RETIREMENT AND POSTRETIREMENT PLANS (Tables)

12 Months Ended

Dec. 31, 2022

Employee Retirement Plan

Defined Benefit Plan Disclosure [Line Items]

Schedule of funded status of defined benefit plan

	Year Ended December 31,
(In thousands)	2022		2021
Reconciliation of projected benefit obligation:
Projected benefit obligation at beginning of year	$	24,961	$	26,891
Interest cost		622		562
Actuarial (gain) loss		(5,004)		(903)
Benefit payments		(1,558)		(1,589)
Projected benefit obligation at end of year		19,021		24,961
Plan assets at fair value (investments in trust funds managed by trustee)
Balance at beginning of year		28,693		27,142
Return on plan assets		(4,542)		3,140
Benefit payments		(1,558)		(1,589)
Balance at end of year		22,593		28,693
Funded status at end of year	$	3,572	$	3,732

Components of net periodic benefit (credit) cost included in other non-interest expense

	Year Ended December 31,
(In thousands)	2022		2021		2020
Interest cost	$	622	$	562	$	732
Expected return on plan assets		(1,949)		(1,846)		(1,713)
Amortization of unrealized loss		261		824		914
Net periodic benefit (credit) cost	$	(1,066)	$	(460)	$	(67)

Schedule of change in accumulated other comprehensive loss

	Year Ended December 31,
(In thousands)	2022		2021
Balance at beginning of period	$	(4,097)	$	(7,119)
Amortization of unrealized loss		261		825
Gain (loss) recognized during the year		(1,487)		2,197
Balance at the end of the period	$	(5,323)	$	(4,097)
Period end component of accumulated other comprehensive loss, net of tax	$	3,649	$	2,808

Schedule of major assumptions utilized to determine the net periodic cost of the Employee Retirement Plan benefit obligations

	At or for the Year Ended December 31,
	2022		2021		2020
Discount rate used for net periodic benefit cost	2.55	%	2.15	%	2.97	%
Discount rate used to determine benefit obligation at period end	4.90		2.55		2.15
Expected long-term return on plan assets used for net periodic benefit cost	7.00		7.00		7.00
Expected long-term return on plan assets used to determine benefit obligation at period end	7.00		7.00		7.00

Summary of plan asset allocation by asset category

	December 31,
	2022		2021
Asset category
Equity securities	51	%	54	%
Debt securities (bond mutual funds)	47		42
Cash equivalents	2		4
Total	100	%	100	%

Summary of fair values of the plan assets

	December 31, 2022
	Fair Value Measurements Using:
	Quoted
	Prices in		Significant
	Active Markets for		Other		Significant
	Identical		Observable		Unobservable
(In thousands)	Assets (Level 1)		Inputs (Level 2)		Inputs (Level 3)		Total
Description:
Cash and cash equivalents	$	—	$	541	$	—	$	541
Equities:
U.S. large cap		8,398		—		—		8,398
U.S. mid cap/small cap		2,348		—		—		2,348
International		2,718		—		—		2,718
Equities blend		192		—		—		192
Fixed income securities:
Corporate		—		1,305		—		1,305
Government		2,527		—		—		2,527
Mortgage-backed		—		586		—		586
High yield bonds and bond funds		—		3,978		—		3,978
Total Plan Assets	$	16,183	$	6,410	$	—	$	22,593

	December 31, 2021
	Fair Value Measurements Using:
	Quoted
	Prices in		Significant
	Active Markets for		Other		Significant
	Identical		Observable		Unobservable
(In thousands)	Assets (Level 1)		Inputs (Level 2)		Inputs (Level 3)		Total
Description:
Cash and cash equivalents	$	—	$	1,001	$	—	$	1,001
Equities:
U.S. large cap		8,579		—		—		8,579
U.S. mid cap/small cap		2,896		—		—		2,896
International		3,560		—		—		3,560
Equities blend		479		—		—		479
Fixed income securities:
Corporate		—		1,288		—		1,288
Government		1,406		—		—		1,406
Mortgage-backed		—		1,858		—		1,858
High yield bonds and bond funds		—		7,626		—		7,626
Total Plan Assets	$	16,920	$	11,773	$	—	$	28,693

