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Business Combinations - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
May 15, 2014
American Security Bank [Member]
Sep. 30, 2014
American Security Bank [Member]
Branch
Sep. 30, 2014
American Security Bank [Member]
May 15, 2014
American Security Bank [Member]
Branch
Sep. 30, 2014
American Security Bank [Member]
Electronic Branch [Member]
Branch
May 15, 2014
American Security Bank [Member]
Electronic Branch [Member]
Branch
May 15, 2014
American Security Bank [Member]
Loan Production Office [Member]
Branch
Business Acquisition [Line Items]                    
Business acquisition date   Oct. 16, 2009       May 15, 2014        
Acquired assets and assumed liabilities for cash       $ 57,000,000            
Number of bank branches             5   2 1
Number of branch locations consolidated         2          
Number of banking vestibules closed               2    
Estimated fair values refinement period       1 year            
Goodwill 74,244,000 74,244,000 55,097,000       19,100,000      
Total fair value of assets acquired             436,400,000      
Cash and cash due from banks             117,800,000      
Investment securities available for sale             44,500,000      
FHLB stock             1,900,000      
Loans receivable             242,700,000      
Fixed assets             4,800,000      
Core deposit intangible assets             2,100,000      
Other real estate owned             1,600,000      
Other assets             1,800,000      
Total fair value of liabilities assumed             379,400,000      
Deposits             378,400,000      
Other liabilities             1,000,000      
Non-recurring merger related expenses $ 640,000 $ 1,932,000     $ 640,000 $ 1,900,000