Employee Benefits - Asset Held In Rabbi Trust By Plan Type (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Unallocated Common Stock Held by ESOP | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	$ 27,015	$ 25,117
Unrealized Gain/(Loss)	5,027	4,367
Fair Value	32,042	29,484
Cash and cash equivalents | Unallocated Common Stock Held by ESOP | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	2,744	3,159
Fair Value	2,744	3,159
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value	91,700	78,700
Equity Securities | Unallocated Common Stock Held by ESOP | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	24,271	21,958
Unrealized Gain/(Loss)	5,027	4,367
Fair Value	29,298	26,325
Fixed income | Unallocated Common Stock Held by ESOP | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	0	0
Unrealized Gain/(Loss)	0	0
Fair Value	0	0
Supplemental Employee Retirement Plan | DB SERP | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	14,998	16,884
Unrealized Gain/(Loss)	5,812	5,732
Fair Value	20,810	22,616
Supplemental Employee Retirement Plan | DB SERP | Cash and cash equivalents | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	831	1,208
Fair Value	831	1,208
Supplemental Employee Retirement Plan | DB SERP | Equity Securities | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	9,993	10,822
Unrealized Gain/(Loss)	5,788	5,508
Fair Value	15,781	16,330
Supplemental Employee Retirement Plan | DB SERP | Fixed income | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	4,174	4,854
Unrealized Gain/(Loss)	24	224
Fair Value	4,198	5,078
Supplemental Employee Retirement Plan | DC SERP | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	25,066	21,206
Unrealized Gain/(Loss)	8,936	6,928
Fair Value	34,002	28,134
Supplemental Employee Retirement Plan | DC SERP | Cash and cash equivalents | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	229	240
Fair Value	229	240
Supplemental Employee Retirement Plan | DC SERP | Equity Securities | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	24,837	20,966
Unrealized Gain/(Loss)	8,936	6,928
Fair Value	33,773	27,894
Supplemental Employee Retirement Plan | DC SERP | Fixed income | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	0	0
Unrealized Gain/(Loss)	0	0
Fair Value	0	0
Pension Plan | BEP | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	9,767	5,389
Unrealized Gain/(Loss)	3,435	1,809
Fair Value	13,202	7,198
Pension Plan | BEP | Cash and cash equivalents | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	567	320
Fair Value	567	320
Pension Plan | BEP | Equity Securities | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	6,207	3,504
Unrealized Gain/(Loss)	3,412	1,730
Fair Value	9,619	5,234
Pension Plan | BEP | Fixed income | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	2,993	1,565
Unrealized Gain/(Loss)	23	79
Fair Value	3,016	1,644
Pension Plan | ODRCP | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	3,175	3,237
Unrealized Gain/(Loss)	1,141	1,014
Fair Value	4,316	4,251
Pension Plan | ODRCP | Cash and cash equivalents | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	123	230
Fair Value	123	230
Pension Plan | ODRCP | Equity Securities | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	2,093	1,985
Unrealized Gain/(Loss)	1,132	959
Fair Value	3,225	2,944
Pension Plan | ODRCP | Fixed income | Primary Beneficiary
Defined Benefit Plan Disclosure [Line Items]
Book Value	959	1,022
Unrealized Gain/(Loss)	9	55
Fair Value	$ 968	$ 1,077