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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 08, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill and Intangible Assets Gross Carrying Value [Abstract] |  |  |  |  |  |  |
Goodwill not subject to amortization |  |  | $ 44,767 |  | $ 61,551 | $ 44,767 |
Intangibles from branch acquisition |  |  | 3,015 |  | 3,015 | 3,015 |
Core deposit intangibles |  |  | 15,202 |  | 19,862 | 15,202 |
Customer list intangibles |  |  | 3,731 |  | 3,731 | 3,731 |
Total Goodwill and Intangible Assets, Gross Carrying Value |  |  | 66,715 |  | 88,159 | 66,715 |
Goodwill and Intangible Assets Accumulated Amortization [Abstract] |  |  |  |  |  |  |
Goodwill not subject to amortization (effective 1/1/02), Accumulated Amortization |  |  | 3,760 |  | 3,760 | 3,760 |
Total Goodwill and Intangible Assets, Accumulated Amortization |  |  | 16,711 |  | 18,521 | 16,711 |
Total Amortization Expense [Abstract] |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  | 1,909 | 891 | $ 643
Estimated amortization expense [Abstract] |  |  |  |  |  |  |
For year ended 12/31/17 |  |  |  |  | 1,496 |  |
For year ended 12/31/18 |  |  |  |  | 1,365 |  |
For year ended 12/31/19 |  |  |  |  | 1,243 |  |
For year ended 12/31/20 |  |  |  |  | 1,097 |  |
For year ended 12/31/21 |  |  |  |  | 875 |  |
First Clover Leaf [Member] |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |
Goodwill, Acquired During Period | $ 16,785 | $ 16,785 |  |  |  |  |
OldNationalBankBranches [Member] |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  | $ 14,274 |  |  |
Illiana [Member] |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  | 980 |  |  |  |
Intangibles from branch acquisitions |  |  |  |  |  |  |
Goodwill and Intangible Assets Accumulated Amortization [Abstract] |  |  |  |  |  |  |
Intangible Assets, Accumulated Amortization |  |  | 3,015 |  | 3,015 | 3,015 |
Core deposit intangibles |  |  |  |  |  |  |
Goodwill and Intangible Assets Accumulated Amortization [Abstract] |  |  |  |  |  |  |
Intangible Assets, Accumulated Amortization |  |  | 8,017 |  | 9,644 | 8,017 |
Total Amortization Expense [Abstract] |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  | 1,628 | 876 | 643
Customer list intangibles |  |  |  |  |  |  |
Goodwill and Intangible Assets Accumulated Amortization [Abstract] |  |  |  |  |  |  |
Intangible Assets, Accumulated Amortization |  |  | $ 1,919 |  | 2,102 | 1,919 |
Total Amortization Expense [Abstract] |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  | 183 | 15 | 0
Mortgage Servicing Rights [Member] |  |  |  |  |  |  |
Total Amortization Expense [Abstract] |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  | $ 98 | $ 0 | $ 0

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- Definition Gross amount, as of the balance sheet date, of the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable), in excess of the fair value of net assets acquired in one or more business combination transactions. This amount includes the gross amount of intangibles from acquisitions and other major intangibles. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Bank deposits belonging to an acquired bank that can be counted on as a stable source of lending funds. These deposits have the following attributes: predictable costs and low sensitivity to interest rates. This intangible asset is usually amortized over its estimated useful life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of an asset comprised of customer information, acquired in a business combination or other transaction, having a finite beneficial life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the third rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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