HarborOne Bancorp (HONE) 10-Q 7 May 24 2024 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2024	May 01, 2024
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2024
Entity File Number	001-38955
Entity Registrant Name	HarborOne Bancorp, Inc.
Entity Incorporation, State or Country Code	MA
Entity Tax Identification Number	81-1607465
Entity Address, Address Line One	770 Oak Street
Entity Address, City or Town	Brockton
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02301
City Area Code	508
Local Phone Number	895-1000
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	HONE
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		44,675,732
Entity Central Index Key	0001769617
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets
Cash and due from banks	$ 36,340	$ 38,876
Short-term investments	357,101	188,474
Total cash and cash equivalents	393,441	227,350
Securities available for sale, at fair value	291,008	290,151
Securities held to maturity, at amortized cost (fair value of $19,102 at March 31, 2024 and $19,262 at December 31. 2023)	19,724	19,796
Federal Home Loan Bank stock, at cost	26,565	27,098
Asset held for sale	348	348
Loans held for sale, at fair value	16,434	19,686
Loans	4,776,685	4,750,311
Less: Allowance for credit losses on loans	(48,185)	(47,972)
Net loans	4,728,500	4,702,339
Accrued interest receivable	19,470	18,169
Mortgage servicing rights, at fair value	46,597	46,111
Property and equipment, net	47,913	48,749
Retirement plan annuities	15,315	15,170
Bank-owned life insurance	95,421	94,675
Goodwill	59,042	59,042
Intangible assets	1,326	1,515
Other assets	101,118	97,697
Total assets	5,862,222	5,667,896
Deposits:
Demand deposit accounts	677,152	659,973
NOW accounts	305,071	305,825
Regular savings and club accounts	1,110,404	1,265,315
Money market deposit accounts	1,061,145	966,201
Term certificate accounts	852,326	863,457
Brokered deposits	387,926	326,638
Total deposits	4,394,024	4,387,409
Borrowings	754,380	568,462
Mortgagors' escrow accounts	10,364	8,872
Accrued interest payable	7,302	5,251
Other liabilities and accrued expenses	118,469	114,143
Total liabilities	5,284,539	5,084,137
Commitments and contingencies (Notes 7, 12 and 13)
Common stock, $0.01 par value; 150,000,000 shares authorized; 60,512,221 and 60,255,288 shares issued; 45,055,006 and 45,401,224 shares outstanding at March 31, 2024 and December 31, 2023, respectively	598	598
Additional paid-in capital	487,277	486,502
Retained earnings	363,591	359,656
Treasury stock, at cost, 15,457,215 and 14,854,064 shares at March 31, 2024 and December 31, 2023, respectively	(199,853)	(193,590)
Accumulated other comprehensive loss	(48,604)	(43,622)
Unearned compensation - ESOP	(25,326)	(25,785)
Total stockholders' equity	577,683	583,759
Total liabilities and stockholders' equity	$ 5,862,222	$ 5,667,896

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Consolidated Balance Sheets (unaudited)
Held-to-maturity securities, fair value	$ 19,102	$ 19,262
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	60,512,221	60,255,288
Common stock, shares outstanding	45,055,006	45,401,224
Treasury, shares	15,457,215	14,854,064

