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Business Combinations Assets Acquired and Liabilities Assumed (Details) | 9 Months Ended |  |  |  |
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Sep. 30, 2016 USD ($) | Sep. 08, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Aug. 14, 2015 USD ($)
First Clover Leaf [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand |  | $ 59,320,000 |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities |  | (109,174,000) |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  | (438,265,000) |  |  |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses |  | 0 |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets |  | (1,987,000) |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment |  | (11,581,000) |  |  |
Business Acquisition, Goodwill, Non-deductible Amount |  | 16,785,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 4,660,000 |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets |  | (27,133,000) |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 668,905,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  | 536,686,000 |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase |  | 23,263,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances |  | 15,113,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures |  | 3,269,000 |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities |  | 2,103,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 580,434,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 88,471,000 |  |  |
Aggregate Total Of Cash Paid In Business Combination |  | 22,545,000 |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  | 65,926,000 |  |  |
Business Acquisition, Transaction Costs | $ 785,000 |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |  |  |
Business Combination, Value of Total Consideration Paid |  | 88,471,000 |  |  |
OldNationalBankBranches [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand |  |  |  |  | $ 279,468,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  |  | $ (156,000,000) |  | (152,397,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment |  |  |  |  | (4,422,000)
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  | 14,274,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  | 6,216,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets |  |  |  |  | (1,174,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  | 457,951,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  |  | $ 453,000,000 |  | 453,647,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase |  |  |  |  | 3,797,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities |  |  |  |  | 507,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  | $ 457,951,000
Business Acquisition, Transaction Costs |  |  |  | $ 1,400,000 |
Business Acquisition Deposit Premium Rate On Core Deposits |  |  |  |  | 0.036
Acquired Book Value [Member] | First Clover Leaf [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand |  | 59,320,000 |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities |  | (109,911,000) |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  | (448,668,000) |  |  |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses |  | (6,928,000) |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets |  | (2,741,000) |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment |  | (9,618,000) |  |  |
Business Acquisition, Goodwill, Non-deductible Amount |  | 11,385,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 99,000 |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets |  | (23,974,000) |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 658,788,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  | 534,692,000 |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase |  | 23,263,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances |  | 15,000,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures |  | 4,000,000 |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities |  | 2,103,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 579,058,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 79,730,000 |  |  |
Acquired Book Value [Member] | OldNationalBankBranches [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand |  |  |  |  | $ 279,468,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  |  |  |  | (155,774,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment |  |  |  |  | (4,547,000)
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  | 0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  | 0
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets |  |  |  |  | (1,433,000)
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 Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase |  |  |  |  | 3,797,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities |  |  |  |  | 507,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  | 457,114,000
Fair Value Adjustment [Member] | First Clover Leaf [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand |  | 0 |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities |  | (737,000) |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  | (10,403,000) |  |  |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses |  | 6,928,000 |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets |  | (754,000) |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment |  | 1,963,000 |  |  |
Business Acquisition, Goodwill, Non-deductible Amount |  | 5,400,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 4,561,000 |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets |  | 3,159,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 10,117,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  | 1,994,000 |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase |  | 0 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances |  | 113,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures |  | (731,000) |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities |  | 0 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 1,376,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 8,741,000 |  |  |
Fair Value Adjustment [Member] | OldNationalBankBranches [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand |  |  |  |  | 0
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  |  |  |  | (3,377,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment |  |  |  |  | (125,000)
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  | 14,274,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  | 6,216,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets |  |  |  |  | 259,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  | 16,729,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  |  |  |  | 837,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase |  |  |  |  | 0
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities |  |  |  |  | 0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  | $ 837,000
Fair Value Adjustments, Accretable portion [Member] | First Clover Leaf [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  | $ 8,400,000 |  |  |

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