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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Segment
Office
Mar. 31, 2013
Dec. 31, 2013
Accounting Policies [Line Items]      
Number of offices in which the company operates throughout the country 22    
Impairment charge related to investment       
Held to maturity or trading securities        
Debt securities other than temporarily impaired        
Maturity of interest bearing deposits 90 days    
Contractual term of loans , reasonable period 6 months    
Balance of loans serviced for others 321,035   322,653
Foreclosed real estate totaled 2,612   987
Advertising expense 233 74  
Percentage of deferred tax assets 50.00%    
Accumulated other comprehensive income (loss), net of taxes $ (2,037)   $ (4,813)
Number of operating significant segment 1    
Maximum [Member]
     
Accounting Policies [Line Items]      
Cash and cash equivalents, original maturities 90 days    
Maximum [Member] | Building and Improvements [Member]
     
Accounting Policies [Line Items]      
Plant and equipment, useful life 40 years    
Maximum [Member] | Furniture and Equipment [Member]
     
Accounting Policies [Line Items]      
Plant and equipment, useful life 15 years    
Minimum [Member] | Building and Improvements [Member]
     
Accounting Policies [Line Items]      
Plant and equipment, useful life 10 years    
Minimum [Member] | Furniture and Equipment [Member]
     
Accounting Policies [Line Items]      
Plant and equipment, useful life 3 years