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Securities - Additional Information (Detail) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Obligation
Securities
Dec. 31, 2013
Obligation
Securities
Amortized Cost and Fair Value Debt Securities [Abstract]    
Number of U.S. agency and mortgage-backed securities in an unrealized loss position 34 40
Number of obligations of state and political subdivisions in an unrealized loss position 16 21
Percentage of investment portfolio 100.00% 100.00%
Weighted-average period of re-pricing of portfolio 4 years 4 years 6 months
Impairment recognized $ 0