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Benefit Plans - Additional Information (Detail)
$ in Thousands
 1 Months Ended 12 Months Ended
May 20, 2019
Dec. 31, 2017
USD ($)
Sep. 30, 2015
USD ($)
Feb. 28, 2014
USD ($)
Dec. 31, 2019
USD ($)
security
employee
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Benefit Plans [Line Items]              
Eligibility to participate in ESOP based on service         6 months    
Eligibility age to participate in ESOP         21 years    
Contributions for the plan necessary to amortize the debt to the company, period         20 years    
Compensation cost related to ESOP         $ 1,085 $ 1,345 $ 1,262
Fair value of the unearned ESOP shares         $ 12,245 12,324  
401 (k) and Profit Sharing Plan              
Benefit Plans [Line Items]              
Percent of employee's pretax annual earnings allowed to be contributed into the plan (percent)         75.00%    
Employer matching contribution as percentage of employee contributions made on first 2% of employee's pay (percent)         100.00%    
Percent of employee's pay to be matched by employer (percent)         2.00%    
Additional employer matching contribution on employee contributions between 2% and 6% (percent)         50.00%    
Contributions made by company, amount         $ 919 872 $ 701
401 (k) and Profit Sharing Plan | Maximum              
Benefit Plans [Line Items]              
Percent of employee's pay to be matched by employer (percent)         6.00%    
Salary Continuation Agreements              
Benefit Plans [Line Items]              
Post retirement liability outstanding         $ 3,227 $ 3,124  
2007 Salary Continuation Agreements              
Benefit Plans [Line Items]              
Number of employees covered | employee         4    
2007 Salary Continuation Agreements | Chief Executive Officer              
Benefit Plans [Line Items]              
Period of stated annual benefit         10 years    
Vested period         10 years    
Percent of period vested (percent)         100.00%    
2007 Salary Continuation Agreements | Chief Credit Officer              
Benefit Plans [Line Items]              
Period of stated annual benefit         10 years    
Period for which executive's beneficiary will receive upon death         120 months    
Age after which employees will be entitled to a stated annual benefit         65 years    
Period of separation from service         24 months    
Delay in periods         6 months    
2007 Salary Continuation Agreements | Former executive | American Bank              
Benefit Plans [Line Items]              
Contribution to salary agreement   $ 358          
Payment period   14 years          
2019 Salary Continuation Agreements | Chief Executive Officer              
Benefit Plans [Line Items]              
Period of stated annual benefit 10 years            
Percent of period vested (percent) 100.00%            
Age after which employees will be entitled to a stated annual benefit 65 years            
2019 Salary Continuation Agreements | Chief Financial Officer              
Benefit Plans [Line Items]              
Period of stated annual benefit 10 years            
Vested period 10 years            
Age after which employees will be entitled to a stated annual benefit 65 years            
Period of separation from service 24 months            
2014 Salary Continuation Agreements | Former executive | Britton & Koontz              
Benefit Plans [Line Items]              
Contribution to salary agreement       $ 465      
Payment period       15 years      
2015 Salary Continuation Agreements | Louisiana Bancorp, Inc.              
Benefit Plans [Line Items]              
Contribution to salary agreement     $ 1,200        
Number of salary continuation agreements | security         2    
Stated annual benefit for executive     10 years