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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 |  |
--- | --- | --- | ---
Dec. 31, 2018 | Mar. 31, 2019 | Dec. 07, 2018
Business Acquisition [Line Items] |  |  |
Goodwill | $ 109,567 | $ 108,977 |
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
Goodwill |  | 4,700 | $ 4,677
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
Goodwill |  | $ 28,100 | 28,105
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 |  |
Goodwill |  |  | $ 32,782

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