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Net Income Per Common Share: Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share, Basic [Abstract]
Net income to common shareholders									$ 16,721	$ 14,167	$ 10,154
Denominator – weighted average common shares outstanding (shares)									7,334,577	7,136,690	6,842,614
Basic net income per common share (in dollars per share)	$ 0.60	$ 0.60	$ 0.58	$ 0.49	$ 0.50	$ 0.59	$ 0.44	$ 0.46	$ 2.28	$ 1.99	$ 1.48
Diluted net income per common share computation
Effect of dilutive stock options (shares)									191,767	163,773	78,910
Effect of dilutive stock warrant (shares)									0	79,590	183,825
Weighted average common shares outstanding-assuming dilution (shares)									7,526,344	7,380,053	7,105,349
Diluted net income per common share (in dollars per share)	$ 0.59	$ 0.59	$ 0.57	$ 0.48	$ 0.48	$ 0.58	$ 0.42	$ 0.43	$ 2.22	$ 1.92	$ 1.43

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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