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Retirement Plans (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2019 and 2018 were as follows:
 
Three Months Ended September 30,
Nine Months Ended September 30,
($ in Thousands)
2019
 
2018
2019
 
2018
Components of Net Periodic Benefit Cost
 
 
 
 
 
 
RAP
 
 
 
 
 
 
Service cost
$
1,598

 
$
1,885

$
5,448

 
$
5,670

Interest cost
2,489

 
1,682

7,314

 
5,002

Expected return on plan assets
(6,099
)
 
(4,777
)
(18,249
)
 
(14,287
)
Amortization of prior service cost
(18
)
 
(18
)
(55
)
 
(56
)
Amortization of actuarial loss
230

 
549

360

 
1,474

Total net periodic pension cost
$
(1,800
)
 
$
(680
)
$
(5,183
)
 
$
(2,197
)
Bank Mutual Pension Plan
 
 
 
 
 
 
Interest cost
N/A

 
$
654

N/A

 
$
1,737

Expected return on plan assets
N/A

 
(1,220
)
N/A

 
(2,812
)
Total net periodic pension cost
N/A

 
$
(566
)
N/A

 
$
(1,075
)
Postretirement Plan
 
 
 
 
 
 
Interest cost
$
26

 
$
27

$
78

 
$
80

Amortization of prior service cost
(19
)
 
(19
)
(56
)
 
(56
)
Amortization of actuarial loss
(1
)
 
2

(3
)
 
6

Total net periodic benefit cost
$
6

 
$
11

$
19

 
$
30