XML 57 R37.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Retirement Plans (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2018
Defined Benefit Plan [Abstract] |
Net period benefit cost for the pension and postretirement plans | The components of net periodic benefit cost for the RAP, Bank Mutual Pension Plan, and Postretirement Plan for three and six months ended June 30, 2018 and 2017 were as follows.
| Three Months Ended June 30, | Six Months Ended June 30,
| 2018 |  | 2017 | 2018 |  | 2017
| ($ in Thousands)
Components of Net Periodic Benefit Cost |  |  |  |  |  |
RAP |  |  |  |  |  |
Service cost | $ | 1,893 |  |  | $ | 1,782 |  | $ | 3,785 |  |  | $ | 3,563 |
Interest cost | 1,660 |  |  | 1,756 |  | 3,320 |  |  | 3,512 |
Expected return on plan assets | (4,755 | ) |  | (4,882 | ) | (9,510 | ) |  | (9,763 | )
Amortization of prior service cost | (19 | ) |  | (18 | ) | (38 | ) |  | (37 | )
Amortization of actuarial loss | 463 |  |  | 487 |  | 925 |  |  | 975 |
Total net pension cost | $ | (759 | ) |  | $ | (875 | ) | $ | (1,518 | ) |  | $ | (1,750 | )
Bank Mutual Pension Plan(a) |  |  |  |  |  |
Interest cost | $ | 650 |  |  | N/A |  | $ | 1,083 |  |  | N/A |
Expected return on plan assets | (1,060 | ) |  | N/A |  | (1,592 | ) |  | N/A |
Total net pension cost | $ | (410 | ) |  | N/A |  | $ | (509 | ) |  | N/A |
Postretirement Plan(b) |  |  |  |  |  |
Interest cost | $ | 27 |  |  | $ | 24 |  | $ | 53 |  |  | $ | 48 |
Amortization of prior service cost | (19 | ) |  | (19 | ) | (38 | ) |  | (38 | )
Amortization of actuarial loss | 2 |  |  | — |  | 4 |  |  | — |
Total net periodic benefit cost | $ | 10 |  |  | $ | 5 |  | $ | 19 |  |  | $ | 10 |

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPensionPlansAndDefinedBenefitPostretirementPlansDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration