Fair Value - Summary of Carrying Value and Fair Value of Company's Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financial Assets
Securities held to maturity		$ 14,542
Loans, net	1,284,139	1,203,977
Carrying Amount [Member]
Financial Assets
Securities held to maturity	0	13,818
Loans, net	1,266,816	1,179,467
Financial Liabilities
Deposits	1,806,045	1,758,961
Borrowings	50,000	50,000
Subordinated debt	53,610	53,610
Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Financial Assets
Securities held to maturity	0	0
Loans, net	0	0
Financial Liabilities
Deposits	0	0
Borrowings	0	0
Subordinated debt	0	0
Significant Other Observable Inputs Level 2 [Member]
Financial Assets
Securities held to maturity	0	14,542
Loans, net	0	0
Financial Liabilities
Deposits	0	0
Borrowings	53,856	55,604
Subordinated debt	42,888	37,527
Significant Other Unobservable Inputs Level 3 [Member]
Financial Assets
Securities held to maturity	0	0
Loans, net	1,272,893	1,201,178
Financial Liabilities
Deposits	1,807,183	1,761,119
Borrowings	0	0
Subordinated debt	$ 0	$ 0