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Business Combinations Narrative (Details) |  | 3 Months Ended | 12 Months Ended |  |
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Sep. 08, 2016 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2015 USD ($) | Dec. 31, 2016 USD ($) branch $ / shares Rate | Dec. 31, 2015 $ / shares | Aug. 14, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
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 |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 4 | $ 4 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  | $ 457,951,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  |  |  |  |  | 453,647,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  |  |  |  |  | 152,397,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  |  |  |  | 279,468,000
First Clover Leaf [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
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 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 4.00 |  |  |  |  |
Shares, Issued | shares | 2,600,616 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 668,905,000 |  |  |  |  |
Goodwill, Acquired During Period | 16,785,000 | $ 16,785,000 |  |  |  |
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 Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 59,320,000 |  |  |  |  |
OldNationalBankBranches [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period |  |  | $ 14,274,000 |  |  |
number of bank branches acquired | branch |  |  |  | 12 |  |
Business Acquisition Deposit Premium Rate On Core Deposits | Rate |  |  |  | 3.60% |  |
Business Acquisition Deposit Premium on Core Deposits |  |  |  | $ 15,900,000 |  |
Business Combinations Fixed Deposit Premium For Municipal Deposits |  |  |  | 500,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  | 4,500,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  |  | 2,700,000 |  |
Business Combination Cash Settlement |  |  |  | 276,800,000 |  |
Acquired Book Value [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  | 441,222,000
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
Acquired Book Value [Member] | First Clover Leaf [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 658,788,000 |  |  |  |  |
Goodwill, Acquired During Period | 11,385,000 |  |  |  |  |
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, Cash and Equivalents | $ 59,320,000 |  |  |  |  |
Acquired Book Value [Member] | OldNationalBankBranches [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  |  |  | 453,000,000 |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  |  |  | $ 156,000,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  |  |  |  | $ 279,468,000

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