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Loans Receivable - Troubled Debt Restructuring (Details) $ in Millions	12 Months Ended
	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

Financing Receivable, Modifications, Default, Number of Contracts Outstanding

+ References

No definition available.

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- Definition

Number Of Lending Commitments Outstanding

+ References

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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

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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

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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

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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

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