Consolidated Statements of Inco

Consolidated Statements of Income (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest and dividend income:
Interest and fees on loans	$ 59,937	$ 52,771
Interest on loans held for sale	243	286
Interest on taxable securities	2,065	2,079
Other interest and dividend income	4,659	803
Total interest and dividend income	66,904	55,939
Interest expense:
Interest on deposits	26,899	15,913
Interest on borrowings	9,423	5,105
Interest on subordinated debentures		523
Total interest expense	36,322	21,541
Net interest and dividend income	30,582	34,398
Provision (benefit) for credit losses	(168)	1,866
Net interest and dividend income, after provision for credit losses	30,750	32,532
Mortgage banking income:
Gain on sale of mortgage loans	2,013	2,224
Changes in mortgage servicing rights fair value	54	(1,692)
Other	2,276	2,216
Total mortgage banking income	4,343	2,748
Deposit account fees	4,983	4,733
Income on retirement plan annuities	145	119
Bank-owned life insurance income	746	500
Other income	524	590
Total noninterest income	10,741	8,690
Noninterest expense:
Compensation and benefits	17,636	17,799
Occupancy and equipment	4,781	5,040
Data processing	2,479	2,346
Loan expenses	371	313
Marketing	816	1,181
Deposit expenses	690	534
Postage and printing	438	457
Professional fees	1,457	1,501
Foreclosed and repossessed assets	4	(17)
Deposit insurance	1,164	510
Other expenses	1,914	1,845
Total noninterest expense	31,750	31,509
Income before income taxes	9,741	9,713
Income tax provision	2,441	2,416
Net income	$ 7,300	$ 7,297
Earnings per common share:
Basic	$ 0.17	$ 0.16
Diluted	$ 0.17	$ 0.16
Weighted average shares outstanding:
Weighted average common shares, basic	41,912,421	44,857,224
Weighted average common shares, diluted	42,127,037	45,284,240

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss) Income (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Consolidated Statements of Comprehensive (Loss) Income (unaudited)
Net income	$ 7,300	$ 7,297
Unrealized gain/loss on cashflow hedge:
Unrealized holding gains(losses)	718	(170)
Reclassification adjustment for net gains included in net income	(1,235)	(1,018)
Net change in unrealized losses on derivatives in cashflow hedging instruments	(517)	(1,188)
Related tax effect	148	334
Net-of-tax amount	(369)	(854)
Unrealized gain/loss on securities available for sale:
Unrealized holding (losses) gains	(4,940)	7,089
Related tax effect	348	(1,563)
Net-of-tax amount	(4,592)	5,526
Postretirement benefit:
Adjustment of accumulated obligation for postretirement benefits	(1)
Reclassification adjustment for gains recognized in net periodic benefit cost	(20)
Net gains	(21)
Net-of-tax amount	(21)
Total other comprehensive (loss) income	(4,982)	4,672
Comprehensive income	$ 2,318	$ 11,969

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock, at Cost	Accumulated Other Comprehensive Income (Loss)	Unearned Compensation - ESOP	Total
Balance at beginning of period at Dec. 31, 2022	$ 596	$ 483,031	$ 356,438	$ (148,384)	$ (47,082)	$ (27,623)	$ 616,976
Balance, beginning of period (in shares) at Dec. 31, 2022	48,961,452
Comprehensive income (loss)			7,297		4,672		11,969
Dividends declared per share			(3,281)				(3,281)
ESOP shares committed to be released		312				459	771
Restricted stock awards granted, net of forfeitures (in shares)	157,059
Share-based compensation expense	$ 1	488					489
Treasury stock purchased				(27,130)			(27,130)
Treasury stock purchased (in shares)	(2,055,424)
Balance at end of period at Mar. 31, 2023	$ 597	483,831	360,454	(175,514)	(42,410)	(27,164)	599,794
Balance, end of period (in shares) at Mar. 31, 2023	47,063,087
Balance at beginning of period at Dec. 31, 2023	$ 598	486,502	359,656	(193,590)	(43,622)	(25,785)	$ 583,759
Balance, beginning of period (in shares) at Dec. 31, 2023	45,401,224						45,401,224
Comprehensive income (loss)			7,300		(4,982)		$ 2,318
Dividends declared per share			(3,365)				(3,365)
ESOP shares committed to be released		162				459	621
Restricted stock awards granted, net of forfeitures (in shares)	193,073
Performance stock units vested (in shares)	63,860
Share-based compensation expense		613					613
Treasury stock purchased				(6,263)			(6,263)
Treasury stock purchased (in shares)	(603,151)
Balance at end of period at Mar. 31, 2024	$ 598	$ 487,277	$ 363,591	$ (199,853)	$ (48,604)	$ (25,326)	$ 577,683
Balance, end of period (in shares) at Mar. 31, 2024	45,055,006						45,055,006

