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Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Amortized cost  
Due in one year or less $ 506
Due after one year through five years 8,463
Due after five years through ten years 15,914
Due after ten years 45,995
Available for sale Securities, Debt Maturities, with Single Maturity Date, Amortized Cost, Total 70,878
Mortgage-backed securities and CMO 45,220
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Total 116,098
Fair Value  
Due in one year or less 507
Due after one year through five years 8,583
Due after five years through ten years 16,397
Due after ten years 47,383
Available for sale Securities, Debt Maturities, with Single Maturity Date, Fair Value, Total 72,870
Mortgage-backed securities and CMO 45,866
Available-for-sale Securities, Debt Securities, Total 118,736
Amortized cost  
Due in one year or less 0
Due after one year through five years 0
Due after five years through ten years 0
Due after ten years 0
Held-to-maturity Securities, Debt Maturities, with Single Maturity Date, Net Carrying Amount, Total 0
Mortgage-backed securities and CMO 12
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount, Total 12
Fair Value  
Due in one year or less 0
Due after one year through five years 0
Due after five years through ten years 0
Due after ten years 0
Held-to-maturity Securities, Debt Maturities, with Single Maturity Date, Fair Value, Total 0
Mortgage-backed securities and CMO 12
Held-to-maturity Securities, Debt Maturities, Fair Value, Total $ 12