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Acquisitions and Preliminary Purchase Price Allocation Acquisitions and Preliminary Purchase Price Allocation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 12 Months Ended |
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Dec. 31, 2018 | Dec. 07, 2018
Farmers Deposit Bancorp, Inc. |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00%
Business Acquisition, Share Price |  | $ 1,174.14
Payments to Acquire Businesses, Gross | $ 24,900 |
Premium on Time Deposits |  | $ 100
Core deposit intangible |  | $ 3,334
Poage Bankshares, Inc. |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00%
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 1.1 |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  | $ 82,600
Business Acquisition, Share Price |  | $ 24.22
Payments to Acquire Businesses, Gross | $ 83,936 |
Premium on Time Deposits |  | $ 1,700
Core deposit intangible |  | 8,054
Poage and Farmers |  |
Business Acquisition [Line Items] |  |
Payments to Acquire Businesses, Gross | $ 108,836 |
Premium on Time Deposits Amortization Period | 5 years |
Core deposit intangible |  | $ 11,388
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |

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