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Business Combinations Narrative (ONB) (Details) |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 08, 2016 USD ($) | Sep. 30, 2016 branch | Dec. 31, 2015 USD ($) | Aug. 14, 2015 USD ($)
OldNationalBankBranches [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
number of bank branches acquired | branch |  | 12 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  |  | $ 453,000,000 | $ 453,647,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  |  | $ 156,000,000 | $ 152,397,000
Business Acquisition Deposit Premium Rate On Core Deposits |  |  |  | 0.036
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, Premises And Equipment |  |  |  | 4,422,000
OldNationalBankBranches [Member] | Acquired Book Value [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  |  |  | 452,810,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  |  |  | 155,774,000
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand |  |  |  | 2,700,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment |  |  |  | 4,547,000
Business Combination Cash Settlement |  |  |  | $ 276,800,000
First Clover Leaf [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percent Of Acquiree Outstanding Stock Being Acquired In Merger | 1.00 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | $ 536,686,000 |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | 438,265,000 |  |  |
Business Acquisition Deposit Premium on Core Deposits | 8,741,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment | 11,581,000 |  |  |
First Clover Leaf [Member] | Acquired Book Value [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | 534,692,000 |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | 448,668,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment | $ 9,618,000 |  |  |

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