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Business Combinations Pro Forma Information (Details) - USD ($) $ / shares in Units, shares in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
OldNationalBankBranches [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisitions Pro Forma Net Interest Income |  | $ 66,680,000
Business Acquisitions Pro Forma Provision For Loan Losses |  | 1,483,000
Business Acquisitions Pro Forma Non-Interest Income |  | 26,001,000
Business Acquisitions Pro Forma Non-Interest Expense |  | 59,944,000
Business Acquisitions Pro Forma Income before Income Taxes |  | 31,254,000
Business Acquisitions Pro Forma, Income Tax Expense |  | 11,207,000
Business Acquisition, Pro Forma Net Income (Loss) |  | 20,047,000
Pro Forma Earnings Per Share |  |
Business Acquisitions Pro Forma, Dividends On Preferred Shares |  | 2,200,000
Business Acquisitions Pro Forma, Net Income Available To Common Stockholders |  | $ 17,847,000
Business Acquisition, Pro Forma Earnings Per Share, Basic |  | $ 2,300
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  | $ 2,190
Weighted Average Basic Shares Outstanding, Pro Forma |  | 7,775,490
Pro Forma Weighted Average Shares Outstanding, Diluted |  | 9,137,689
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual | $ 3,270,000 |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual | (228,380) |
First Clover Leaf [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisitions Pro Forma Net Interest Income | 85,004,000 | $ 76,619,000
Business Acquisitions Pro Forma Provision For Loan Losses | 3,556,000 | 1,548,000
Business Acquisitions Pro Forma Non-Interest Income | 29,118,000 | 23,217,000
Business Acquisitions Pro Forma Non-Interest Expense | 73,997,000 | 66,864,000
Business Acquisitions Pro Forma Income before Income Taxes | 36,569,000 | 31,424,000
Business Acquisitions Pro Forma, Income Tax Expense | 12,910,000 | 10,671,000
Business Acquisition, Pro Forma Net Income (Loss) | 23,659,000 | 20,753,000
Pro Forma Earnings Per Share |  |
Business Acquisitions Pro Forma, Dividends On Preferred Shares | 825,000 | 1,650,000
Business Acquisitions Pro Forma, Net Income Available To Common Stockholders | $ 22,834,000 | $ 19,103,000
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ 2,250 | $ 2,390
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ 2,220 | $ 2,220
Weighted Average Basic Shares Outstanding, Pro Forma | 10,149,099 | 7,985,089
Pro Forma Weighted Average Shares Outstanding, Diluted | 10,663,710 | 9,347,288
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual | $ 7,417,000 |

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