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Loans Receivable - Troubled Debt Restructuring (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) commitment loan | Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |  |
Carrying value of loan | $ |  |  | $ 37.6
Carrying value of loans before allowance for loan losses | $ | $ 37.8 | $ 66.4 |
Number of TDR contracts outstanding | commitment | 1 |  |
Number of lending commitments outstanding | loan | 0 |  |
Performing Financial Instruments |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans | loan | 0 | 0 | 0

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- Definition Number Of Lending Commitments Outstanding + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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