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Consolidated Statements of Changes in Stockholders' Equity (unaudited)
Dividends declared per share	$ 0.08	$ 0.075
ESOP shares committed to be released (in shares)	57,681	57,681

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net income	$ 7,300,000	$ 7,297,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision (benefit) for credit losses	(168,000)	1,866,000
Net amortization of securities premiums/discounts	88,000	106,000
Proceeds from sale of loans	92,798,000	81,760,000
Loans originated for sale	(87,755,000)	(74,940,000)
Accretion of net deferred loan costs/fees and premiums	(56,000)	(88,000)
Depreciation and amortization of premises and equipment	946,000	973,000
Change in mortgage servicing rights fair value	(275,000)	1,692,000
Mortgage servicing rights capitalized	(211,000)	(634,000)
Accretion of fair value adjustment on loans and deposits, net	(92,000)	(39,000)
Amortization of other intangible assets	189,000	190,000
Amortization of subordinated debt issuance costs		32,000
Net gains on mortgage loan sales, including fair value adjustments	(1,790,000)	(2,232,000)
Bank-owned life insurance income	(746,000)	(500,000)
Income on retirement plan annuities	(145,000)	(119,000)
Net loss (gain) on sale and write-down of other real estate owned and repossessed assets	4,000	(17,000)
ESOP expense	621,000	771,000
Share-based compensation expense	613,000	489,000
Net change in:
Decrease in operating lease ROU assets	462,000	728,000
Decrease in operating lease liabilities	(443,000)	(727,000)
Change in other assets	(3,803,000)	4,139,000
Change in other liabilities	7,437,000	(11,082,000)
Net cash provided by operating activities	14,974,000	9,665,000
Activity in securities available for sale:
Maturities, prepayments and calls	4,801,000	5,073,000
Purchases	(10,689,000)
Activity in securities held to maturity:
Maturities, prepayment and calls	74,000	113,000
Net redemption (purchase) of FHLB stock	533,000	(3,518,000)
Participation-in loan purchases		(7,342,000)
Net loan (originations) payments	(27,822,000)	(65,510,000)
Proceeds from sale of other real estate owned and repossessed assets	65,000	105,000
Additions to property and equipment	(110,000)	(491,000)
Net cash used by investing activities	(33,148,000)	(71,570,000)
Cash flows from financing activities:
Net increase in deposits	6,615,000	52,178,000
Net change in short-term borrowed funds	(68,000,000)	40,000,000
Proceeds from borrowings	317,326,000	150,000,000
Repayment of borrowings	(63,408,000)	(10,000)
Net change in mortgagors' escrow accounts	1,492,000	2,048,000
Treasury stock purchased	(6,263,000)	(27,130,000)
Dividends paid	(3,497,000)	(3,444,000)
Net cash provided by financing activities	184,265,000	213,642,000
Net change in cash and cash equivalents	166,091,000	151,737,000
Cash and cash equivalents at beginning of period	227,350,000	98,017,000
Cash and cash equivalents at end of period	393,441,000	249,754,000
Supplemental cash flow information:
Interest paid on deposits	26,781,000	15,343,000
Interest paid on borrowed funds	7,501,000	6,077,000
Income taxes paid, net	2,103,000	1,131,000
Transfer of loans to other real estate owned and repossessed assets	41,000	80,000
Dividends declared	$ 3,365,000	$ 3,281,000

