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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
Summary of 401(k) Contribution Plan The Company recorded salaries & benefits expense attributable to the 401(k) Plan matching contributions and 401(k) Plan matching contributions for the years ended:
 Year Ended December 31,
(in thousands)201920182017
401(k) Plan benefits expense$1,119  $879  $776  
401(k) Plan contributions made by the Company$1,003  $872  $767  
Summary of ESOP Activities Expenses related to the Company’s ESOP, included in benefits and other compensation costs under salaries and benefits expense, and contributions to the plan for the years ended were:
 Year Ended December 31,
(in thousands)201920182017
ESOP benefits expense$2,500  $1,887  $2,149  
ESOP contributions made by the Company$1,875  $1,952  $2,073  
Schedule of Deferred Compensation Earnings Credits Included in Noninterest Expense Earnings credits on deferred balances included in non-interest expense are included in the following table:
 Year Ended December 31,
(in thousands)201920182017
Deferred compensation earnings credits included in non-interest expense$363  $462  $478  
Defined Benefit Pension Plans Amounts recognized as a component of accumulated other comprehensive loss as of year-end that have not been recognized as a component of the combined net period benefit cost of the Company’s defined benefit pension plans are presented in the following table. The Company expects to recognize approximately $2,984,000 of the net actuarial loss reported in the following table as of December 31, 2019 as a component of net periodic benefit cost during 2020.
 December 31,
(in thousands)20192018
Transition obligation$1  $3  
Prior service cost(141) (194) 
Net actuarial loss11,333  4,993  
Amount included in accumulated other comprehensive loss11,193  4,802  
Deferred tax benefit(3,309) (1,420) 
Amount included in accumulated other comprehensive loss, net of tax$7,884  $3,382  
Information Pertaining to Activity in Supplemental Retirement Plans
Information pertaining to the activity in the supplemental retirement plans, using a measurement date of December 31, is as follows:
 December 31,
(in thousands)20192018
Change in benefit obligation:
Benefit obligation at beginning of year$(29,196) $(28,472) 
Service cost(879) (973) 
Interest cost(1,131) (949) 
Actuarial (loss)/gain(6,747) 92  
Plan amendments—  —  
Benefits paid1,216  1,106  
Benefit obligation at end of year$(36,737) $(29,196) 
Change in plan assets:
Fair value of plan assets at beginning of year$—  $—  
Fair value of plan assets at end of year$—  $—  
Funded status$(36,737) $(29,196) 
Unrecognized net obligation existing at January 1, 19861  3  
Unrecognized net actuarial loss11,333  4,993  
Unrecognized prior service cost(141) (194) 
Accumulated other comprehensive income(11,193) (4,802) 
Accrued benefit cost$(36,737) $(29,196) 
Accumulated benefit obligation$(35,981) $(27,544) 
Net Periodic Benefit Cost Recognized for Supplemental Retirement Plans
The following table sets forth the net periodic benefit cost recognized for the supplemental retirement plans:
 Year Ended December 31,
(in thousands)201920182017
Net pension cost included the following components:
Service cost-benefits earned during the period$879  $973  $941  
Interest cost on projected benefit obligation1,131  949  991  
Amortization of net obligation at transition2  2  2  
Amortization of prior service cost(54) (54) (12) 
Recognized net actuarial loss408  510  390  
Net periodic pension cost$2,366  $2,380  $2,312  
Assumptions Used in Accounting for Plans The following table sets forth assumptions used in accounting for the plans:
 Year Ended December 31,
 201920182017
Discount rate used to calculate benefit obligation2.82 %3.96 %3.40 %
Discount rate used to calculate net periodic pension cost3.96 %3.40 %3.80 %
Average annual increase in executive compensation3.25 %3.25 %3.25 %
Average annual increase in director compensation— %— %— %
Expected Benefit Payments to Participants and Estimated Contributions to be Made by Company
The following table sets forth the expected benefit payments to participants and estimated contributions to be made by the Company under the supplemental retirement plans for the years indicated:
Expected Benefit
Payments to
Participants		Estimated
Company
Contributions
(in thousands)
2020$1,555  $1,555  
20212,128  2,128  
20222,179  2,179  
20232,179  2,179  
20242,191  2,193  
2025-202910,956  10,956