Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Receivables [Abstract]
Proceeds from sales of loans held for sale	$ 11,983,000	$ 37,326,000
Non-accrual loans	30,153,000		30,706,000
Restructured loans	12,100,000		12,100,000
Loans 90 days past due and accruing	5,101,000		3,218,000
Commitments to lend to borrowers with loan modifications classified as TDR's	$ 279,000