance / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 55,421 us-gaap_BankOwnedLifeInsurance / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Deposits | 2,693,614 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 2,695,906 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Borrowings | 116,394 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 116,394 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Accrued interest payable | 619 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 686 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Fair Value [Member] |  |  |
Carrying amounts and estimated fair values of financial instruments: |  |  |
Cash and due from banks, noninterest-bearing | 84,208 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 81,068 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Due from banks, interest-bearing | 159,527 us-gaap_DueFromBanks / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 171,248 us-gaap_DueFromBanks / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Federal funds sold | 752 fbp_FedFundsSoldFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 768 fbp_FedFundsSoldFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Securities available for sale | 178,190 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 164,034 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Securities held to maturity | 174,756 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 182,411 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Presold mortgages in process of settlement | 8,273 fbp_PresoldMortgagesInProcessOfSettlementFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 6,019 fbp_PresoldMortgagesInProcessOfSettlementFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Total loans, net of allowance | 2,335,626 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 2,328,244 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Accrued interest receivable | 8,744 us-gaap_InterestReceivable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 8,920 us-gaap_InterestReceivable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
FDIC Indemnification Asset. | 17,964 us-gaap_FDICIndemnificationAsset / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 21,856 us-gaap_FDICIndemnificationAsset / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Bank-owned life insurance | 55,793 us-gaap_BankOwnedLifeInsurance / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 55,421 us-gaap_BankOwnedLifeInsurance / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Deposits | 2,693,961 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 2,696,153 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Borrowings | 106,844 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 105,407 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Accrued interest payable | 619 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 686 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Level in Fair Value Hierachy [Member] |  |  |
Carrying amounts and estimated fair values of financial instruments: |  |  |
Cash and due from banks, noninterest-bearing | 1 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember | 1 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember |
Due from banks, interest-bearing | 1 us-gaap_DueFromBanks / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember | 1 us-gaap_DueFromBanks / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember |
Federal funds sold | 1 fbp_FedFundsSoldFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember | 1 fbp_FedFundsSoldFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember |
Securities available for sale | 2 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember | 2 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember |
Securities held to maturity | 2 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember | 2 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember |
Presold mortgages in process of settlement | 1 fbp_PresoldMortgagesInProcessOfSettlementFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember | 1 fbp_PresoldMortgagesInProcessOfSettlementFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember |
Total loans, net of allowance | 3 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember | 3 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember |
Accrued interest receivable | 1 us-gaap_InterestReceivable / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember | 1 us-gaap_InterestReceivable / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember |
FDIC Indemnification Asset. | 3 us-gaap_FDICIndemnificationAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember | 3 us-gaap_FDICIndemnificationAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember |
Bank-owned life insurance | 1 us-gaap_BankOwnedLifeInsurance / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember | 1 us-gaap_BankOwnedLifeInsurance / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember |
Deposits | 2 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember | 2 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember |
Borrowings | 2 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember | 2 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember |
Accrued interest payable | $ 2 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember | $ 2 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsLevelMember |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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- Definition The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611 + Details
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- Definition Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits. + References No definition available. + Details
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- Definition A bank's noninterest bearing demand deposits in other banks (such as correspondents). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition Amount of interest payable on debt, including, but not limited to, trade payables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums over and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans and leases covered under loss sharing agreements. + References No definition available. + Details
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