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Goodwill and Intangible Assets Reconciliation of Purchase Price to Goodwill (Details) - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 08, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Dec. 01, 2015 | Aug. 14, 2015
Reconciliation of purchase price to goodwill recorded [Line Items] |  |  |  |  |
Business Combination, Net Fair Value Adjustments | $ 8,044 |  |  |  |
Resulting goodwill from acquisition | 16,785 |  |  |  |
First Clover Leaf [Member] |  |  |  |  |
Reconciliation of purchase price to goodwill recorded [Line Items] |  |  |  |  |
Purchase price (in excess of net book value) | 8,741 |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities | 109,174 |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets | 1,987 |  |  |  |
Fair value of premises and equipment | 11,581 |  |  |  |
Fair value of time deposits | 536,686 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances | 15,113 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures | 3,269 |  |  |  |
Resulting goodwill from acquisition | 16,800 | $ 16,800 |  |  |
First Clover Leaf [Member] | Fair Value Adjustment [Member] |  |  |  |  |
Reconciliation of purchase price to goodwill recorded [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities | 737 |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans, net | 3,475 |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets | 754 |  |  |  |
Fair value of premises and equipment | (1,963) |  |  |  |
Fair value of time deposits | 1,994 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances | 113 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures | (731) |  |  |  |
Core deposit intangible | 4,660 |  |  |  |
Other assets | $ 8,325 |  |  |  |
Illiana [Member] |  |  |  |  |
Reconciliation of purchase price to goodwill recorded [Line Items] |  |  |  |  |
Purchase price (in excess of net book value) |  |  |  | $ 2,807 |
Business Combination, Net Fair Value Adjustments |  |  |  | $ (1,827) |
Resulting goodwill from acquisition |  |  | $ 980 |  |
OldNationalBankBranches [Member] |  |  |  |  |
Reconciliation of purchase price to goodwill recorded [Line Items] |  |  |  |  |
Purchase price (in excess of net book value) |  |  |  |  | $ 15,892
Fair value of premises and equipment |  |  |  |  | 4,422
Fair value of time deposits |  |  | 453,000 |  | 453,647
Business Combination, Net Fair Value Adjustments |  |  |  |  | (1,618)
Resulting goodwill from acquisition |  |  | $ 14,274 |  |
OldNationalBankBranches [Member] | Fair Value Adjustment [Member] |  |  |  |  |
Reconciliation of purchase price to goodwill recorded [Line Items] |  |  |  |  |
Fair value of premises and equipment |  |  |  |  | 125
Fair value of time deposits |  |  |  |  | 837
Core deposit intangible |  |  |  |  | $ (6,216)

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