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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS | COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS The components of net periodic expense for the Corporation’s pension and other benefit plans for the periods indicated are as follows (in thousands):
|  | Three Months Ended March 31,
|  | 2017 |  | 2016
Qualified Pension Plan |  |  |  |
Service cost, benefits earned during the period |  | $ | — |  |  | $ | 296 |
Interest cost on projected benefit obligation |  | 403 |  |  | 470 |
Expected return on plan assets |  | (785 | ) |  | (755 | )
Amortization of unrecognized transition obligation |  | — |  |  | — |
Amortization of unrecognized prior service cost |  | — |  |  | 2 |
Amortization of unrecognized net loss |  | 58 |  |  | 384 |
Net periodic pension cost |  | $ | (324 | ) |  | $ | 397 |
Supplemental Pension Plan |  |  |  |  |  |
Service cost, benefits earned during the period |  | $ | — |  |  | $ | 11 |
Interest cost on projected benefit obligation |  | 12 |  |  | 13 |
Expected return on plan assets |  | — |  |  | — |
Amortization of unrecognized prior service cost |  | — |  |  | — |
Amortization of unrecognized net loss |  | 1 |  |  | 6 |
Net periodic supplemental pension cost |  | $ | 13 |  |  | $ | 30 |
Postretirement Plan, Medical and Life |  |  |  |  |  |
Service cost, benefits earned during the period |  | $ | — |  |  | $ | 12 |
Interest cost on projected benefit obligation |  | 4 |  |  | 17 |
Expected return on plan assets |  | — |  |  | — |
Amortization of unrecognized prior service cost |  | (55 | ) |  | (24 | )
Amortization of unrecognized net loss |  | 29 |  |  | 6 |
Net periodic postretirement, medical and life cost |  | $ | (22 | ) |  | $ | 11 |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66047640&loc=d3e39622-114963 + Details
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