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MBS And Other Investments: Narrative-Realized Gains (Losses) (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2015 security	Mar. 31, 2014 security	Mar. 31, 2015 security	Mar. 31, 2014 security	Sep. 30, 2014
Investments [Abstract]
Marketable Securities, Realized Gain			$ 0tsbk_MarketableSecuritiesRealizedGain	$ 0tsbk_MarketableSecuritiesRealizedGain
Marketable Securities, Gain (Loss)	0us-gaap_MarketableSecuritiesGainLoss	32,000us-gaap_MarketableSecuritiesGainLoss	45,000us-gaap_MarketableSecuritiesGainLoss
Loss on sale of securities	21,000tsbk_MarketableSecuritiesRealizedLoss	365,000tsbk_MarketableSecuritiesRealizedLoss	38,000tsbk_MarketableSecuritiesRealizedLoss	405,000tsbk_MarketableSecuritiesRealizedLoss
Held-to-maturity securities, realized loss, number of securities	12	12	14	15
Available-for-sale securities, realized loss, number of securities	5			6
Security owned and pledged as collateral	$ 4,500,000		$ 4,500,000		$ 6,220,000

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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