Annual report pursuant to Section 13 and 15(d)

Business Combinations - Additional Information (Details)

v3.22.0.1
Business Combinations - Additional Information (Details)
12 Months Ended
Feb. 28, 2020
USD ($)
Branch
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
Business Acquisition [Line Items]        
Goodwill   $ 77,681,000 $ 68,503,000 $ 77,681,000
Simmons Bank        
Business Acquisition [Line Items]        
Business acquisition date   Feb. 28, 2020    
Business acquisition, cash paid $ 131,571,000      
Goodwill 11,456,000      
Goodwill recognized expected to be deductible for income tax purposes $ 7,500,000      
Goodwill deductible for tax purpose amortization period 15 years      
Acquisition expenses   $ 441,000 $ 0  
Deemed purchased credit impaired $ 0      
Non-credit impaired loans fair value 255,500,000      
Contractual balance 260,300,000      
Interest income $ 4,800,000      
Simmons Bank | North/South Texas        
Business Acquisition [Line Items]        
Number of additional branches | Branch 5