Loans - Summary of Nonaccrual Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Loans Receivable [Line Items]
Nonaccrual loans	$ 16,396	$ 21,083
Nonaccrual Loans [Member] | Construction [Member]
Loans Receivable [Line Items]
Nonaccrual loans	75	806
Nonaccrual Loans [Member] | Commercial real estate [Member]
Loans Receivable [Line Items]
Nonaccrual loans	10,133	5,831
Nonaccrual Loans [Member] | Consumer real estate [Member]
Loans Receivable [Line Items]
Nonaccrual loans	2,347	818
Nonaccrual Loans [Member] | Commercial and industrial [Member]
Loans Receivable [Line Items]
Nonaccrual loans	3,784	13,556
Nonaccrual Loans [Member] | Other consumer [Member]
Loans Receivable [Line Items]
Nonaccrual loans	$ 57	$ 72