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Fair Value Measurements: Level 3 Fair Value Measurements, Nonrecurring (Details) - Nonrecurring - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, estimated fair value, nonrecurring | $ 5,987 | $ 9,636
Total impaired loans |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, estimated fair value, nonrecurring | 2,686 | 5,519
OREO and other repossessed assets |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, estimated fair value, nonrecurring | 3,301 | 4,117
Market approach | Total impaired loans |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, estimated fair value, nonrecurring | 2,686 | 5,519
Market approach | OREO and other repossessed assets |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, estimated fair value, nonrecurring | $ 3,301 | $ 4,117

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