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CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Financial Measures of Capital (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 (core) capital (to adjusted total assets), amount | $ 263,555 | $ 216,931
Tier 1 (core) capital (to adjusted total assets), ratio | 8.35% | 19.85%
Tier 1 (core) capital (to adjusted total assets), minimum requirement for capital adequacy purposes, amount | $ 10,542 | $ 9,762
Tier 1 (core) capital (to adjusted total assets), minimum requirement for capital adequacy purposes, ratio | 4.00% | 4.50%
Tier 1 (core) capital (to adjusted total assets), minimum requirement to be well capitalized under prompt corrective action provisions, amount | $ 13,178 | $ 14,101
Tier 1 (core) capital (to adjusted total assets), minimum requirement to be well capitalized under prompt corrective action provisions, ratio | 5.00% | 6.50%
Common equity Tier 1 (to risk-weighted assets), actual amount | $ 255,543 |
Common equity Tier 1 (to risk-weighted assets), actual ratio | 17.28% |
Common equity Tier 1 (to risk-weighted assets), minimum requirement for capital adequacy purposes, amount | $ 11,499 |
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 | $ 16,610 |
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 |  | $ 224,426
Tangible capital (to tangible assets), actual ratio |  | 9.36%
Tangible capital (to tangible assets), minimum requirement for capital adequacy purposes, amount |  | $ 8,977
Tangible capital (to tangible assets), minimum requirement for capital adequacy purposes, ratio |  | 4.00%
Tangible capital (to tangible assets), minimum requirement to be well capitalized under prompt corrective actions provisions, actual amount |  | $ 11,221
Tangible capital (to tangible assets), minimum requirement to be well capitalized under prompt corrective actions provisions, ratio |  | 5.00%
Tier 1 (core) capital (to risk-weighted assets), actual amount | $ 263,555 | $ 224,426
Tier 1 (core) capital ( to risk weighted assets), ratio | 17.82% | 20.54%
Tier 1 (core) capital (to risk-weighted assets), minimum requirement for capital adequacy purposes, amount | $ 15,813 | $ 13,466
Tier 1 (core) capital (to risk-weighted assets), minimum requirement for capital adequacy purposes, ratio | 6.00% | 6.00%
Tier 1 (core) capital (to risk-weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, amount | $ 21,084 | $ 17,954
Tier 1 (core) capital (to risk-weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, ratio | 8.00% | 8.00%
Total qualifying capital (to risk-weighted assets), actual amount | $ 342,589 |
Total qualifying capital (to risk-weighted assets), ratio | 23.17% |
Total qualifying capital (to risk-weighted assets), minimum requirement for capital adequacy purposes, amount | $ 27,407 |
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 | $ 34,259 |
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 |  | $ 230,820
Total risk based capital (to risk weighted assets), ratio |  | 21.12%
Total risk based capital (to risk weighted assets), minimum requirement for capital adequacy purposes, amount |  | $ 18,466
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 |  | $ 23,082
Total risk based capital (to risk weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, ratio |  | 10.00%
MetaBank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 (core) capital (to adjusted total assets), amount | $ 324,142 | $ 213,220
Tier 1 (core) capital (to adjusted total assets), ratio | 10.35% | 19.52%
Common equity Tier 1 (to risk-weighted assets), actual amount | $ 324,142 |
Common equity Tier 1 (to risk-weighted assets), actual ratio | 21.95% |
Tangible capital (to tangible assets), actual amount |  | $ 213,220
Tangible capital (to tangible assets), actual ratio |  | 8.89%
Tier 1 (core) capital (to risk-weighted assets), actual amount | $ 324,142 | $ 213,220
Tier 1 (core) capital ( to risk weighted assets), ratio | 21.95% | 19.52%
Total qualifying capital (to risk-weighted assets), actual amount | $ 329,965 |
Total qualifying capital (to risk-weighted assets), ratio | 22.35% |
Total risk based capital (to risk weighted assets), actual amount |  | $ 219,614
Total risk based capital (to risk weighted assets), ratio |  | 20.11%

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