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BENEFIT PLANS - Funded Status and Amounts Recognized in Balance Sheets and AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2009
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of year | $ 1,400 |  |  |
Fair value of plan assets at end of year |  | $ 1,400 |  |
Amounts recognized in the consolidated statement of condition were: |  |  |  |
AOCI at year end | 15,470 | 28,873 | $ 34,882 |
Accumulated other comprehensive income (loss), negative postretirement medical plan amendment, arising during period, net of tax |  |  |  | $ 3,500
Additional unamortized actuarial gain | 1,100 |  |  |
Pension Benefits [Member] |  |  |  |
Change in benefit obligation: |  |  |  |
Benefit obligation at the beginning of year | 190,361 | 162,084 |  |
Service cost | 5,920 | 5,750 | 5,081 |
Interest cost | 5,036 | 5,657 | 6,264 |
Plan amendment / acquisition | 0 | 13,598 |  |
Participant contributions | 0 | 0 |  |
Deferred actuarial (gain)/loss | (4,881) | 13,954 |  |
Benefits paid | (13,166) | (10,682) |  |
Benefit obligation at end of year | 183,270 | 190,361 | 162,084 |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of year | 272,600 | 227,323 |  |
Actual return of plan assets | 27,614 | 33,543 |  |
Participant contributions | 0 | 0 |  |
Employer contributions | 3,639 | 7,993 |  |
Plan acquisition | 0 | 14,423 |  |
Benefits paid | (13,166) | (10,682) |  |
Fair value of plan assets at end of year | 290,687 | 272,600 | 227,323 |
Over/(Under) funded status at year end | 107,417 | 82,239 |  |
Amounts recognized in the consolidated statement of condition were: |  |  |  |
Other assets | 127,538 | 101,849 |  |
Other liabilities | (20,121) | (19,610) |  |
Amounts recognized in the consolidated statement of condition were: |  |  |  |
Net loss | 16,977 | 34,290 |  |
Net prior service cost (credit) | 3,969 | 4,348 |  |
Pre-tax AOCI | 20,946 | 38,638 |  |
Taxes | (5,236) | (9,488) |  |
AOCI at year end | 15,710 | 29,150 |  |
Pension Benefits [Member] | Unfunded Plan Member |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at end of year | 3,500 |  |  |
Pension Benefits [Member] | Nonqualified Plan [Member] | Unfunded Plan Member |  |  |  |
Change in plan assets: |  |  |  |
Employer contributions | 2,900 | 3,900 |  |
Pension Benefits [Member] | Restoration Plan [Member] | Nonqualified Plan [Member] | Unfunded Plan Member |  |  |  |
Amounts recognized in the consolidated statement of condition were: |  |  |  |
Initial projected benefit obligation | 30 | 30 |  |
Post-retirement Benefits [Member] |  |  |  |
Change in benefit obligation: |  |  |  |
Benefit obligation at the beginning of year | 1,718 | 1,677 |  |
Service cost | 0 | 0 | 0 |
Interest cost | 44 | 57 | 70 |
Plan amendment / acquisition | 0 | 0 |  |
Participant contributions | 0 | 0 |  |
Deferred actuarial (gain)/loss | (85) | 114 |  |
Benefits paid | (148) | (130) |  |
Benefit obligation at end of year | 1,529 | 1,718 | 1,677 |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |  |
Actual return of plan assets | 0 | 0 |  |
Participant contributions | 0 | 0 |  |
Employer contributions | 148 | 130 |  |
Plan acquisition | 0 | 0 |  |
Benefits paid | (148) | (130) |  |
Fair value of plan assets at end of year | 0 | 0 | $ 0 |
Over/(Under) funded status at year end | (1,529) | (1,718) |  |
Amounts recognized in the consolidated statement of condition were: |  |  |  |
Other assets | 0 | 0 |  |
Other liabilities | (1,529) | (1,718) |  |
Amounts recognized in the consolidated statement of condition were: |  |  |  |
Net loss | 585 | 715 |  |
Net prior service cost (credit) | (907) | (1,086) |  |
Pre-tax AOCI | (322) | (371) |  |
Taxes | 82 | 94 |  |
AOCI at year end | $ (240) | (277) |  |
Supplemental Pension Plans [Member] | Key Executives [Member] |  |  |  |
Pension Plan [Abstract] |  |  |  |
Defined Benefit Plan, Funding Status [Extensible List] | Unfunded Plan Member |  |  |
Change in benefit obligation: |  |  |  |
Benefit obligation at the beginning of year | $ 19,600 |  |  |
Benefit obligation at end of year | 19,800 | 19,600 |  |
Amounts recognized in the consolidated statement of condition were: |  |  |  |
Benefit obligation for defined benefit pension plan prior to plan revaluation | $ 163,100 | $ 170,800 |  |

X
- Definition The tax on net gain (loss) on prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References No definition available. + Details
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- Definition The benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to plan revaluation. + References No definition available. + Details
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- Definition The cost (credit) resulting from a plan amendment that occurred during the period, after tax. The cost has not been recognized in net periodic benefit cost. A plan amendment includes provisions that grant increased benefits based on service rendered in prior periods. + References No definition available. + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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