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Business Combinations Assets Acquired and Liabilities Assumed (Details) - USD ($)
 9 Months Ended
May 01, 2018
Sep. 30, 2018
Sep. 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 (363,281,000)    
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 26,491,000    
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 (16,133,000)    
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    
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   $ 7,100,000  
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)    
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans (7,875,000)    
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)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment (689,000)    
Business Acquisition, Goodwill, Non-deductible Amount 25,948,000    
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 (256,000)    
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    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances (328,000)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures (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 $ 3,600,000