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Acquisitions and Preliminary Purchase Price Allocation Acquisitions and Preliminary Purchase Price Allocation Assets Acquired (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 07, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 108,941,000 | $ 109,567,000 |  | $ 76,196,000
Farmers Deposit Bancorp, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross |  | 24,900,000 |  |
Business Combination, Consideration Transferred | 24,900,000 | 24,900,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  | $ 4,173,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities |  |  | 46,235,000 |
Business Combination, Fair Value of Loans Acquired |  |  | 58,485,000 |
Business Combination, Purchase Price Allocation, Bank Owned Life Insurance |  |  | 0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  | 568,000 |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets |  |  | 25,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  | 2,302,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  | 111,788,000 |
Business Combination, Purchase Price Allocation, Deposits |  |  | 92,241,000 |
Business Combination, Purchase Price Allocation, Short-Term Debt |  |  | 2,025,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  | 0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  |  | 650,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  | 94,916,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  | 16,872,000 |
Goodwill |  |  | 4,694,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | 3,334,000 |
Poage Bankshares, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross |  | 16,000 |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  | 82,565,000 |
Business Combination, Consideration Transferred, Other |  | 1,355,000 |  |
Business Combination, Consideration Transferred | 83,936,000 | 83,936,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  | 34,325,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities |  |  | 72,321,000 |
Business Combination, Fair Value of Loans Acquired |  |  | 304,359,000 |
Business Combination, Purchase Price Allocation, Bank Owned Life Insurance |  |  | 7,439,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  | 4,547,000 |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets |  |  | 2,454,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  | 8,757,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  | 434,202,000 |
Business Combination, Purchase Price Allocation, Deposits |  |  | 379,285,000 |
Business Combination, Purchase Price Allocation, Short-Term Debt |  |  | 0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  | 4,053,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  |  | 3,032,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  | 386,370,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  | 47,832,000 |
Goodwill |  |  | 28,050,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | 8,054,000 |
Poage and Farmers [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross |  | 24,916,000 |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  | 82,565,000 |
Business Combination, Consideration Transferred, Other |  | 1,355,000 |  |
Business Combination, Consideration Transferred | $ 108,836,000 | $ 108,836,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  | 38,498,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities |  |  | 118,556,000 |
Business Combination, Fair Value of Loans Acquired |  |  | 362,844,000 |
Business Combination, Purchase Price Allocation, Bank Owned Life Insurance |  |  | 7,439,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  | 5,115,000 |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets |  |  | 2,479,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  | 11,059,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  | 545,990,000 |
Business Combination, Purchase Price Allocation, Deposits |  |  | 471,526,000 |
Business Combination, Purchase Price Allocation, Short-Term Debt |  |  | 2,025,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  | 4,053,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  |  | 3,682,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  | 481,286,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  | 64,704,000 |
Goodwill |  |  | 32,744,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | $ 11,388,000 |

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