XML 30 R54.htm IDEA: XBRL DOCUMENT v2.4.0.8
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Segment
Dec. 31, 2012
Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]      
Number of reportable operating segment 1    
Maturity period of Interest bearing deposits in other financial institutions 1 year    
Period of delinquent loan 90 days    
Loss history of portfolio segment determination period 2 years    
Advertising costs $ 939 $ 859 $ 822
Number of nonqualified options or restricted stock for key employees and independent director 500,000    
Description of award terms For key employees, the plan vesting schedule is one-fourth of granted stock-based awards per year beginning one year after the grant date with 100% vested on the fourth anniversary. For independent directors, the vesting schedule is one-third of granted stock-based awards per year beginning one year after the grant date with 100% vested on the third anniversary.    
Unrecognized compensation cost related to nonvested stock options granted under this plan 0 0  
Stock options, granted 0 0  
Shares granted by Executive Compensation and Personnel Committee of the Board of Directors 31,500 26,900 17,900
Compensation expense restricted stock awards 390 277 213
Average amount of non interest bearing reserve with federal reserve bank $ 50 $ 50  
Independent Directors [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Starting period of vesting of stock based award 1 year    
Aggregate percentage of stock based awards to be matured 100.00%    
Key Employees [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Starting period of vesting of stock based award 1 year    
Aggregate percentage of stock based awards to be matured 100.00%    
Minimum [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Percentage of tax benefit realized 50.00%    
Maximum [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Period of Consumer loans charged off 180 days    
Premises and Equipment [Member] | Minimum [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of premises and equipment 3 years    
Premises and Equipment [Member] | Maximum [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of premises and equipment 39 years    
Furniture, Fixtures and Equipment [Member] | Minimum [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of premises and equipment 3 years    
Furniture, Fixtures and Equipment [Member] | Maximum [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of premises and equipment 10 years    
Buildings and Building Improvements [Member] | Minimum [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of premises and equipment 15 years    
Buildings and Building Improvements [Member] | Maximum [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of premises and equipment 39 years    
Core Deposit [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Amortization of intangible assets 7 years