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Investment Securities - Investment Securities (Parenthetical) (Detail)
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Amortized Cost And Fair Value Debt Securities [Abstract]    
Federal statutory rate 35.00%  
Weighted-average maturity of available-for-sale investment securities 4 years 10 months 24 days 6 years
Weighted-average yield of available-for-sale investment securities 2.43% 2.64%
Weighted average maturity of held-to-maturity investment securities 4 years 3 months 18 days 4 years 6 months
Weighted-average yield of held-to-maturity investment securities 1.98% 2.00%