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2024
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES ​ Basis of Presentation and Consolidation ​ The unaudited interim Consolidated Financial Statements of HarborOne Bancorp, Inc. presented herein have been prepared pursuant to the rules of the SEC for quarterly reports on Form 10-Q and do not include all of the information and note disclosures required by GAAP. In the opinion of management, all adjustments and disclosures considered necessary for the fair presentation of the accompanying unaudited interim Consolidated Financial Statements have been included. Interim results are not necessarily reflective of the results of the entire year. The accompanying unaudited interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements for the years ended December 31, 2023 and 2022 and notes thereto included in the Company’s Annual Report on Form 10-K. ​ The unaudited interim Consolidated Financial Statements include the accounts of the Company; the Company’s subsidiaries, Legion Parkway Company LLC (a security corporation) and HarborOne Bank; and the Bank’s wholly-owned subsidiaries, which consist of HarborOne Mortgage, LLC, HarborOne Security Company, Inc. and a passive investment corporation. The passive investment corporation maintains and manages certain assets of the Bank. The security company was established for the purpose of buying, holding and selling securities on its own behalf. All significant intercompany balances and transactions have been eliminated in consolidation. ​ Certain prior year amounts have been reclassified to conform to the current year financial statement presentation. These changes and reclassifications did not impact previously reported net income or comprehensive income. ​ Nature of Operations ​ The Company provides a variety of financial services to individuals and businesses through its 30 full-service branches in Massachusetts and Rhode Island, and a commercial lending office in each of Boston, Massachusetts and Providence, Rhode Island. HarborOne Mortgage maintains offices in Florida, Maine, Massachusetts, New Hampshire, New Jersey and Rhode Island and originates loans in five additional states. ​ The Company’s primary deposit products are checking, money market, savings, and term certificate of deposit accounts, while its primary lending products are commercial real estate, commercial, residential mortgages, home equity, and consumer loans. The Company also originates, sells and services residential mortgage loans through HarborOne Mortgage. ​ Risks and Uncertainties ​ Macroeconomic trends are mixed as uncertainty remains about the economy and banking industry. ​ Reliance on secondary funding sources could increase the Company’s overall cost of funds and thereby reduce net income. While the Company believes its current sources of liquidity are adequate to fund operations, there is no guarantee they will suffice to meet future liquidity demands. This may necessitate slowing or discontinuing loan growth, capital expenditures, or other investments, or liquidating assets. ​ Additionally, the Company could experience adverse effects on its business, financial condition, results of operations and cash flows if there is severe or prolonged inflation, a recession, or further escalation of the current geopolitical situation. While asset quality continues to point to economic recovery, the Company’s customers could experience similar adverse effects from these uncertainties that would impair their ability to fulfill their financial obligations to the Company resulting in deteriorating credit quality and loan charge-offs. ​ Summary of Significant Accounting Policies and Recently Adopted Accounting Standards Updates ​ Significant accounting policies in effect and disclosed within the Company’s most recent audited Consolidated Financial Statements as of December 31, 2023 remain substantially unchanged. ​ ​

