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Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost Included in Non-interest Expense for the TCF Cash Balance Pension Plan and Postretirement Plan
The net periodic benefit plan (income) cost included in other noninterest expense for defined benefit pension plans and postretirement benefit plans were as follows:
 
Defined Benefit Pension Plans
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In thousands)
2020
 
2019
 
2020
 
2019
Interest cost
$
946

 
$
1,046

 
$
2,839

 
$
1,574

Return on plan assets
(864
)
 
(949
)
 
(2,594
)
 
(1,223
)
Net periodic benefit plan (income) cost
$
82

 
$
97

 
$
245

 
$
351

 
Postretirement Benefit Plans
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In thousands)
2020
 
2019
 
2020
 
2019
Interest cost
$
36

 
$
41

 
$
107

 
$
101

Service cost
—

 
—

 
1

 
—

Amortization of prior service cost
(12
)
 
(11
)
 
(35
)
 
(35
)
Net periodic benefit plan (income) cost
$
24

 
$
30

 
$
73

 
$
66