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Business Combinations, Goodwill and Intangible Assets (Narrative) (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 01, 2019
USD ($)
banking_office
$ / shares
shares
Jun. 25, 2019
USD ($)
Oct. 15, 2018
USD ($)
banking_office
shares
Oct. 14, 2018
USD ($)
$ / shares
May 18, 2018
USD ($)
banking_office
Jan. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 28, 2019
$ / shares
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]                        
Assets             $ 3,929,090,000 $ 4,977,577,000 $ 4,397,672,000 $ 3,929,090,000    
Equity             458,640,000 624,709,000 573,820,000 458,640,000   $ 364,571,000
Goodwill             103,681,000 121,956,000 121,306,000 103,681,000   $ 54,058,000
Non-recurring merger costs excluded from pro-forma information                 66,207,000 53,461,000    
Goodwill impairment               0 0 0    
Amortization of expense intangible assets               3,539,000 3,721,000 1,752,000    
Core Banking                        
Business Acquisition [Line Items]                        
Goodwill             102,349,000 120,624,000 119,974,000 102,349,000    
Insurance                        
Business Acquisition [Line Items]                        
Goodwill             1,332,000 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                    
Pro forma net income                 6,624,000      
Pro forma revenues                 18,436,000      
Equity Instruments 50,118,000                      
Cash for options and fractional shares 216,000                      
Loans 356,970,000                      
Additional goodwill recorded               $ 650,000        
Citizens First | Acquisition-related Costs                        
Business Acquisition [Line Items]                        
Non-recurring merger costs excluded from pro-forma information                 $ 3,205,000      
Citizens First | Core Deposit Intangible                        
Business Acquisition [Line Items]                        
Intangible Assets $ 4,500,000                      
Weighted average useful live of intangibles 8 years                      
Citizens First | Financial Asset Acquired and No Credit Deterioration                        
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  
First Security                        
Business Acquisition [Line Items]                        
Number of banking offices | banking_office     11                  
Direct acquisition costs     $ 4,000,000.0                  
Goodwill     43,194,000                  
Intangible Assets     6,139,000                  
Goodwill non-deductible for tax purposes     $ 43,200,000                  
Cash portion, cash per share for common stock converted (USD per share) | $ / shares       $ 12.00                
Number of the Company's common stock for each share converted (in shares) | shares     0.7982                  
Shares of common stock issued for acquisition (in shares) | shares     1,988,000                  
Equity Instruments     $ 64,898,000 $ 29,886,000                
Cash for options and fractional shares     132,000 $ 124,000                
Loans     390,106,000                  
First Security | Core Deposit Intangible                        
Business Acquisition [Line Items]                        
Intangible Assets     $ 6,100,000                  
Weighted average useful live of intangibles     8 years                  
First Security | Financial Asset Acquired and No Credit Deterioration                        
Business Acquisition [Line Items]                        
Fair value of non-impaired loans and customers receivables acquired     $ 382,400,000                  
Unpaid principal of non-impaired loans and customers receivables acquired     $ 385,400,000                  
First Security | KSOP Shares                        
Business Acquisition [Line Items]                        
Cash portion, cash per share for common stock converted (USD per share) | $ / shares       $ 40.00                
Equity Instruments       $ 1,153,000                
Branch Acquisition                        
Business Acquisition [Line Items]                        
Direct acquisition costs         $ 691,000              
Goodwill         6,965,000              
Intangible Assets         3,475,000              
Deposits         175,700,000              
Loans         116,305,000              
Premium paid on deposits         $ 7,400,000 $ 100,000            
Period to adjust premium paid on deposits         6 months              
Loans put back after acquisition date             $ 1,300,000          
Goodwill deductible for tax purposes         $ 7,000,000.0              
Branch Acquisition | Core Deposit Intangible                        
Business Acquisition [Line Items]                        
Intangible Assets         $ 3,500,000              
Weighted average useful live of intangibles         8 years              
Branch Acquisition | INDIANA                        
Business Acquisition [Line Items]                        
Number of banking offices | banking_office         5              
Branch Acquisition | Columbus, Indiana                        
Business Acquisition [Line Items]                        
Number of banking offices | banking_office         4              
Branch Acquisition | Greensburg, Indiana                        
Business Acquisition [Line Items]                        
Number of banking offices | banking_office         1              
Citizens First                        
Business Acquisition [Line Items]                        
Number of banking offices | banking_office 8                      
Assets $ 456,000,000.0                      
Equity $ 49,800,000                      
First Security                        
Business Acquisition [Line Items]                        
Assets       563,000,000.0                
Equity       $ 58,300,000