Schedule of expected benefit payments maturities

Year Ended December 31,	Amount
2023	$	1,526
2024		1,521
2025		1,498
2026		1,452
2027		1,403
2028 to 2032		6,674

BNB Bank Pension Plan

Defined Benefit Plan Disclosure [Line Items]

Schedule of funded status of defined benefit plan

	Year Ended December 31,
(In thousands)	2022		2021
Reconciliation of projected benefit obligation:
Projected benefit obligation at beginning of year	$	34,495	$	—
Acquired in the Merger		—		33,897
Service cost		807		893
Interest cost		793		609
Actuarial gain		(7,111)		(304)
Benefit payments		(1,064)		(600)
Projected benefit obligation at end of year		27,920		34,495
Plan assets at fair value (investments in trust funds managed by trustee)
Balance at beginning of year		47,857		—
Acquired in the Merger		—		43,685
Return on plan assets		(8,221)		4,772
Benefit payments		(1,064)		(600)
Balance at end of year		38,572		47,857
Funded status at end of year	$	10,652	$	13,362

Components of net periodic benefit (credit) cost included in other non-interest expense

	Year Ended December 31,
(In thousands)	2022		2021
Service cost	$	807	$	893
Interest cost		793		609
Expected return on plan assets		(3,441)		(2,883)
Net periodic benefit credit	$	(1,841)	$	(1,381)

Schedule of change in accumulated other comprehensive loss

	Year Ended December 31,
(In thousands)	2022		2021
Balance at beginning of period	$	2,193	$	—
Gain recognized during the year		(2,358)		2,193
Balance at the end of the period	$	(165)	$	2,193
Period end component of accumulated other comprehensive income, net of tax	$	113	$	(1,503)

Schedule of major assumptions utilized to determine the net periodic cost of the Employee Retirement Plan benefit obligations

	At or for the Year Ended December 31,
	2022		2021
Discount rate used for net periodic benefit cost	2.69	%	2.33	%
Discount rate used to determine benefit obligation at period end	4.98		2.69
Expected long-term return on plan assets used for net periodic benefit cost	7.25		7.25
Expected long-term return on plan assets used to determine benefit obligation at period end	7.25		7.25

Summary of plan asset allocation by asset category

	December 31,		December 31,
	2022		2021
Asset category
Equity securities	51	%	60	%
Debt securities (bond mutual funds)	46		37
Cash equivalents	3		3
Total	100	%	100	%

Summary of fair values of the plan assets

	December 31, 2022
	Fair Value Measurements Using:
	Quoted
	Prices in		Significant
	Active Markets for		Other		Significant
	Identical		Observable		Unobservable
(In thousands)	Assets (Level 1)		Inputs (Level 2)		Inputs (Level 3)		Total
Description:
Cash and cash equivalents	$	—	$	1,001	$	—	$	1,001
Equities:
U.S. large cap		14,310		—		—		14,310
U.S. mid cap/small cap		4,094		—		—		4,094
International		4,658		—		—		4,658
Equities blend		308		—		—		308
Fixed income securities:
Corporate		—		2,203		—		2,203
Government		4,275		—		—		4,275
Mortgage-backed		—		979		—		979
High yield bonds and bond funds		—		6,744		—		6,744
Total Plan Assets	$	27,645	$	10,927	$	—	$	38,572

	Fair Value Measurements
	at December 31, 2021
	Quoted
	Prices in		Significant
	Active Markets for		Other		Significant
	Identical		Observable		Unobservable
(In thousands)	Assets (Level 1)		Inputs (Level 2)		Inputs (Level 3)		Total
Description:
Cash and cash equivalents	$	—	$	1,581	$	—	$	1,581
Equities:
U.S. large cap		13,623		—		—		13,623
U.S. mid cap/small cap		5,669		—		—		5,669
International		8,332		—		—		8,332
Equities blend		900		—		—		900
Fixed income securities:
Corporate		—		1,696		—		1,696
Government		1,700		—		—		1,700
Mortgage-backed		—		2,549		—		2,549
High yield bonds and bond funds		—		11,807		—		11,807
Total Plan Assets		30,224	$	17,633	$	—	$	47,857

