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CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |
Tier 1 (core) capital (to adjusted total assets), amount |  | $ 224,426 |  | $ 176,388 |  |
Tier 1 (core) capital (to adjusted total assets), ratio |  | 9.36% |  | 8.60% |  |
Tier 1 (core) capital (to adjusted total assets), minimum requirement for capital adequacy purposes, amount |  | $ 8,977 |  | $ 82,057 |  |
Tier 1 (core) capital (to adjusted total assets), minimum requirement for capital adequacy purposes, ratio |  | 4.00% |  | 4.00% |  |
Tier 1 (core) capital (to adjusted total assets), minimum requirement to be well capitalized under prompt corrective action provisions, amount |  | $ 11,221 |  | $ 102,571 |  |
Tier 1 (core) capital (to adjusted total assets), minimum requirement to be well capitalized under prompt corrective action provisions, ratio |  | 5.00% |  | 5.00% |  |
Common equity Tier 1 (to risk-weighted assets), actual amount | [1] | $ 216,931 |  |  |  |
Common equity Tier 1 (to risk-weighted assets), actual ratio |  | 19.85% |  |  |  |
Common equity Tier 1 (to risk-weighted assets), minimum requirement for capital adequacy purposes, amount |  | $ 9,762 |  |  |  |
Common equity Tier 1 (to risk-weighted assets), minimum requirement for capital adequacy purposes, ratio |  | 4.50% |  |  |  |
Common equity Tier 1 (to risk-weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, amount |  | $ 14,101 |  |  |  |
Common equity Tier 1 (to risk-weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, ratio |  | 6.50% |  |  |  |
Tangible capital (to tangible assets), actual amount |  |  |  | $ 176,388 |  |
Tangible capital (to tangible assets), actual ratio |  |  |  | 8.60% |  |
Tangible capital (to tangible assets), minimum requirement for capital adequacy purposes, amount |  |  |  | $ 30,771 |  |
Tangible capital (to tangible assets), minimum requirement for capital adequacy purposes, ratio |  |  |  | 1.50% |  |
Tier 1 (core) capital (to risk-weighted assets), actual amount |  | $ 224,426 | [1] | $ 176,388 |  |
Tier 1 (core) capital ( to risk weighted assets), ratio |  | 20.54% |  | 20.95% |  |
Tier 1 (core) capital (to risk-weighted assets), minimum requirement for capital adequacy purposes, amount |  | $ 13,466 |  | $ 33,672 |  |
Tier 1 (core) capital (to risk-weighted assets), minimum requirement for capital adequacy purposes, ratio |  | 6.00% |  | 4.00% |  |
Tier 1 (core) capital (to risk-weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, amount |  | $ 17,954 |  | $ 50,508 |  |
Tier 1 (core) capital (to risk-weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, ratio |  | 8.00% |  | 6.00% |  |
Total qualifying capital (to risk-weighted assets), actual amount | [1] | $ 230,820 |  |  |  |
Total qualifying capital (to risk-weighted assets), ratio |  | 21.12% |  |  |  |
Total qualifying capital (to risk-weighted assets), minimum requirement for capital adequacy purposes, amount |  | $ 18,466 |  |  |  |
Total qualifying capital (to risk-weighted assets), minimum requirement for capital adequacy purposes, ratio |  | 8.00% |  |  |  |
Total qualifying capital (to risk-weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, amount |  | $ 23,082 |  |  |  |
Total qualifying capital (to risk-weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, ratio |  | 10.00% |  |  |  |
Total risk based capital (to risk weighted assets), actual amount |  |  |  | $ 181,786 |  |
Total risk based capital (to risk weighted assets), ratio |  |  |  | 21.59% |  |
Total risk based capital (to risk weighted assets), minimum requirement for capital adequacy purposes, amount |  |  |  | $ 67,344 |  |
Total risk based capital (to risk weighted assets), minimum requirement for capital adequacy purposes, ratio |  |  |  | 8.00% |  |
Total risk based capital (to risk weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, amount |  |  |  | $ 84,180 |  |
Total risk based capital (to risk weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, ratio |  |  |  | 10.00% |  |
Reconciliation of capital amounts [Abstract] |  |  |  |  |  |
Total equity |  | $ 271,335 | [1] | $ 174,802 | $ 142,984 | $ 145,859
Adjustments: |  |  |  |  |  |
Goodwill, net of associated deferred tax liabilities | [1] | 36,642 |  |  |  |
LESS: Certain other intangible assets | [1] | 13,431 |  |  |  |
LESS: Net deferred tax assets from operating loss and tax credit carry-forwards | [1] | 1,876 |  |  |  |
LESS: Net unrealized gains (losses) on available-for-sale securities | [1] | 2,455 |  |  |  |
Common Equity Tier 1 (1) | [1] | 216,931 |  |  |  |
Long-term debt and other instruments qualifying as Tier 1 |  | 10,310 | [1] | 10,310 |  |
LESS: Additional tier 1 capital deductions | [1] | 2,815 |  |  |  |
Total Tier 1 capital |  | 224,426 | [1] | 176,388 |  |
Allowance for loan losses | [1] | 6,394 |  |  |  |
Total qualifying capital | [1] | 230,820 |  |  |  |
MetaBank [Member] |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |
Tier 1 (core) capital (to adjusted total assets), amount |  | $ 213,219 |  | $ 176,388 |  |
Tier 1 (core) capital (to adjusted total assets), ratio |  | 8.89% |  | 8.60% |  |
Common equity Tier 1 (to risk-weighted assets), actual amount |  | $ 213,219 |  |  |  |
Common equity Tier 1 (to risk-weighted assets), actual ratio |  | 19.52% |  |  |  |
Tangible capital (to tangible assets), actual amount |  |  |  | $ 176,388 |  |
Tangible capital (to tangible assets), actual ratio |  |  |  | 8.60% |  |
Tier 1 (core) capital (to risk-weighted assets), actual amount |  | $ 213,219 |  | $ 176,388 |  |
Tier 1 (core) capital ( to risk weighted assets), ratio |  | 19.52% |  | 20.95% |  |
Total qualifying capital (to risk-weighted assets), actual amount |  | $ 219,613 |  |  |  |
Total qualifying capital (to risk-weighted assets), ratio |  | 20.11% |  |  |  |
Total risk based capital (to risk weighted assets), actual amount |  |  |  | $ 181,786 |  |
Total risk based capital (to risk weighted assets), ratio |  |  |  | 21.59% |  |
Adjustments: |  |  |  |  |  |
Common Equity Tier 1 (1) |  | $ 213,219 |  |  |  |
Total Tier 1 capital |  | 213,219 |  | $ 176,388 |  |
Total qualifying capital |  | $ 219,613 |  |  |  |
[1] | Basel III revised the definition of capital, increased minimum capital ratios, and introduced a minimum CET1 ratio. Those changes became effective for the Company on January 1, 2015, and are being fully phased in through the end of 2021. The capital ratios were determined using the Basel III capital rules that became effective on January 1, 2015.

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- Definition The minimum amount of Tangible Capital divided by tangible assets (Tangible Capital Ratio) as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition Tier 1 Risk Based Capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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