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Business Combinations Narrative (FCL) (Details) | Sep. 08, 2016 USD ($) $ / shares shares | Mar. 31, 2017 $ / shares | Dec. 31, 2016 $ / shares
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Business Acquisition [Line Items] |  |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 4 | $ 4
Goodwill, Acquired During Period | $ 16,785,000 |  |
First Clover Leaf [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Of Acquiree Outstanding Stock Being Acquired In Merger | 1.00 |  |
Percentage of business acquisition consideration paid in cash | 25.00% |  |
Right To Receive Value of Cash Option | $ / shares | $ 12.87 |  |
Aggregate Total Of Cash Paid In Business Combination | $ 22,545,000 |  |
Portion of Business Acquisition Consideration Paid In Common Stock | 75.00% |  |
Right To Receive Value Of Share Option | shares | 0.495 |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 2,600,616 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 668,905,000 |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | 438,265,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | 536,686,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment | 11,581,000 |  |
Goodwill, Acquired During Period | 16,800,000 |  |
Business Acquisition Deposit Premium on Core Deposits | 8,741,000 |  |
Acquired Book Value [Member] | First Clover Leaf [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 658,788,000 |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | 448,668,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | 534,692,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment | $ 9,618,000 |  |

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