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Business Combinations Narrative (Details) - OldNationalBankBranches [Member]
 6 Months Ended
Jun. 30, 2016
branch
Aug. 14, 2015
USD ($)
Business Acquisition [Line Items]    
number of bank branches acquired | branch 12  
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans   $ 152,397,000
Business Acquisition Deposit Premium on Core Deposits   15,892,000
Business Combinations Fixed Deposit Premium For Municipal Deposits   500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits   453,647,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment   4,422,000
Acquired Book Value [Member]    
Business Acquisition [Line Items]    
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
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment   4,547,000
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand   2,700,000
Business Combination Cash Settlement   $ 276,800,000