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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Funded Status
The funded status of the Pension Plan was as follows:
 
At or For the Year Ended December 31,
(In thousands)
2018
 
2017
Change in projected benefit obligation:
 
 
 
Projected benefit obligation, beginning of period
$
31,389

 
$
33,174

Interest cost on projected benefit obligation
983

 
1,138

Actuarial (gain) loss
(630
)
 
765

Benefits paid
(3,412
)
 
(3,688
)
Projected benefit obligation, end of period
28,330

 
31,389

Change in fair value of plan assets:
 
 
 
Fair value of plan assets, beginning of period
36,863

 
39,377

Actual gain (loss) on plan assets
(607
)
 
1,174

Benefits paid
(3,412
)
 
(3,688
)
Fair value of plan assets, end of period
32,844

 
36,863

Funded status of plan, end of period
$
4,514

 
$
5,474

Amounts recognized in the Consolidated Statements of Financial Condition:
 
 
 
Prepaid (accrued) benefit cost, end of period
$
4,514

 
$
5,474

The funded status of the Postretirement Plan was as follows:
 
At or For the Year Ended December 31,
(In thousands)
2018
 
2017
Change in benefit obligation:
 
 
 
Benefit obligation, beginning of period
$
3,717

 
$
4,164

Interest cost on benefit obligation
110

 
133

Actuarial (gain) loss
(115
)
 
(248
)
Benefits paid
(392
)
 
(332
)
Benefit obligation, end of period
3,320

 
3,717

Change in fair value of plan assets:
 
 
 
Fair value of plan assets, beginning of period
—

 
—

Benefits paid
(392
)
 
(332
)
TCF contributions
392

 
332

Fair value of plan assets, end of period
—

 
—

Funded status of plan, end of period
$
(3,320
)
 
$
(3,717
)
Amounts recognized in the Consolidated Statements of Financial Condition:
 
 
 
Prepaid (accrued) benefit cost, end of period
$
(3,320
)
 
$
(3,717
)
Prior service cost included in accumulated other comprehensive income (loss)
(147
)
 
(193
)
Schedule of Pension Plan Investments Measured at Fair Value on a Recurring Basis
The Pension Plan's investments measured at fair value on a recurring basis were as follows:
 
At December 31, 2018
(In thousands)
Level 1
 
Level 2
 
Level 3
 
Total
Mutual funds
$
21,566

 
$
—

 
$
—

 
$
21,566

U.S. Treasury Bills
2,993

 
—

 
—

 
2,993

Interest-bearing cash
83

 
—

 
—

 
83

Mortgage-backed securities
—

 
3,399

 
—

 
3,399

Collective investment fund (measured at NAV of units as a practical expedient)
—

 
—

 
—

 
4,812

Total investments at fair value
$
24,642

 
$
3,399

 
$
—

 
$
32,853

 
 
 
 
 
 
 
 
 
At December 31, 2017
(In thousands)
Level 1
 
Level 2
 
Level 3
 
Total
Mutual funds
$
27,178

 
$
—

 
$
—

 
$
27,178

Interest-bearing cash
63

 
—

 
—

 
63

Mortgage-backed securities
—

 
4,613

 
—

 
4,613

Collective investment fund (measured at NAV of units as a practical expedient)
—

 
—

 
—

 
4,995

Total investments at fair value
$
27,241

 
$
4,613

 
$
—

 
$
36,849
Schedule of Net Periodic Benefit Plan (Income) Cost Included in Other Non-interest Expense
The net periodic benefit plan (income) cost included in other non-interest expense for the Pension Plan was as follows:
 
Year Ended December 31,
(In thousands)
2018
 
2017
 
2016
Interest cost
$
983

 
$
1,138

 
$
1,281

Return on plan assets
607

 
(1,174
)
 
(1,898
)
Recognized actuarial (gain) loss
(630
)
 
765

 
(625
)
Net periodic benefit plan (income) cost
$
960

 
$
729

 
$
(1,242
)
The net periodic benefit plan (income) cost included in other non-interest expense for the Postretirement Plan was as follows:
 
Year Ended December 31,
(In thousands)
2018
 
2017
 
2016
Interest cost
$
110

 
$
133

 
$
151

Recognized actuarial (gain) loss
(115
)
 
(248
)
 
(211
)
Amortization of prior service cost
(46
)
 
(46
)
 
(46
)
Net periodic benefit plan (income) cost
$
(51
)
 
$
(161
)
 
$
(106
)
Schedule of Assumptions Used to Determine the Estimated Benefit Obligation
The actuarial assumptions used in the Pension Plan valuation are reviewed annually. The assumptions used to determine the estimated net benefit plan cost for the Pension Plan were as follows:
 
Year Ended December 31,
 
2018
 
2017
 
2016
Discount rate
3.30
%
 
3.60
%
 
3.75
%
Expected long-term rate of return on plan assets
1.50

 
1.50

 
1.50

The assumptions used to determine the benefit obligation for the Postretirement Plan were as follows:
 
Year Ended December 31,
 
2018
 
2017
Discount rate
3.85
%
 
3.15
%
Health care cost trend rate assumed for next year
5.6

 
5.7

Final health care cost trend rate
4.5

 
4.5

Year that final health care trend rate is reached
2038

 
2038
Schedule of Expected Future Benefit Payments Used to Determine the Benefit Obligation
The expected future benefit payments used to determine the projected benefit obligation of the Pension Plan were as follows:
(In thousands)
 
2019
$
3,241

2020
2,793

2021
2,410

2022
2,298

2023
2,478

2024 - 2028
9,399

The expected future benefit payments used to determine the benefit obligation of the Postretirement Plan were as follows:
(In thousands)

2019
$
431

2020
402

2021
374

2022
347

2023
320

2024 - 2028
1,233
Schedule of Changes Recognized in Accumulated Other Comprehensive Income (Loss)
The changes recognized in accumulated other comprehensive income (loss) attributable to the Postretirement Plan were as follows:
 
At or For the Year Ended December 31,
(In thousands)
2018
 
2017
 
2016
Accumulated other comprehensive income (loss) before tax, beginning of period
$
(193
)
 
$
(239
)
 
$
(285
)
Amortization of prior service credit (recognized in net periodic benefit cost)
46

 
46

 
46

Accumulated other comprehensive income (loss) before tax, end of period
$
(147
)

$
(193
)

$
(239
)