Fair Value Measurement - Assets and Liabilities Measured on Non-recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Permanent Real Estate Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans	$ 1,171	$ 2,219
Construction Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans	1,564	1,587
Consumer Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans		339
Permanent Real Estate Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Other real estate owned, net	1,435	1,939
Construction Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Other real estate owned, net	1,988	2,310
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Permanent Real Estate Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Construction Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Permanent Real Estate Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Other real estate owned, net
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Construction Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Other real estate owned, net
Significant Other Observable Inputs (Level 2) [Member] | Permanent Real Estate Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans
Significant Other Observable Inputs (Level 2) [Member] | Construction Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans
Significant Other Observable Inputs (Level 2) [Member] | Permanent Real Estate Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Other real estate owned, net
Significant Other Observable Inputs (Level 2) [Member] | Construction Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Other real estate owned, net
Significant Unobservable Inputs (Level 3) [Member] | Permanent Real Estate Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans	1,171	2,219
Significant Unobservable Inputs (Level 3) [Member] | Construction Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans	1,564	1,587
Significant Unobservable Inputs (Level 3) [Member] | Consumer Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans		339
Significant Unobservable Inputs (Level 3) [Member] | Permanent Real Estate Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Other real estate owned, net	1,435	1,939
Significant Unobservable Inputs (Level 3) [Member] | Construction Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Other real estate owned, net	$ 1,988	$ 2,310