DEBT SECURITIES

DEBT SECURITIES	3 Months Ended
	Mar. 31, 2024
DEBT SECURITIES
DEBT SECURITIES	2. DEBT SECURITIES ​ The following is a summary of securities available for sale and held to maturity: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ Allowance ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ for Credit ​ Fair ​ Cost Gains Losses Losses Value ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available for sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ 47,143 ​ $ — ​ $ 7,127 ​ $ — ​ $ 40,016 U.S. government agency and government-sponsored residential mortgage-backed securities ​ ​ 305,548 ​ ​ 9 ​ ​ 59,486 ​ ​ — ​ ​ 246,071 U.S. government-sponsored collateralized mortgage obligations ​ ​ 1,656 ​ ​ — ​ ​ 66 ​ ​ — ​ ​ 1,590 SBA asset-backed securities ​ ​ 1,607 ​ ​ — ​ ​ 90 ​ ​ — ​ ​ 1,517 Corporate bonds ​ ​ 2,000 ​ ​ — ​ ​ 186 ​ ​ — ​ ​ 1,814 Total securities available for sale ​ $ 357,954 ​ $ 9 ​ $ 66,955 ​ $ — ​ $ 291,008 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities held to maturity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ 15,000 ​ $ — ​ $ 477 ​ $ — ​ $ 14,523 SBA asset-backed securities ​ ​ 4,724 ​ ​ — ​ ​ 145 ​ ​ — ​ ​ 4,579 Total securities held to maturity ​ $ 19,724 ​ $ — ​ $ 622 ​ $ — ​ $ 19,102 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ Allowance ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ for Credit ​ Fair ​ ​ Cost Gains Losses Losses ​ Value ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available for sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ 47,143 ​ $ — ​ $ 6,961 ​ $ — ​ $ 40,182 U.S. government agency and government-sponsored residential mortgage-backed securities ​ ​ 300,277 ​ ​ 3 ​ ​ 54,683 ​ ​ — ​ ​ 245,597 U.S. government-sponsored collateralized mortgage obligations ​ ​ 1,852 ​ ​ — ​ ​ 70 ​ ​ — ​ ​ 1,782 SBA asset-backed securities ​ ​ 1,885 ​ ​ — ​ ​ 107 ​ ​ — ​ ​ 1,778 Corporate bonds ​ ​ 1,000 ​ ​ — ​ ​ 188 ​ ​ — ​ ​ 812 Total securities available for sale ​ $ 352,157 ​ $ 3 ​ $ 62,009 ​ $ — ​ $ 290,151 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities held to maturity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ 15,000 ​ $ — ​ $ 438 ​ $ — ​ $ 14,562 SBA asset-backed securities ​ ​ 4,796 ​ ​ — ​ ​ 96 ​ ​ — ​ ​ 4,700 Total securities held to maturity ​ $ 19,796 ​ $ — ​ $ 534 ​ $ — ​ $ 19,262 ​ ​ Accrued interest receivable is excluded from the amortized cost basis of debt securities. Accrued interest receivable totaled $959,000 and $940,000 as of March 31, 2024 and December 31, 2023, respectively. At March 31, 2024, available-for-sale debt securities with a fair value of $158.3 million were pledged for the BTFP borrowing, and available-for-sale debt securities with a fair value of $129.4 million and held-to-maturity securities with a fair value of $14.5 million were pledged as collateral to provide borrowing capacity through the FRB BIC line. ​ The amortized cost and fair value of debt securities by contractual maturity at March 31, 2024 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available for Sale ​ Held to Maturity ​ ​ Amortized ​ Fair ​ Amortized ​ Fair ​ Cost Value Cost Value ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ After 1 year through 5 years ​ $ 7,998 ​ $ 7,564 ​ $ 15,000 ​ $ 14,523 After 5 years through 10 years ​ ​ 41,145 ​ ​ 34,266 ​ ​ — ​ ​ — ​ ​ ​ 49,143 ​ ​ 41,830 ​ ​ 15,000 ​ ​ 14,523 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government agency and government-sponsored residential mortgage-backed securities ​ ​ 305,548 ​ ​ 246,071 ​ ​ — ​ ​ — U.S. government-sponsored collateralized mortgage obligations ​ ​ 1,656 ​ ​ 1,590 ​ ​ — ​ ​ — SBA asset-backed securities ​ ​ 1,607 ​ ​ 1,517 ​ ​ 4,724 ​ ​ 4,579 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 357,954 ​ $ 291,008 ​ $ 19,724 ​ $ 19,102 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government-sponsored residential mortgage-backed securities, collateralized mortgage obligations, and securities whose underlying assets are loans from the SBA have stated maturities of one to 29 years ; however, it is expected that such securities will have shorter actual lives due to prepayments. U.S. government and government-sponsored enterprise obligations and corporate bonds are callable at the discretion of the issuer. U.S. government and government-sponsored enterprise obligations and corporate bonds with a total fair value of $56.4 million have a final maturity of three to eight years and a call feature of one month to three years . At March 31, 2024, there were no holdings of securities of any one issuer, other than the U.S. government and its agencies, in an amount greater than 10% of shareholder equity. There were no sales or calls of securities in the three months ended March 31, 2024 and 2023, respectively. ​ Information pertaining to securities with gross unrealized losses