Loans and Allowance for Loan Losses - Non-Accrual Loans, Loans Still Accruing and Past Due 90 Days or More and Restructured Loans (Parenthetical) (Detail) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Receivables [Abstract]
Carrying amount of purchased credit impaired loans	$ 2,519,000	$ 3,497,000	$ 2,707,000
Restructured loans	$ 10,810,000	$ 16,373,000	$ 13,298,000