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Earnings Per Share - Additional information (Details)	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share
Options Outstanding With An Exercise Price In Excess of the Market Price	50,500	13,500	50,500	13,500

X

- Definition

Represents the pure numeric value of Options Outstanding With An Exercise Price In Excess of the Market Price, during the indicated time period.

+ References

No definition available.

+ Details

Name:	smbc_OptionsOutstandingWithAnExercisePriceInExcessOfTheMarketPrice
Namespace Prefix:	smbc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_EarningsPerShareAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration