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Securities (Net Gains and Losses on Trading Account Securities) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]      
Net gain on sales transactions $ 829us-gaap_TradingSecuritiesRealizedGain $ 878us-gaap_TradingSecuritiesRealizedGain $ 1,219us-gaap_TradingSecuritiesRealizedGain
Net mark-to-market gains (losses) 0us-gaap_AvailableForSaleSecuritiesTransfersToTradingGainsLossesNet (429)us-gaap_AvailableForSaleSecuritiesTransfersToTradingGainsLossesNet (161)us-gaap_AvailableForSaleSecuritiesTransfersToTradingGainsLossesNet
Net gain on trading account securities $ 829us-gaap_TradingSecuritiesRealizedGainLoss $ 449us-gaap_TradingSecuritiesRealizedGainLoss $ 1,058us-gaap_TradingSecuritiesRealizedGainLoss