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Retirement Plans, Pension and Postretirement Plans Table (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]        
Fair Value Of Plan Assets As A Percentage Of Net Benefit Obligation   167.00% 178.00%  
Change in Fair Value of Plan Assets        
Fair value of plan assets at beginning of year   $ 331,610    
Fair value of plan assets at end of year (a)   390,564 $ 331,610  
Retirement Account Plan        
Change in Fair Value of Plan Assets        
Fair value of plan assets at beginning of year   331,609 295,718  
Actual return on plan assets     41,490  
Employer contributions     6,242  
Gross benefits paid     (11,841)  
Bank Mutual plan assets transferred at December 31, 2018   79,805    
Fair value of plan assets at end of year (a)   390,564 331,609 $ 295,718
Change in Benefit Obligation        
Net benefit obligation at beginning of year   186,423 176,825  
Service cost   7,540 6,955 6,780
Interest cost   9,125 7,121 7,121
Actuarial (gain) loss     7,363  
Gross benefits paid     (11,841)  
Lump sums paid     0  
Bank Mutual benefit obligations transferred at December 31, 2018   51,549    
Net benefit obligation at end of year (a)   233,658 186,423 176,825
Funded (unfunded) status   156,906 145,186  
Noncurrent assets   156,906 145,186  
Current liabilities   0 0  
Noncurrent liabilities   0 0  
Asset (Liability) Recognized in the Consolidated Balance Sheets   156,906 145,186  
Other Pension Plan [Member]        
Change in Fair Value of Plan Assets        
Fair value of Bank Mutual plan assets at February 1, 2018 $ 59,445      
Actual return on plan assets   (1,665)    
Employer contributions   37,537    
Gross benefits paid   (15,513)    
Bank Mutual plan assets transferred at December 31, 2018   (79,805)    
Fair value of plan assets at end of year (a)   0    
Change in Benefit Obligation        
Net Bank Mutual benefit obligation at February 1, 2018 66,364      
Service cost   0    
Interest cost   2,398    
Actuarial (gain) loss   (1,701)    
Gross benefits paid   (2,644)    
Lump sums paid   (12,868)    
Bank Mutual benefit obligations transferred at December 31, 2018   (51,549)    
Net benefit obligation at end of year (a)   0    
Funded (unfunded) status   0    
Noncurrent assets   0    
Current liabilities   0    
Noncurrent liabilities   0    
Asset (Liability) Recognized in the Consolidated Balance Sheets   0    
Postretirement Plan        
Change in Fair Value of Plan Assets        
Fair value of plan assets at beginning of year   0 0  
Fair value of Bank Mutual plan assets at February 1, 2018 0      
Actual return on plan assets   0 0  
Employer contributions   292 235  
Gross benefits paid   (292) (235)  
Bank Mutual plan assets transferred at December 31, 2018   0    
Fair value of plan assets at end of year (a)   0 0 0
Change in Benefit Obligation        
Net benefit obligation at beginning of year   2,478 2,403  
Net Bank Mutual benefit obligation at February 1, 2018 $ 576      
Service cost   0 0  
Interest cost   108 101 142
Actuarial (gain) loss   (347) 209  
Gross benefits paid   (292) (235)  
Lump sums paid   0 0  
Bank Mutual benefit obligations transferred at December 31, 2018   0    
Net benefit obligation at end of year (a)   2,523 2,478 $ 2,403
Funded (unfunded) status   (2,523) (2,478)  
Noncurrent assets   0 0  
Current liabilities   (219) (233)  
Noncurrent liabilities   (2,304) (2,245)  
Asset (Liability) Recognized in the Consolidated Balance Sheets   (2,523) (2,478)  
Retirement Account Plan Prior to Merger [Member]        
Change in Fair Value of Plan Assets        
Fair value of plan assets at beginning of year   331,609    
Actual return on plan assets   (14,609)    
Employer contributions   4,340    
Gross benefits paid   (10,582)    
Fair value of plan assets at end of year (a)     331,609  
Change in Benefit Obligation        
Net benefit obligation at beginning of year   186,423    
Service cost   7,540    
Interest cost   6,727    
Actuarial (gain) loss   (8,000)    
Gross benefits paid   (10,582)    
Lump sums paid   $ 0    
Net benefit obligation at end of year (a)     $ 186,423