XML 154 R101.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Mortgage Servicing Assets - Schedule of Range and Weighted-Average of Significant Unobservable Inputs (Details) - Discounted Cash Flow [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Commercial Mortgage Backed Securities [Member] | Minimum [Member] |  |
Servicing Assets at Fair Value [Line Items] |  |
Expected defaults | 1.00% | 1.00%
Discount rate | 7.00% | 7.00%
Escrow earn rate | 1.44% | 2.56%
Loan assumption rate | 0.01% | 0.00%
Commercial Mortgage Backed Securities [Member] | Maximum [Member] |  |
Servicing Assets at Fair Value [Line Items] |  |
Expected defaults | 2.00% | 2.00%
Discount rate | 11.44% | 15.00%
Escrow earn rate | 2.32% | 4.20%
Loan assumption rate | 3.37% | 3.22%
Commercial Mortgage Backed Securities [Member] | Weighted Average [Member] |  |
Servicing Assets at Fair Value [Line Items] |  |
Expected defaults | 1.13% | 1.14%
Discount rate | 9.32% | 9.18%
Escrow earn rate | 2.03% | 3.35%
Loan assumption rate | 1.37% | 1.35%
Residential Mortgage Backed Securities [Member] | Minimum [Member] |  |
Servicing Assets at Fair Value [Line Items] |  |
Discount rate | 7.50% | 7.50%
Prepayment speed | 10.38% | 8.45%
Servicing cost | $ 62,000 | $ 62,000
Residential Mortgage Backed Securities [Member] | Maximum [Member] |  |
Servicing Assets at Fair Value [Line Items] |  |
Discount rate | 8.50% | 10.00%
Prepayment speed | 61.51% | 56.11%
Servicing cost | $ 4,375,000 | $ 5,125,000
Residential Mortgage Backed Securities [Member] | Weighted Average [Member] |  |
Servicing Assets at Fair Value [Line Items] |  |
Discount rate | 7.52% | 7.54%
Prepayment speed | 12.95% | 9.08%
Servicing cost | $ 68,730 | $ 68,250

X
- Definition Interest rate used to account for mortgage loan at fair value upon assumption. + References No definition available. + Details
Name: | key_InterestRateUsedToAccountForMortgageLoanAtFairValueUponAssumption
Namespace Prefix: | key_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Servicing Assets And Servicing Liabilities At Fair Value, Assumptions Used To Estimate Fair Value, Escrow Earn Rate + References No definition available. + Details
Name: | key_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueEscrowEarnRate
Namespace Prefix: | key_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Servicing Assets And Servicing Liabilities At Fair Value, Assumptions Used To Estimate Fair Value, Servicing Cost + References No definition available. + Details
Name: | key_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueServicingCost
Namespace Prefix: | key_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Discount rate used to estimate the fair value of servicing assets and servicing liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
Name: | us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of contractually collectible principal associated with a financial asset expected not to be collected due to default by the borrower. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
Name: | us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueExpectedCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated rate of prepayments of principal on servicing assets and servicing liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
Name: | us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ServicingAssetsAtFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=key_DiscountedCashFlowMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |