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Basis of Accounting and Consolidation Basis of Accounting and Consolidation-Acquisitions (Details)
 3 Months Ended
Jun. 30, 2016
branch
$ / shares
shares
Jun. 30, 2015
USD ($)
shares
Apr. 26, 2016
$ / shares
Dec. 31, 2015
$ / shares
Aug. 14, 2015
USD ($)
Jun. 18, 2015
$ / shares
Agreement And Plan Of Merger [Abstract]            
Common stock, par value (in dollars per share) | $ / shares $ 4     $ 4    
Common Stock, Number of Shares, Par Value and Other Disclosures [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 [Abstract]            
Number of Businesses Acquired | branch 12          
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans         $ 152,397,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits         453,647,000  
First Clover Leaf Financial [Member]            
Agreement And Plan Of Merger [Abstract]            
Percent Of Acquiree Outstanding Stock Being Acquired In Merger 1          
Par Value Of Outstanding Stock Being Acquired In Merger | $ / shares     $ 0.10      
Right To Receive Value of Cash Option | $ / shares $ 12.87          
Right To Receive Value Of Share Option | shares 0.495          
Acquired Book Value [Member] | OldNationalBankBranches [Member]            
Branch Purchase and Assumption Agreement [Abstract]            
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans         155,774,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits         $ 452,810,000