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Goodwill and Intangible Assets Reconciliation of Purchase Price to Goodwill (Details) - First BancTrust [Member] - USD ($)
$ in Thousands
 9 Months Ended
May 01, 2018
Dec. 11, 2017
Sep. 30, 2018
Reconciliation of purchase price to goodwill recorded [Line Items]      
Goodwill Provisionally Recorded $ 27,400    
Purchase price (in excess of net book value) 26,946    
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities 59,586    
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets 535    
Fair value of premises and equipment 9,437    
Fair value of time deposits 385,624    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances 30,672    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures 4,735    
Business Combination, Net Fair Value Adjustments (455)    
Resulting goodwill from acquisition 26,491 $ 26,500 $ 26,500
Fair Value Adjustment [Member]      
Reconciliation of purchase price to goodwill recorded [Line Items]      
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities 320    
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans, net 3,463    
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets 12    
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Mortgage Servicing Rights (1,097)    
Fair value of premises and equipment 689    
Fair value of time deposits 1,301    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances (328)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures (1,451)    
Core deposit intangible 5,224    
Other assets $ 1,860