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Securities - Additional Information (Detail) (USD $)
0 Months Ended
Apr. 01, 2014
Sep. 30, 2014
Apr. 01, 2014
Security
Amortized Cost and Fair Value Debt Securities [Abstract]      
Unrealized loss, other than temporary securities   $ 0  
Number of securities     319
Aggregate fair value of securities     167,100,000
Gain/Loss from net unrealized holdings, Net of tax 1,300,000    
Unrealized gain or loss, Held to maturity $ 0