XML 78 R65.htm IDEA: XBRL DOCUMENT
v3.20.4

Mortgage Servicing Rights (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Expected amortization expense on mortgage servicing rights |  |  |
2021 | $ 1,390 |  |
2022 | 1,020 |  |
2023 | 720 |  |
2024 | 490 |  |
2025 | 340 |  |
Residential mortgage loans |  |  |
Mortgage Servicing Rights |  |  |
Unpaid principal balance | $ 838,450 | $ 740,910 | $ 734,300

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | source_ServicingAssetAtAmortizedValueExpectedAmortizationAbstract
Namespace Prefix: | source_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of expense to be charged against earnings in the next fiscal year following the latest balance sheet date, for the periodic recognition of servicing assets relative to estimated net servicing income. + References No definition available. + Details
Name: | source_ServicingAssetAtAmortizedValueExpectedAmortizationCurrent
Namespace Prefix: | source_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of expense to be charged against earnings in the year five following the latest balance sheet date, for the periodic recognition of servicing assets relative to estimated net servicing income. + References No definition available. + Details
Name: | source_ServicingAssetAtAmortizedValueExpectedAmortizationInYearFive
Namespace Prefix: | source_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of expense to be charged against earnings in the year four following the latest balance sheet date, for the periodic recognition of servicing assets relative to estimated net servicing income. + References No definition available. + Details
Name: | source_ServicingAssetAtAmortizedValueExpectedAmortizationInYearFour
Namespace Prefix: | source_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of expense to be charged against earnings in the year three following the latest balance sheet date, for the periodic recognition of servicing assets relative to estimated net servicing income. + References No definition available. + Details
Name: | source_ServicingAssetAtAmortizedValueExpectedAmortizationInYearThree
Namespace Prefix: | source_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of expense to be charged against earnings in the year two following the latest balance sheet date, for the periodic recognition of servicing assets relative to estimated net servicing income. + References No definition available. + Details
Name: | source_ServicingAssetAtAmortizedValueExpectedAmortizationInYearTwo
Namespace Prefix: | source_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
Name: | us-gaap_PrincipalAmountOutstandingOfLoansHeldInPortfolio
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_ServicingAssetsAtAmortizedValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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