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Retirement Plans | 6 Months Ended
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Jun. 30, 2018
Defined Benefit Plan [Abstract] |
Retirement Plans | Retirement Plans The Corporation has a noncontributory defined benefit retirement plan (the Retirement Account Plan (“RAP”)) covering substantially all employees who meet participation requirements. The benefits are based primarily on years of service and the employee’s compensation paid. Employees of acquired entities generally participate in the RAP after consummation of the business combinations. Any retirement plans of acquired entities are typically merged into the RAP after completion of the mergers, and credit is usually given to employees for years of service at the acquired institution for vesting and eligibility purposes. The Corporation also provides legacy healthcare access to a limited group of retired employees from a previous acquisition in the Postretirement Plan. There are no other active retiree healthcare plans. Bank Mutual was acquired on February 1, 2018. The Bank Mutual Pension Plan has not yet been merged into the Corporation's Retirement Account Plan. However, Bank Mutual's Postretirement Plan was merged into the Corporation's Postretirement Plan during the first quarter of 2018. 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 |
(a) | The reported figures only include five months of expense due to the timing of the Bank Mutual acquisition. See Note 2 for additional information on the Bank Mutual acquisition.
(b) | The portion of the Postretirement Plan attributed to Bank Mutual's Postretirement Plan only includes five months of expense due to the timing of the Bank Mutual acquisition. See Note 2 for additional information on the Bank Mutual acquisition.
The components of net periodic benefit cost, other than the service cost component, are included in the line item "other" of noninterest expense in the Consolidated Statements of Income. The Corporation’s funding policy is to pay at least the minimum amount required by federal law and regulations, with consideration given to the maximum funding amounts allowed. The Corporation regularly reviews the funding of its pension plans. The Corporation made a $31 million contribution to the Bank Mutual Pension Plan during the second quarter of 2018.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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