Schedule of expected benefit payments maturities

Year Ended December 31,	Amount
2023	$	1,337
2024		1,365
2025		1,456
2026		1,694
2027		1,688
2028 to 2032		10,505

BMP and Outside Director Retirement Plan

Defined Benefit Plan Disclosure [Line Items]

Schedule of funded status of defined benefit plan

	Year Ended December 31,
(In thousands)	2021		2020
Reconciliation of projected benefit obligation:
Projected benefit obligation at beginning of year	$	9,328	$	9,360
Interest cost		12		234
Benefit payments		(9,063)		(771)
Actuarial (gain) loss		(277)		505
Projected benefit obligation at end of year		—		9,328
Plan assets at fair value:
Balance at beginning of year		—		—
Contributions		9,063		771
Benefit payments		(9,063)		(771)
Balance at end of period		—		—
Funded status at end of year	$	—	$	(9,328)

Components of net periodic benefit (credit) cost included in other non-interest expense

	Year Ended December 31,
(In thousands)	2021		2020
Interest cost	$	12	$	234
Curtailment loss		1,543		—
Amortization of unrealized loss		—		179
Net periodic benefit cost	$	1,555	$	413

Schedule of change in accumulated other comprehensive loss

	Year Ended December 31,
(In thousands)	2021		2020
Balance at beginning of year	$	(1,820)	$	(1,494)
Amortization of unrealized loss		—		179
Gain (loss) recognized during the year		277		(505)
Curtailment credit		1,543		—
Balance at the end of year	$	—	$	(1,820)
Period end component of accumulated other comprehensive loss, net of tax	$	—	$	1,228

Schedule of major assumptions utilized to determine the net periodic cost of the Employee Retirement Plan benefit obligations

	At or For the Year Ended December 31,
	2020
Discount rate used for net periodic benefit cost – BMP	2.60	%
Discount rate used for net periodic benefit cost – Director Retirement Plan	2.68
Discount rate used to determine BMP benefit obligation at year end	1.55
Discount rate used to determine Director Retirement Plan benefit obligation at year end	1.69

POSTRETIREMENT PLANS

Defined Benefit Plan Disclosure [Line Items]

Schedule of funded status of defined benefit plan

	Year Ended December 31,
(In thousands)		2021		2020
Reconciliation of projected benefit obligation:
Projected benefit obligation at beginning of year	$	13	$	1,608
Interest cost		—		42
Actuarial loss		—		105
Curtailment gain		—		(1,577)
Benefit payments		(13)		(165)
Projected benefit obligation at end of year		—		13
Plan assets at fair value:
Balance at beginning of year		—		—
Contributions		13		165
Benefit payments		(13)		(165)
Balance at end of period		—		—
Funded status at end of year	$	—	$	(13)

Components of net periodic benefit (credit) cost included in other non-interest expense

	Year Ended December 31,
(In thousands)	2020
Interest cost	$	42
Curtailment gain		1,651
Amortization of unrealized loss		(9)
Net periodic benefit cost	$	1,684

Schedule of change in accumulated other comprehensive loss

		Year Ended December 31,
(In thousands)	2020
Balance at beginning of period	$	188
Amortization of unrealized loss		(9)
Recognition of prior service cost		(74)
Loss recognized during the year		(105)
Balance at the end of the period	$	—
Period end component of accumulated other comprehensive loss, net of tax	$	—

Schedule of major assumptions utilized to determine the net periodic cost of the Employee Retirement Plan benefit obligations

	At or For the Year Ended December 31,
	2020
Discount rate used for net periodic benefit cost	2.69	%
Discount rate used to determine benefit obligation at period end	0.29