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Employee Benefit and Deferred Compensation Plans - (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Pension Benefits |  |  |  |
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans |  |  |  |
Service cost | $ 0 | $ 0 | $ 0 | $ 0
Interest cost | 291 | 302 | 584 | 608
Expected return on plan assets | (487) | (467) | (971) | (936)
Recognized actuarial loss | 100 | 102 | 200 | 202
Net periodic benefit (return) cost | (96) | (63) | (187) | (126)
Pension Benefits | Heritage Financial Group |  |  |  |
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans |  |  |  |
Service cost | 0 | 0 | 0 | 0
Interest cost | 0 | 69 | 0 | 138
Expected return on plan assets | 0 | (45) | 0 | (90)
Recognized actuarial loss | 0 | 0 | 0 | 0
Net periodic benefit (return) cost | 0 | 24 | 0 | 48
Other Benefits |  |  |  |
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans |  |  |  |
Service cost | 1 | 4 | 4 | 8
Interest cost | 8 | 15 | 21 | 29
Expected return on plan assets | 0 | 0 | 0 | 0
Recognized actuarial loss | (10) | 17 | 3 | 34
Net periodic benefit (return) cost | $ (1) | $ 36 | $ 28 | $ 71

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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