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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 07, 2018
Business Acquisition [Line Items]        
Goodwill $ 109,567,000 $ 76,196,000 $ 76,196,000  
Merger related costs 13,257,000 0 0  
Legal and professional fees 1,847,000 $ 1,956,000 $ 1,882,000  
Write-downs included in other non-interest expense $ 492,000      
Farmers Deposit Bancorp, Inc. [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired       100.00%
Goodwill       $ 4,738,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       3,334,000
Premium on Time Deposits       $ 100,000
Business Acquisition, Name of Acquired Entity Farmers Deposit Bancorp, Inc.      
Payments to Acquire Businesses, Gross $ 24,900,000.00      
Business Acquisition, Share Price       $ 1,174.14
Poage Bankshares, Inc. [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired       100.00%
Goodwill       $ 28,633,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       8,054,000
Premium on Time Deposits       1,700,000
Business Acquisition, Name of Acquired Entity Poage Bankshares, Inc.      
Payments to Acquire Businesses, Gross $ 16,000      
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 1.1      
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned       $ 82,600,000
Business Acquisition, Share Price       $ 24.22
Poage and Farmers [Member]        
Business Acquisition [Line Items]        
Goodwill       $ 33,371,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       11,388,000
Merger related costs $ 13,257,000      
Severance Costs $ 3,200,000      
Business Acquisition Purchase Price Allocation Amortizable Intangible Assets Time Period 10 years      
Premium on Time Deposits Amortization Period 5 years      
Legal and professional fees $ 3,700,000      
Information Technology and Data Processing 5,200,000      
Payments to Acquire Businesses, Gross $ 24,916,000      
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned       $ 82,600,000