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Business Combinations - Additional Information (Details) - USD ($)
9 Months Ended
Feb. 14, 2022
Feb. 22, 2021
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
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 $ 28,200,000        
Pre-tax of acquisition costs     $ 2,400,000    
Pre-tax of acquisition costs     2,100,000    
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        
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      
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   2,074,000      
Purchased credit deteriorated loans   64,647,000      
Change in acquired time deposits   990,410,000      
Change in FHLB advances   27,916,000      
Dividends paid   13,000,000      
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