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FAIR VALUE MEASUREMENTS - Quantitative Information (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Foreclosed Assets, net | $ 30,050 | $ 292
Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range of estimated selling cost | 4.00% |
Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range of estimated selling cost | 10.00% |
Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | $ 0 | 0
Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 0 | 0
Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 1,530,891 | 1,318,402
Impaired Loans [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 110 | 0
1-4 Family Real Estate [Member] | Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 0 | 0
1-4 Family Real Estate [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 0 | 0
1-4 Family Real Estate [Member] | Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 205,553 | 196,970
Commercial Operating [Member] | Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 0 | 0
Commercial Operating [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 0 | 0
Commercial Operating [Member] | Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 46,987 | 35,723
Foreclosed Assets [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 30,050 | 292
Nonrecurring [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 30,160 | 292
Nonrecurring [Member] | Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 0 | 0
Nonrecurring [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 0 | 0
Nonrecurring [Member] | Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 30,160 | 292
Nonrecurring [Member] | Impaired Loans [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 110 |
Nonrecurring [Member] | Impaired Loans [Member] | Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 0 |
Nonrecurring [Member] | Impaired Loans [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 0 |
Nonrecurring [Member] | Impaired Loans [Member] | Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 110 |
Nonrecurring [Member] | 1-4 Family Real Estate [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 110 |
Nonrecurring [Member] | 1-4 Family Real Estate [Member] | Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 0 |
Nonrecurring [Member] | 1-4 Family Real Estate [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 0 |
Nonrecurring [Member] | 1-4 Family Real Estate [Member] | Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 110 |
Nonrecurring [Member] | Foreclosed Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Foreclosed Assets, net | 30,050 | 292
Nonrecurring [Member] | Foreclosed Assets [Member] | Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Foreclosed Assets, net | 0 |
Nonrecurring [Member] | Foreclosed Assets [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Foreclosed Assets, net | 0 |
Nonrecurring [Member] | Foreclosed Assets [Member] | Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Foreclosed Assets, net | $ 30,050 | $ 292

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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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