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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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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.

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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.

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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.

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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.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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.

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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.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the fourth 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.

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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.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the second 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.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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.

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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