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Business Combinations Pro Forma Information (Details) - First BancTrust [Member] - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Business Acquisition [Line Items] |  |  |  |
Business Acquisitions Pro Forma Net Interest Income | $ 29,062,000 | $ 29,305,000 | $ 57,035,000 | $ 55,917,000
Business Acquisitions Pro Forma Provision For Loan Losses | 1,927,000 | 1,910,000 | 3,132,000 | 3,867,000
Business Acquisitions Pro Forma Non-Interest Income | 8,640,000 | 8,675,000 | 16,960,000 | 17,214,000
Business Acquisitions Pro Forma Non-Interest Expense | 21,870,000 | 24,885,000 | 43,654,000 | 46,945,000
Business Acquisitions Pro Forma Income before Income Taxes | 13,905,000 | 11,185,000 | 27,209,000 | 22,319,000
Business Acquisitions Pro Forma, Income Tax Expense | 3,307,000 | 3,505,000 | 6,715,000 | 7,323,000
Business Acquisition, Pro Forma Net Income (Loss) | $ 10,598,000 | $ 7,680,000 | $ 20,494,000 | $ 14,996,000
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ 760 | $ 510 | $ 1,420 | $ 1,060
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ 760 | $ 510 | $ 1,420 | $ 1,060
Weighted Average Basic Shares Outstanding, Pro Forma | 13,956,674 | 15,092,373 | 14,407,273 | 14,127,688
Pro Forma Weighted Average Shares Outstanding, Diluted | 13,974,048 | 15,100,547 | 14,424,576 | 14,135,862
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual | $ 4,298,000 |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual | $ 919,000 |  |  |

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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