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Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Projected Benefit Obligations, Fair Value of Plan Assets and Funded (Unfunded) Status
The following table presents the plans’ projected benefit obligations, fair value of plan assets and funded (unfunded) status:
(Dollars in thousands)Qualified
Pension Plan		Non-Qualified
Retirement Plans
At December 31, 2020201920202019
Change in Benefit Obligation:
Benefit obligation at beginning of period
$83,141 $73,380 $16,438 $14,626 
Service cost
2,164 2,037 170 126 
Interest cost
2,505 2,967 465 563 
Actuarial loss10,378 10,453 1,803 2,028 
Benefits paid
(3,334)(5,546)(903)(905)
Administrative expenses
(112)(150)— — 
Benefit obligation at end of period
94,742 83,141 17,973 16,438 
Change in Plan Assets:
Fair value of plan assets at beginning of period
93,749 86,180 — — 
Actual return on plan assets
11,626 13,265 — — 
Employer contributions
— — 903 905 
Benefits paid
(3,334)(5,546)(903)(905)
Administrative expenses
(112)(150)— — 
Fair value of plan assets at end of period
101,929 93,749 — — 
Funded (unfunded) status at end of period$7,187 $10,608 ($17,973)($16,438)
Schedule of Components of Accumulated Other Comprehensive Income (Loss) Related to Retirements Plans
The following table presents the amounts included in accumulated other comprehensive income (“AOCI”) related to the qualified pension plan and non-qualified retirement plans:
(Dollars in thousands)Qualified
Pension Plan		Non-Qualified
Retirement Plans
At December 31, 2020201920202019
Net actuarial loss included in AOCI, pre-tax$12,051 $10,343 $8,648 $7,405 
Schedule of Net Periodic Benefit Costs and Other Amounts Recognized in Other Comprehensive Income (Loss)
The following table presents components of net periodic benefit cost and other amounts recognized in other comprehensive income (loss), on a pre-tax basis:
(Dollars in thousands)Qualified
Pension Plan		Non-Qualified
Retirement Plans
Years ended December 31, 202020192018202020192018
Net Periodic Benefit Cost:
Service cost (1)
$2,164 $2,037 $2,244 $170 $126 $108 
Interest cost (2)
2,505 2,967 2,715 465 563 475 
Expected return on plan assets (2)
(4,538)(4,495)(5,272)— — — 
Amortization of prior service credit (2)
— (16)(23)— — (1)
Recognized net actuarial loss (2)
1,582 792 1,496 560 408 411 
Net periodic benefit cost
1,713 1,285 1,160 1,195 1,097 993 
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (on a pre-tax basis):
Net loss (gain)
1,708 890 (4,342)1,244 1,620 (663)
Prior service credit
— 16 23 — — 1 
Recognized in other comprehensive income (loss)
1,708 906 (4,319)1,244 1,620 (662)
Total recognized in net periodic benefit cost and other comprehensive income (loss)
$3,421 $2,191 ($3,159)$2,439 $2,717 $331 
(1)Included in salaries and employee benefits expense in the Consolidated Statements of Income.
(2)Included in other expenses in the Consolidated Statements of Income.
Schedule of Assumptions Used for Net Periodic Benefit Cost
The following table presents the measurement date and weighted-average assumptions used to determine benefit obligations at December 31, 2020 and 2019:
Qualified
Pension Plan		Non-Qualified Retirement Plans
2020201920202019
Measurement dateDec 31, 2020Dec 31, 2019Dec 31, 2020Dec 31, 2019
Discount rate2.71 %3.42 %2.50 %3.30 %
Rate of compensation increase3.75 3.75 3.75 3.75 

The following table presents the measurement date and weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31, 2020, 2019 and 2018:
Qualified Pension PlanNon-Qualified Retirement Plans
202020192018202020192018
Measurement dateDec 31, 2019Dec 31, 2018Dec 31, 2017Dec 31, 2019Dec 31, 2018Dec 31, 2017
Equivalent single discount rate for benefit obligations
3.42 %4.38 %3.69 %3.30 %4.28 %3.58 %
Equivalent single discount rate for service cost
3.54 4.44 3.76 3.62 4.48 3.79 
Equivalent single discount rate for interest cost
3.07 4.12 3.42 2.93 3.98 3.22 
Expected long-term return on plan assets
5.75 5.75 6.75 N/AN/AN/A
Rate of compensation increase
3.75 3.75 3.75 3.75 3.75 3.75 
Schedule of Fair Value and Allocation of Plan Assets
The following tables present the fair values of the qualified pension plan’s assets:
(Dollars in thousands)
Fair Value Measurements UsingAssets at
Fair Value
December 31, 2020Level 1Level 2Level 3
Assets:
Cash and cash equivalents$14,427 $— $— $14,427 
Obligations of U.S. government-sponsored enterprises— 29,449 — 29,449 
Obligations of states and political subdivisions— 2,327 — 2,327 
Corporate bonds— 9,211 — 9,211 
Common stocks17,150 — — 17,150 
Mutual funds29,365 — — 29,365 
Total plan assets$60,942 $40,987 $— $101,929 

(Dollars in thousands)
Fair Value Measurements UsingAssets at
Fair Value
December 31, 2019Level 1Level 2Level 3
Assets:
Cash and cash equivalents$9,902 $— $— $9,902 
Obligations of U.S. government-sponsored enterprises
— 28,615 — 28,615 
Obligations of states and political subdivisions— 2,998 — 2,998 
Corporate bonds— 10,033 — 10,033 
Common stocks14,593 — — 14,593 
Mutual funds27,608 — — 27,608 
Total plan assets$52,103 $41,646 $— $93,749 
The following table presents the asset allocations of the qualified pension plan, by asset category:
December 31,20202019
Asset Category:
Cash and cash equivalents14.2 %10.6 %
Fixed income securities (1)
40.2 44.4 
Equity securities (2)
45.6 45.0 
Total100.0 %100.0 %
(1)Includes obligations of U.S. government agencies and U.S. government-sponsored enterprises, obligations of states and political subdivisions and corporate bonds.
(2)Includes common stocks and mutual funds.
Schedule of Expected Future Benefit Payments
The following table presents the benefit payments, which reflect expected future service, as appropriate, expected to be paid:
(Dollars in thousands)Qualified
Pension Plan		Non-Qualified
Retirement Plans
Years ending December 31,2021$5,608 $896 
20224,255 886 
20234,804 881 
20244,830 874 
20256,096 871 
2026 and thereafter27,942 4,460