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Goodwill and Intangible Assets Reconciliation of purchase price to goodwill recorded (Details) - USD ($) |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 08, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2016 | Dec. 01, 2015 | Aug. 14, 2015
Reconciliation of purchase price to goodwill recorded [Line Items] |  |  |  |  |  |  |
Fair value of premises and equipment |  |  |  |  |  |  | $ (4,422,000)
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 [Member] |  |  |  |  |  |  |
Reconciliation of purchase price to goodwill recorded [Line Items] |  |  |  |  |  |  |
Business Combination, Purchase Price | $ 8,741,000 |  |  |  |  |  |
Fair value of securities | 109,174,000 |  |  |  |  |  |
Fair value of OREO | 1,987,000 |  |  |  |  |  |
Fair value of premises and equipment | (11,581,000) |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | 438,265,000 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | 536,686,000 |  |  |  |  |  |
Fair value of FHLB advances | 15,113,000 |  |  |  |  |  |
Fair value of subordinated debentures | (3,269,000) |  |  |  |  |  |
Business Combination, Net Fair Value Adjustments | 8,044,000 |  |  |  |  |  |
Goodwill, Acquired During Period | 16,785,000 | $ 16,785,000 |  |  |  |  |
OldNationalBankBranches [Member] |  |  |  |  |  |  |
Reconciliation of purchase price to goodwill recorded [Line Items] |  |  |  |  |  |  |
Business Combination, Purchase Price |  |  |  |  |  |  | 15,892,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  | $ 4,500,000 |  |
Business Combination, Net Fair Value Adjustments |  |  |  |  |  |  | (1,618,000)
Goodwill, Acquired During Period |  |  |  | $ 14,274,000 |  |  |
Illiana [Member] |  |  |  |  |  |  |
Reconciliation of purchase price to goodwill recorded [Line Items] |  |  |  |  |  |  |
Business Combination, Purchase Price |  |  |  |  |  | $ 2,807,000 |
Goodwill, Acquired During Period |  |  | $ 980,000 |  |  |  |
Fair Value Adjustments [Member] |  |  |  |  |  |  |
Reconciliation of purchase price to goodwill recorded [Line Items] |  |  |  |  |  |  |
Fair value of premises and equipment |  |  |  |  |  |  | 125,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  |  |  |  |  |  | (3,377,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  |  |  |  |  |  | 837,000
Fair Value Adjustments [Member] | First Clover Leaf [Member] |  |  |  |  |  |  |
Reconciliation of purchase price to goodwill recorded [Line Items] |  |  |  |  |  |  |
Fair value of securities | 737,000 |  |  |  |  |  |
Fair value of loans | 3,475,000 |  |  |  |  |  |
Fair value of OREO | 754,000 |  |  |  |  |  |
Fair value of premises and equipment | (1,963,000) |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | 10,403,000 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | 1,994,000 |  |  |  |  |  |
Fair value of FHLB advances | 113,000 |  |  |  |  |  |
Fair value of subordinated debentures | (731,000) |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | (4,660,000) |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets, Net | 8,325,000 |  |  |  |  |  |
Goodwill, Acquired During Period | $ 5,400,000 |  |  |  |  |  |
Fair Value Adjustments [Member] | OldNationalBankBranches [Member] |  |  |  |  |  |  |
Reconciliation of purchase price to goodwill recorded [Line Items] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  |  |  |  |  |  | 3,377,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  | 125,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  |  |  |  |  |  | 837,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  | $ 6,216,000
Fair Value Adjustments [Member] | Illiana [Member] |  |  |  |  |  |  |
Reconciliation of purchase price to goodwill recorded [Line Items] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  | $ 1,827,000 |

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