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Business Combinations Assets Acquired and Liabilities Assumed (Details) - USD ($)
 6 Months Ended
May 01, 2018
Sep. 08, 2016
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     $ 501,285,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     429,660,000  
Aggregate Total Of Cash Paid In Business Combination     10,275,000 $ 0
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable     61,350,000  
Business Combination, Value of Total Consideration Paid     71,625,000 $ 0
First BancTrust [Member]        
Business Acquisition [Line Items]        
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand   $ 20,598,000    
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities   (59,586,000)    
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans   (362,858,000)    
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses   0    
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets   (535,000)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment   (9,437,000)    
Business Acquisition, Goodwill, Non-deductible Amount   27,354,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 5,200,000 5,224,000    
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets   (15,693,000)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   501,285,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits   385,624,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances   30,672,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures   4,735,000    
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities   8,629,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   429,660,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   71,625,000    
Aggregate Total Of Cash Paid In Business Combination $ 10,275,000 10,275,000    
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable   61,350,000    
Business Combination, Value of Total Consideration Paid   71,625,000    
Business Combination, Acquisition Related Costs     $ 3,100,000  
Finite-Lived Intangible Asset, Useful Life 10 years      
Acquired Book Value [Member] | First BancTrust [Member]        
Business Acquisition [Line Items]        
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand   20,598,000    
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities   (59,906,000)    
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans   (371,156,000)    
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses   (4,412,000)    
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets   (547,000)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment   (10,126,000)    
Business Acquisition, Goodwill, Non-deductible Amount   543,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   0    
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets   (16,389,000)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   474,853,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits   384,323,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances   31,000,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures   6,186,000    
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities   8,665,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   430,174,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   44,679,000    
Fair Value Adjustment [Member] | First BancTrust [Member]        
Business Acquisition [Line Items]        
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand      
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities $ (320,000) (320,000)    
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans   (8,298,000)    
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses   (4,412,000)    
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets (12,000) (12,000)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment (689,000) (689,000)    
Business Acquisition, Goodwill, Non-deductible Amount   26,811,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   5,224,000    
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets   (696,000)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   26,432,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits 1,301,000 1,301,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances (328,000) (328,000)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures $ (1,451,000) (1,451,000)    
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities   (36,000)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   (514,000)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   26,946,000    
Fair Value Adjustments, Accretable portion [Member] | First BancTrust [Member]        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans   $ 4,100,000