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Loans and Allowance for Losses and Concentrations of Credit Risk - Troubled Debt Restructurings (Details) | 6 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Receivables [Abstract] |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  |  | $ 10,900,000 | $ 200,000
Loan Restructuring, Trial Modifications, Amount |  |  | 800,000 |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 0 | $ 177,033 | $ 10,900,000 |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 0 | 0 | 0 |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 0 | $ 0 |  |
Financing Receivable, Modifications, Subsequent Default, Determination of Allowance for Credit Losses | 0 | 0 |  |

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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 Description of how troubled debt restructurings within the previous 12 months and for which there was a payment default during the period are factored into the determination of the allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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- Definition Amount of loan receivable in which the terms of the loan agreement have been modified on a trial basis. + References No definition available. + Details
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- References No definition available. + Details
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