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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Defined Benefit Plan [Abstract]  
Net period benefit cost for the pension and postretirement plans
The components of net periodic pension cost and net periodic benefit cost for the RAP, Bank Mutual Pension Plan, and Postretirement Plan for the three and six months ended June 30, 2019 and 2018 were as follows:
 
Three Months Ended June 30,
Six Months Ended June 30,
 
2019
 
2018
2019
 
2018
 
($ in Thousands)
Components of Net Periodic Benefit Cost
 
 
 
 
 
 
RAP
 
 
 
 
 
 
Service cost
$
1,925

 
$
1,893

$
3,850

 
$
3,785

Interest cost
2,413

 
1,660

4,825

 
3,320

Expected return on plan assets
(6,075
)
 
(4,755
)
(12,150
)
 
(9,510
)
Amortization of prior service cost
(19
)
 
(19
)
(38
)
 
(38
)
Amortization of actuarial loss
65

 
463

130

 
925

Total net periodic pension cost
$
(1,691
)
 
$
(759
)
$
(3,383
)
 
$
(1,518
)
Bank Mutual Pension Plan
 
 
 
 
 
 
Interest cost
N/A

 
650

N/A

 
$
1,083

Expected return on plan assets
N/A

 
(1,060
)
N/A

 
(1,592
)
Total net periodic pension cost
N/A

 
$
(410
)
N/A

 
$
(509
)
Postretirement Plan
 
 
 
 
 
 
Interest cost
$
26

 
$
27

$
52

 
$
53

Amortization of prior service cost
(19
)
 
(19
)
(38
)
 
(38
)
Amortization of actuarial loss
(1
)
 
2

(2
)
 
4

Total net periodic benefit cost
$
6

 
$
10

$
13

 
$
19