Number of trust preferred securities issued.

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- Definition

Long-Term Leases, Noncurrent

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- Definition

Refers to the number of authorized shares of trust preferred securities issued by the entity.

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No definition available.

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- Definition

This element represents number of consecutive semi-annual periods that interest payment may be deferred.

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No definition available.

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- Definition

Number of Capital Leases

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No definition available.

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- Definition

Number of Equipment Leases

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No definition available.

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- Definition

Number of Property Leases

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- Definition

Proceeds from Issuance of Debt, Before Expenses and Underwriting Discounts and Commissions

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No definition available.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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No definition available.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Carrying value as of the balance sheet date of collateralized/uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Subordinated debt places a lender in a lien position behind the primary lender of the company.

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Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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SHORT TERM AND LONG TERM DEBT SHORT TERM AND LONG TERM DEBT - Long Term Debt Narrative (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2017 USD ($) Lease Period $ / shares shares	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Debt Instrument [Line Items]
Advances from FHLB	$ 0	$ 7,000
Weighted average rate of FHLB advances	1.27%
Proceeds from long term debt	$ 0	75,000	$ 0
Proceeds from debt, net of issuance costs	73,347	73,211
Accrued interest payable	$ 2,280	$ 875
Number of capital leases \| Lease	3
Number of equipment leases \| Lease	2
Number of property leases \| Lease	1
Leases expense in next twelve months	$ 1,900
First Midwest Financial Capital Trust I [Member]
Debt Instrument [Line Items]
Equity method investment, ownership percentage	100.00%
Issuance of trust preferred securities (in shares) \| shares	10,000
Number of authorized shares of trust preferred securities issued (in shares) \| shares	10,310
Number of consecutive semi-annual periods that interest payments on capital securities may be deferred \| Period	10
Redemption price per capital security (in dollars per share) \| $ / shares	$ 1,000
First Midwest Financial Capital Trust I [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	3.75%
Effective interest rate	5.22%	4.99%
5.75% Fixed to Floating Rate Subordinated Debt, Due August 15, 2026 [Member] \| Subordinated Debt [Member]
Debt Instrument [Line Items]
Proceeds from long term debt	$ 75,000
Interest rate, stated percentage	5.75%
Net proceeds from issuance of debt, before issuance costs	$ 73,900
Proceeds from debt, net of issuance costs	73,300
Debt issuance costs	1,700
Accrued interest payable	$ 4,300
Weighted Average [Member]
Debt Instrument [Line Items]
Weighted average rate of FHLB advances		6.98%
Weighted Average [Member] \| First Midwest Financial Capital Trust I [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Effective interest rate	12.50%