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Acquisitions and Preliminary Purchase Price Allocation Acquisitions and Preliminary Purchase Price Allocation (Details) - USD ($)
$ / shares in Units, shares in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 07, 2018
Business Acquisition [Line Items]        
Goodwill $ 108,941,000 $ 109,567,000 $ 76,196,000  
Merger related costs 797,000 13,257,000 0  
Legal and professional fees $ 2,371,000 1,847,000 $ 1,956,000  
Write-downs included in other non-interest expense   $ 500,000    
Farmers Deposit Bancorp, Inc. [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired       100.00%
Business Acquisition, Name of Acquired Entity   Farmers Deposit Bancorp, Inc.    
Business Acquisition, Share Price       $ 1,174.14
Payments to Acquire Businesses, Gross   $ 24,900,000    
Premium on Time Deposits       $ 100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       3,334,000
Goodwill       $ 4,694,000
Poage Bankshares, Inc. [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired       100.00%
Business Acquisition, Name of Acquired Entity   Poage Bankshares, Inc.    
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares   1.1    
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned       $ 82,565,000
Business Acquisition, Share Price       $ 24.22
Payments to Acquire Businesses, Gross   $ 16,000    
Premium on Time Deposits       $ 1,700,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       8,054,000
Goodwill       28,050,000
Poage and Farmers [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned       82,565,000
Payments to Acquire Businesses, Gross   24,916,000    
Premium on Time Deposits Amortization Period 5 years      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       11,388,000
Business Acquisition Purchase Price Allocation Amortizable Intangible Assets Time Period 10 years      
Goodwill       $ 32,744,000
Merger related costs $ 800,000 13,300,000    
Severance Costs   3,200,000    
Legal and professional fees   3,700,000    
Information Technology and Data Processing   $ 5,200,000