XML 48 R37.htm IDEA: XBRL DOCUMENT
v3.20.2

Benefit Plans (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2020
Supplemental Retirement Plan |
Benefit plans |
Schedule of components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended |
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 |
​ | ​ | (Dollars in thousands) | ​
Components of net periodic benefit cost: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 123 | ​ | $ | 55 | ​ | $ | 246 | ​ | $ | 110 | ​
Interest cost | ​ |  | 236 | ​ |  | 264 | ​ |  | 467 | ​ |  | 528 | ​
Amortization of net actuarial loss | ​ |  | 105 | ​ |  | 46 | ​ |  | 190 | ​ |  | 92 | ​
Net periodic benefit cost | ​ | $ | 464 | ​ | $ | 365 | ​ | $ | 903 | ​ | $ | 730 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Split-Dollar Life Insurance Benefit Plan |
Benefit plans |
Schedule of components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended |
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 |
​ | ​ | (Dollars in thousands) | ​
Amortization of prior transition obligation | ​ | $ | (15) | ​ | $ | (24) | ​ | $ | (30) | ​ | $ | (49) | ​
Interest cost | ​ |  | 62 | ​ |  | 70 | ​ |  | 124 | ​ |  | 140 | ​
Net periodic benefit cost | ​ | $ | 47 | ​ | $ | 46 | ​ | $ | 94 | ​ | $ | 91 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of change in projected benefit obligation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31, |
​ | ​ | 2020 |  | 2019 | ​
​ | ​ | (Dollars in thousands) |
Change in projected benefit obligation: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Projected benefit obligation at beginning of year | ​ | $ | 8,198 | ​ | $ | 6,903 | ​
Interest cost | ​ |  | 124 | ​ |  | 278 | ​
Actuarial loss (gain) | ​ |  | — | ​ |  | 1,017 | ​
Projected benefit obligation at end of period | ​ | $ | 8,322 | ​ | $ | 8,198 | ​
Schedule of amounts recognized in accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31, |
​ | ​ | 2020 |  | 2019 | ​
​ | ​ | (Dollars in thousands) |
Net actuarial loss | ​ | $ | 3,851 | ​ | $ | 3,776 | ​
Prior transition obligation | ​ |  | 1,014 | ​ |  | 1,059 | ​
Accumulated other comprehensive loss | ​ | $ | 4,865 | ​ | $ | 4,835 | ​

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfChangesInProjectedBenefitObligationsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_DefinedBenefitPostretirementLifeInsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |