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Goodwill (Details)	6 Months Ended
	Mar. 31, 2017
Goodwill [Line Items]
Discount rate	10.60%
Residual capitalization rate	7.60%
CAPM forecast period (years)	5 years
Long-term growth rate	3.00%
Expected control premium rate	25.00%
Minimum
Goodwill [Line Items]
Annual loan growth rate	3.00%
Annual deposit growth rate	2.50%
Return on assets	0.90%
Maximum
Goodwill [Line Items]
Annual loan growth rate	3.90%
Annual deposit growth rate	3.50%
Return on assets	1.10%

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- Definition

Goodwill Impairment, Capital Asset Pricing Model, Forecast Period

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- Definition

Goodwill Impairment, Capitalization Rate

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- Definition

Goodwill Impairment, Deposit Growth Rate

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- Definition

Goodwill Impairment, Loan Growth Rate

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- Definition

Goodwill Impairment, Long-Term Growth Rate

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- Definition

Goodwill Impairment Test, Discount Rate

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- Definition

Goodwill Impairment Test, Expected Control Premium

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- Definition

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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