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Benefit Plans - Additional Information (Details)
 1 Months Ended 12 Months Ended
Jan. 01, 2024
USD ($)
May 23, 2022
Dec. 31, 2017
USD ($)
Sep. 30, 2015
USD ($)
Feb. 28, 2014
USD ($)
agreement
Dec. 31, 2023
USD ($)
employee
security
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Benefit Plans [Line Items]                
Eligibility to participate in ESOP based on service (in months)           6 months    
Eligibility age to participate in ESOP           21 years    
Contributions for the plan necessary to amortize the debt to the company, period (in years)           20 years    
Compensation cost related to ESOP           $ 908,000 $ 1,096,000 $ 1,052,000
Fair value of the unearned ESOP shares           $ 7,125,000 8,219,000  
Chief Operations Officer | Subsequent Event                
Benefit Plans [Line Items]                
Vested benefit paid $ 100,254              
401 (k) and Profit Sharing Plan                
Benefit Plans [Line Items]                
Percent of employee's pretax annual earnings allowed to be contributed into the plan (as percent)           75.00%    
Employer matching contribution as percentage of employee contributions made on first 2% of employee's pay (as percent)           100.00%    
Percent of employee's pay to be matched by employer (as percent)           2.00%    
Additional employer matching contribution on employee contributions between 2% and 6% (as percent)           50.00%    
Contributions made by company, amount           $ 1,610,000 1,255,000 $ 974,000
401 (k) and Profit Sharing Plan | Maximum                
Benefit Plans [Line Items]                
Percent of employee's pay to be matched by employer (as percent)           6.00%    
Salary Continuation Agreements                
Benefit Plans [Line Items]                
Post retirement liability outstanding           $ 3,128,000 $ 3,220,000  
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 (in years)           10 years    
Vested period (in years)           10 years    
Percent of period vested (as percent)           100.00%    
2007 Salary Continuation Agreements | Chief Credit Officer                
Benefit Plans [Line Items]                
Period of stated annual benefit (in years)   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 (in months)           24 months    
2007 Salary Continuation Agreements | Former executive | American Bank                
Benefit Plans [Line Items]                
Contribution to salary agreement     $ 358,000          
Payment period (in years)     14 years          
2019 Salary Continuation Agreements | Chief Executive Officer                
Benefit Plans [Line Items]                
Period of stated annual benefit (in years)           10 years    
Percent of period vested (as 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 (in years)   10 years            
Vested period (in years)   10 years            
Age after which employees will be entitled to a stated annual benefit   65 years            
2014 Salary Continuation Agreements | Former executive | Britton & Koontz                
Benefit Plans [Line Items]                
Number of salary continuation agreements | agreement         2      
Contribution to salary agreement         $ 465,000      
Payment period (in years)         15 years      
2015 Salary Continuation Agreements | Louisiana Bancorp, Inc.                
Benefit Plans [Line Items]                
Contribution to salary agreement       $ 1,200,000        
Number of salary continuation agreements | security           2    
Stated annual benefit for executive       10 years