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Basis of Accounting and Consolidation Basis of Accounting and Consolidation 5 (Acquisitions)
 3 Months Ended
Sep. 08, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
branch
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
Aug. 14, 2015
USD ($)
Jun. 18, 2015
$ / shares
Agreement And Plan Of Merger FCLB [Abstract]          
Common stock, par value (in dollars per share) | $ / shares   $ 4 $ 4    
CS: Number of Shares, Par Value and Other (Capital Raise) [Abstract]          
Stock Issued During Period, Shares, New Issues | shares   1,392,859      
Shares Issued, Price Per Share | $ / shares         $ 21.00
Stock Issued During Period, Value, New Issues   $ 29,250,039      
OldNationalBankBranches [Member]          
Branch Purchase and Assumption Agreement ONB [Abstract]          
Number of Businesses Acquired | branch   12      
Fair value of loans     $ 156,000,000 $ 152,397,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits     $ 453,000,000 $ 453,647,000  
First Clover Leaf [Member]          
Branch Purchase and Assumption Agreement ONB [Abstract]          
Fair value of loans $ 438,265,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits $ 536,686,000        
Agreement And Plan Of Merger FCLB [Abstract]          
Percent Of Acquiree Outstanding Stock Being Acquired In Merger 1.00        
Percentage of business acquisition consideration paid in cash 25.00%        
Right To Receive Value of Cash Option | $ / shares $ 12.87        
Aggregate Total Of Cash Paid In Business Combination $ 22,545,000        
Portion of Business Acquisition Consideration Paid In Common Stock 75.00%        
Right To Receive Value Of Share Option | shares 0.495        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares 2,600,616