Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Amortized cost
Due in one year or less	$ 0
Due after one year through five years	10,447
Due after five years through ten years	28,126
Due after ten years	27,056
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Total	65,629
Mortgage-backed securities and CMO	41,023
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Total	106,652
Fair Value
Due in one year or less	0
Due after one year through five years	10,456
Due after five years through ten years	28,199
Due after ten years	26,893
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Total	65,548
Mortgage-backed securities and CMO	40,904
Available-for-sale Securities, Debt Securities, Total	106,452
Amortized cost
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years
Due after ten years	0
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Total	0
Mortgage-backed securities and CMO	8
Securities held to maturity, Amortized Cost	8	9
Fair Value
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years
Due after ten years	0
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Total	0
Mortgage-backed securities and CMO	8
Securities held to maturity, Fair Value	$ 8	$ 9