XML 80 R47.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Jan. 01, 2018
USD ($)
Sep. 20, 2017
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Period for federal funds sold outstanding     1 day    
Average aggregate reserve     $ 22,500,000   $ 12,600,000
Loan non-accrual classification period     90 days    
Days to charged consumer loans to the value of the collateral     90 days    
Maximum time for re-evaluation (in months)     12 months    
Re-evaluation period for real estate     2 years    
Amount of fair value of capital over carrying value     $ 75,700,000    
Percentage of fair value of capital over carrying value     37.00%    
Number of times fair value of capital in excess of carrying value of goodwill description     over one and a half times    
Other real estate owned     $ 214,000   $ 600,000
Percentage of likelihood of realization of recognized tax benefit, minimum     50.00%    
Share stock split ratio   2      
Amount of reclassification effect     $ 0    
ASU 2018-02 [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Net effect on total stockholder's equity due to reclassification of tax effects $ 0        
Reclassification of tax effects from AOCI due to adoption of new Tax Cuts and Job Acts $ 359,000        
ASU 2016-02 [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Right of use assets       $ 491,700  
Lease liability       $ 491,700  
Maximum [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Maturity period of cash equivalents     3 months