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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, 2018 | Dec. 07, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 109,567,000 |  | $ 76,196,000 | $ 76,196,000
Farmers Deposit Bancorp, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross | 24,900,000.00 |  |  |
Business Combination, Consideration Transferred | 24,900,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | $ 4,209,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities |  | 46,235,000 |  |
Business Combination, Fair Value of Loans Acquired |  | 58,477,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 768,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  | (188,000) |  |
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 |  | 111,803,000 |  |
Business Acquisition, 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, Other |  | 709,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 94,975,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 16,828,000 |  |
Goodwill |  | 4,738,000 |  |
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 Combination, Consideration Transferred, Other | 1,355,000 |  |  |
Business Combination, Consideration Transferred | 83,936,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | 34,288,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities |  | 72,321,000 |  |
Business Combination, Fair Value of Loans Acquired |  | 304,023,000 |  |
Business Acquisition, 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 |  | 2,300,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  | 8,799,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 433,717,000 |  |
Business Acquisition, Purchase Price Allocation, Deposits |  | 379,285,000 |  |
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 |  | 3,130,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 386,468,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 47,249,000 |  |
Goodwill |  | 28,633,000 |  |
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 Combination, Consideration Transferred, Other | 1,355,000 |  |  |
Business Combination, Consideration Transferred | $ 108,836,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | 38,497,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities |  | 118,556,000 |  |
Business Combination, Fair Value of Loans Acquired |  | 362,500,000 |  |
Business Acquisition, Purchase Price Allocation, Bank Owned Life Insurance |  | 7,439,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 5,315,000 |  |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets |  | 2,112,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  | 11,101,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 545,520,000 |  |
Business Acquisition, 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 |  | 3,839,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 481,443,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 64,077,000 |  |
Goodwill |  | 33,371,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | $ 11,388,000 |  |

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