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Business Combinations - Additional Information (Details) - USD ($)
3 Months Ended
Feb. 14, 2022
Feb. 22, 2021
Mar. 31, 2022
Jul. 28, 2021
Mar. 31, 2021
Sep. 25, 2020
Business Acquisition [Line Items]            
Common stock, par value (in dollars per share)     $ 4   $ 4  
Delta Bancshare Company            
Business Acquisition [Line Items]            
Percentage of issued and outstanding shares acquired       100.00%    
Common stock, par value (in dollars per share)       $ 10.00    
Share Price       $ 4.00    
Consideration paid in cash $ 15,150,000          
Consideration paid in shares 2,292,270          
Goodwill acquired during period $ 28,600,000          
Pre-tax of acquisition costs 785,000   $ 535,000      
Loans 418,509,000          
Accreted to interest income over the remaining term of loans 8,200,000          
Elimination of deferred fees and unearned discounts previously recorded by Jefferson Bank 300,000          
Allowance for credit losses for loans identified as PCD 863,000   863,000      
Purchased credit deteriorated loans     18,796,000      
Change in acquired time deposits 560,378,000          
Change in FHLB advances 45,075,000          
Delta Bancshare Company | Core Deposit Intangibles            
Business Acquisition [Line Items]            
Intangible asset fair value $ 5,920,000          
Intangible asset estimated useful life 10 years          
Delta Bancshare Company | Fair Value Adjustments            
Business Acquisition [Line Items]            
Loans $ (7,924,000)          
Change in acquired time deposits 1,759,000          
Change in FHLB advances 75,000          
Delta Bancshare Company | Fair Value Adjustments | Core Deposit Intangibles            
Business Acquisition [Line Items]            
Intangible asset fair value 5,920,000          
Delta Bancshare Company | Acquired Book Value            
Business Acquisition [Line Items]            
Loans 426,433,000          
Purchased credit deteriorated loans 18,800,000          
Change in acquired time deposits 558,619,000          
Change in FHLB advances 45,000,000          
Delta Bancshare Company | Acquired Book Value | Core Deposit Intangibles            
Business Acquisition [Line Items]            
Intangible asset fair value $ 0          
LINCO Bancshares, Inc.            
Business Acquisition [Line Items]            
Percentage of issued and outstanding shares acquired           100.00%
Common stock, par value (in dollars per share)           $ 1.00
Share Price           $ 4.00
Consideration paid in cash   $ 103,500,000        
Consideration paid in shares   1,262,246        
Dividends paid   $ 13,000,000        
Goodwill acquired during period   5,400,000        
Pre-tax of acquisition costs   9,000,000     $ 8,500,000  
Loans   828,976,000        
Accreted to interest income over the remaining term of loans   11,100,000        
Elimination of deferred fees and unearned discounts previously recorded by Jefferson Bank   1,700,000        
Allowance for credit losses for loans identified as PCD   2,000,000 2,074,000      
Purchased credit deteriorated loans     $ 64,647,000      
Change in acquired time deposits   990,410,000        
Change in FHLB advances   27,916,000        
LINCO Bancshares, Inc. | Core Deposit Intangibles            
Business Acquisition [Line Items]            
Intangible asset fair value   $ 2,148,000        
Intangible asset estimated useful life   10 years        
LINCO Bancshares, Inc. | Fair Value Adjustments            
Business Acquisition [Line Items]            
Loans   $ (9,401,000)        
Change in acquired time deposits   2,081,000        
Change in FHLB advances   975,000        
LINCO Bancshares, Inc. | Fair Value Adjustments | Core Deposit Intangibles            
Business Acquisition [Line Items]            
Intangible asset fair value   2,025,000        
LINCO Bancshares, Inc. | Acquired Book Value            
Business Acquisition [Line Items]            
Loans   838,377,000        
Purchased credit deteriorated loans   64,600,000        
Change in acquired time deposits   988,329,000        
Change in FHLB advances   26,941,000        
LINCO Bancshares, Inc. | Acquired Book Value | Core Deposit Intangibles            
Business Acquisition [Line Items]            
Intangible asset fair value   $ 123,000