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Employee Benefits - Salary continuation plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Appreciation in cash surrender value of bank owned life insurance | $ 621 | $ 558 | $ 596
Annual tax free interest rate on life insurance policies | 3.97% |  |
Salary Continuation [Member] | Certain Key Executives [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Contractual term | 15 years |  |
Salary continuation plans, expense for period | $ 561 | 489 | 447
Total liability | 5,786 | 5,572 |
Cash surrender value of life insurance | 6,355 | 6,196 |
Appreciation in cash surrender value of bank owned life insurance | 159 | 159 | 167
Salary Continuation [Member] | Service 1st Bank | Certain Key Executives [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Salary continuation plans, expense for period | 163 | 120 | 78
Total liability | 4,557 | 2,788 |
Cash surrender value of life insurance | 15,326 | 11,014 |
Appreciation in cash surrender value of bank owned life insurance | $ 315 | $ 298 | $ 194

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- Definition Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 + Details
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