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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Valuation_Techniques
Facilities
Business
Subsidiaries
Dec. 31, 2012
Dec. 31, 2011
Jul. 17, 2012
Schedule Of Accounting Policies [Line Items]        
Wholly owned subsidiaries 3      
Full service facilities maintained by bank 29      
Number of business conduct 0      
Number of valuation techniques to measure fair value 3      
Factor considered to be significant for fair value measurement 10.00%      
Accrual of interest discontinued description Principal or interest is past due 90 days or more, and the loan is not well secured or in the process of collection, or when serious doubt exists as to the collectability of a loan, the accrual of interest is discontinued      
Commercial loans as a percentage of total loan 47.00%      
Residential real estate loans as a percentage of total loan 17.00%      
Installment loans as a percentage of total loan 26.00%      
Mortgage warehouse loans as a percentage of total loan 9.00%      
Period in which loan sold by mortgage company 30 days      
Minimum period loan held by mortgage company 90 days      
Mortgage warehousing maximum pay off period 30 days      
Costs are deferred due to the term $ 0      
Impaired loans charged off 90 days      
Status of Non-Accrual of Loan 90 days      
Impairment of Loan 30 days      
Intangibles, Gross 3,300,000      
Goodwill 19,748,000 19,748,000   13,838,000
Uncertain tax positions recognized 50.00%      
Shares, non-dilutive 0 8,438 47,117  
Amount available for payment of dividend 22,200,000      
Cash and cash equivalents maximum maturity period 1 day      
Compensation expense 48,000 33,000 35,000  
Reclassifications effect on net income $ 0      
Buildings and Improvements [Member] | Minimum [Member]
        
Schedule Of Accounting Policies [Line Items]        
Useful Life for depreciation 3 years      
Buildings and Improvements [Member] | Maximum [Member]
        
Schedule Of Accounting Policies [Line Items]        
Useful Life for depreciation 40 years      
Furniture and Equipment [Member] | Minimum [Member]
        
Schedule Of Accounting Policies [Line Items]        
Useful Life for depreciation 2 years      
Furniture and Equipment [Member] | Maximum [Member]
        
Schedule Of Accounting Policies [Line Items]        
Useful Life for depreciation 20 years