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Business Combinations Business Combinations Narrative (Details) |  |  |  | 6 Months Ended |
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May 01, 2018 USD ($) $ / shares shares | Dec. 11, 2017 USD ($) $ / shares shares | Sep. 08, 2016 USD ($) | Jun. 30, 2018 USD ($) $ / shares | Jun. 30, 2017 USD ($) | Dec. 31, 2017 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |
Aggregate Total Of Cash Paid In Business Combination |  |  |  | $ 10,275,000 | $ 0 |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 4 |  | $ 4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  | $ 501,285,000 |  |
First BancTrust [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percent Of Acquiree Outstanding Stock Being Acquired In Merger |  | 1.00 |  |  |  |
Par Value Of Outstanding Stock Being Acquired In Merger | $ / shares |  | $ 0.01 |  |  |  |
Right To Receive Value of Cash Option | $ / shares |  | $ 5.00 |  |  |  |
Aggregate Total Of Cash Paid In Business Combination | $ 10,275,000 |  | $ 10,275,000 |  |  |
Right To Receive Value Of Share Option | shares |  | 0.800 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  | 501,285,000 |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  |  | 362,858,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  |  | 385,624,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment |  |  | 9,437,000 |  |  |
Goodwill, Acquired During Period | $ 27,354,000 | $ 27,400,000 |  |  |  |
Shares, Issued | shares | 1,643,900 |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 37.32 |  |  |  |  |
Acquired Book Value [Member] | First BancTrust [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  | 474,853,000 |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  |  | 371,156,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  |  | 384,323,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment |  |  | $ 10,126,000 |  |  |

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