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Fair Value - Financial Instruments Measured At Fair Value On Non-Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Single-family residential [Member]
  
Impaired loans:  
Impaired loans at Fair Value 57
Single-family residential [Member] | Comparable sales approach [Member]
  
Impaired loans:  
Valuation Technique(s) Comparable sales approach
Multi-family residential [Member]
  
Impaired loans:  
Commercial real estate at Fair Value 2,070
Impaired loans:  
Fair Value Inputs, Adjustment for differences between the comparable market transactions (32.70%)
Multi-family residential [Member] | Comparable sales approach [Member]
  
Impaired loans:  
Valuation Technique(s) Comparable sales approach
Commercial [Member]
  
Impaired loans:  
Impaired loans at Fair Value 121
Commercial [Member] | Income approach [Member]
  
Impaired loans:  
Valuation Technique(s) Income approach
Commercial [Member] | Non-owner occupied [Member]
  
Impaired loans:  
Commercial real estate at Fair Value 1,806
Impaired loans:  
Fair Value Inputs, Adjustment for differences between the comparable market transactions (7.30%)
Commercial [Member] | Non-owner occupied [Member] | Comparable sales approach [Member]
  
Impaired loans:  
Valuation Technique(s) Comparable sales approach
Commercial [Member] | Owner occupied [Member]
  
Impaired loans:  
Commercial real estate at Fair Value 1,244
Impaired loans:  
Fair Value Inputs, Adjustment for differences between the comparable market transactions (0.80%)
Commercial [Member] | Owner occupied [Member] | Comparable sales approach [Member]
  
Impaired loans:  
Valuation Technique(s) Comparable sales approach
Minimum [Member] | Single-family residential [Member]
  
Impaired loans:  
Fair Value Inputs, Adjustment for differences between the comparable market transactions 2.30%
Minimum [Member] | Multi-family residential [Member]
  
Impaired loans:  
Fair Value Inputs, Adjustment for differences between the comparable market transactions (39.00%)
Minimum [Member] | Commercial [Member]
  
Impaired loans:  
Fair Value Inputs, Adjustment for differences in net operating income expectations (10.00%)
Minimum [Member] | Commercial [Member] | Non-owner occupied [Member]
  
Impaired loans:  
Fair Value Inputs, Adjustment for differences between the comparable market transactions (12.20%)
Minimum [Member] | Commercial [Member] | Owner occupied [Member]
  
Impaired loans:  
Fair Value Inputs, Adjustment for differences between the comparable market transactions (6.30%)
Maximum [Member] | Multi-family residential [Member]
  
Impaired loans:  
Fair Value Inputs, Adjustment for differences between the comparable market transactions (27.10%)
Maximum [Member] | Commercial [Member] | Non-owner occupied [Member]
  
Impaired loans:  
Fair Value Inputs, Adjustment for differences between the comparable market transactions 16.70%
Maximum [Member] | Commercial [Member] | Owner occupied [Member]
  
Impaired loans:  
Fair Value Inputs, Adjustment for differences between the comparable market transactions 0.50%