Business Combinations Narrative (Details)	3 Months Ended
	Mar. 31, 2016 branch	Dec. 31, 2015 USD ($)	Aug. 14, 2015 USD ($)
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans		$ 156,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits		$ 453,000,000
OldNationalBankBranches [Member]
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
OldNationalBankBranches [Member] | 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