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Investments - Gross Unrealized Losses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Schedule of Trading Securities and Other Trading Assets        
Trading Securities, Realized Gain (Loss) $ 0us-gaap_TradingSecuritiesRealizedGainLoss $ 124us-gaap_TradingSecuritiesRealizedGainLoss $ 39us-gaap_TradingSecuritiesRealizedGainLoss $ 58us-gaap_TradingSecuritiesRealizedGainLoss
Unrealized gains (losses) from trading securities held for investment 265us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss 641us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss 242us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss (43)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
Preferred Stock [Member]        
Schedule of Trading Securities and Other Trading Assets        
Trading Securities, Realized Gain (Loss) $ 265us-gaap_TradingSecuritiesRealizedGainLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PreferredStockMember		 $ 765us-gaap_TradingSecuritiesRealizedGainLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PreferredStockMember		 $ 281us-gaap_TradingSecuritiesRealizedGainLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PreferredStockMember		 $ 15us-gaap_TradingSecuritiesRealizedGainLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PreferredStockMember