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Business Combinations, Goodwill and Intangible Assets (Narrative) (Details)
 12 Months Ended
Jul. 01, 2019
USD ($)
banking_office
$ / shares
shares
Jun. 25, 2019
USD ($)
Dec. 31, 2021
USD ($)
banking_office
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 28, 2019
$ / shares
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]              
Number of banking offices | banking_office     63        
Assets     $ 5,608,539,000 $ 4,977,577,000 $ 4,397,672,000    
Equity     668,459,000 624,709,000 573,820,000   $ 458,640,000
Goodwill     121,761,000 121,956,000 121,306,000   $ 103,681,000
Decrease in goodwill attributable to sale of branches     195,000 0 0    
Goodwill impairment     0        
Amortization of expense intangible assets     $ 2,731,000 3,539,000 3,721,000    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Brank Branches              
Business Acquisition [Line Items]              
Number of branches sold | banking_office     2        
Core Banking              
Business Acquisition [Line Items]              
Goodwill     $ 120,429,000 120,624,000 119,974,000    
Insurance              
Business Acquisition [Line Items]              
Goodwill     $ 1,332,000 1,332,000 $ 1,332,000    
Citizens First              
Business Acquisition [Line Items]              
Direct acquisition costs $ 3,300,000            
Goodwill 17,739,000            
Intangible Assets 4,547,000            
Goodwill non-deductible for tax purposes $ 17,700,000            
Cash portion, cash per share for common stock converted (USD per share) | $ / shares $ 5.80            
Number of the Company's common stock for each share converted (in shares) | shares 0.6629            
Shares of common stock issued for acquisition (in shares) | shares 1,664,000            
Total cash consideration paid, including options and fractional shares $ 15,500,000 $ 15,500,000          
Additional goodwill recorded       $ 650,000      
Citizens First | Non-impaired loans              
Business Acquisition [Line Items]              
Fair value of non-impaired loans and customers receivables acquired 349,900,000            
Unpaid principal of non-impaired loans and customers receivables acquired 353,300,000            
Citizens First | CFB 401(k) Shares              
Business Acquisition [Line Items]              
Cash portion, cash per share for common stock converted (USD per share) | $ / shares           $ 25.77  
Additional cash paid for each shares acquired (in dollar per share) | $ / shares           $ 5.80  
Citizens First | Core Deposit Intangible              
Business Acquisition [Line Items]              
Intangible Assets $ 4,500,000            
Weighted average useful live of intangibles 8 years            
Citizens First              
Business Acquisition [Line Items]              
Number of banking offices | banking_office 8            
Assets $ 456,000,000            
Equity $ 49,800,000