at March 31, 2024 and December 31, 2023 aggregated by investment category and length of time that individual securities have been in a continuous loss position follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less Than Twelve Months ​ Twelve Months and Over ​ ​ Gross ​ ​ ​ Gross ​ ​ ​ ​ Unrealized ​ Fair ​ Unrealized ​ Fair ​ Losses Value Losses Value ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available for sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ — ​ $ — ​ $ 7,127 ​ $ 40,016 U.S. government agency and government-sponsored residential mortgage-backed securities ​ ​ 47 ​ ​ 9,249 ​ ​ 59,439 ​ ​ 231,934 U.S. government-sponsored collateralized mortgage obligations ​ ​ — ​ ​ — ​ ​ 66 ​ ​ 1,590 SBA asset-backed securities ​ ​ — ​ ​ — ​ ​ 90 ​ ​ 1,517 Corporate bonds ​ ​ — ​ ​ — ​ ​ 186 ​ ​ 814 ​ ​ $ 47 ​ $ 9,249 ​ $ 66,908 ​ $ 275,871 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities held to maturity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ — ​ $ — ​ ​ 477 ​ ​ 14,523 SBA asset-backed securities ​ ​ 145 ​ ​ 4,579 ​ ​ — ​ ​ — ​ ​ $ 145 ​ $ 4,579 ​ $ 477 ​ $ 14,523 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available for sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ — ​ $ — ​ $ 6,961 ​ $ 40,182 U.S. government agency and government-sponsored residential mortgage-backed securities ​ ​ — ​ ​ — ​ ​ 54,683 ​ ​ 240,955 U.S. government-sponsored collateralized mortgage obligations ​ ​ — ​ ​ — ​ ​ 70 ​ ​ 1,782 SBA asset-backed securities ​ ​ — ​ ​ — ​ ​ 107 ​ ​ 1,778 Corporate bonds ​ ​ — ​ ​ — ​ ​ 188 ​ ​ 812 ​ ​ $ — ​ $ — ​ $ 62,009 ​ $ 285,509 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities held to maturity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ — ​ $ — ​ ​ 438 ​ ​ 14,562 SBA asset-backed securities ​ ​ 96 ​ ​ 4,700 ​ ​ — ​ ​ — ​ ​ $ 96 ​ $ 4,700 ​ $ 438 ​ $ 14,562 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Management assesses the decline in fair value of investment securities on a regular basis. Unrealized losses on debt securities may occur from current market conditions, increases in interest rates since the time of purchase, a structural change in an investment, volatility of earnings of a specific issuer, or deterioration in credit quality of the issuer. Management evaluates both qualitative and quantitative factors to assess whether an impairment exists. ​ As of March 31, 2024, the Company’s security portfolio consisted of 136 debt securities, 133 of which were in an unrealized loss position. The unrealized losses are primarily related to the Company’s debt securities that were issued by U.S. government-sponsored enterprises and agencies. The Company does not believe that the debt securities that were in an unrealized loss position as of March 31, 2024 represent a credit loss impairment. As of March 31, 2024, and December 31, 2023, the gross unrealized loss positions were primarily related to mortgage-backed securities and other obligations issued by U.S. government agencies or U.S. government-sponsored enterprises. These securities carry the explicit and/or implicit guarantee of the U.S. government and have a long history of zero credit loss. Total gross unrealized losses were primarily attributable to changes in interest rates relative to when the investment securities were purchased, and not due to the credit quality of the investment securities. ​ Management reviewed the collectability of the corporate bonds taking into consideration such factors as the financial condition of the issuers, reported regulatory capital ratios of the issuers, credit ratings, including ratings in effect as of the reporting period date as well as credit rating changes between the reporting period date and the filing date of this report, and other information. Management believes the unrealized losses on the corporate bonds are primarily attributable to changes in the investment spreads and interest rates and not changes in the credit quality of the issuers of the corporate bonds. Management expects to recover the entire amortized cost basis of the available-for-sale debt securities with an unrealized loss. Furthermore, the Company does not intend to sell these securities, and it is unlikely that the Company will be required to sell these securities, before recovery of their cost basis, which may be at maturity. Therefore, no ACL was recorded at March 31, 2024 . ​ As of March 31, 2024 , the held-to-maturity securities were U.S. government-sponsored enterprise obligations. These securities are guaranteed by the government-sponsored enterprise with a long history of no credit losses and Management has determined these securities to have a zero loss expectation and therefore does not estimate an ACL on these securities.

LOANS HELD FOR SALE

LOANS HELD FOR SALE	3 Months Ended
	Mar. 31, 2024
LOANS HELD FOR SALE
LOANS HELD FOR SALE	3. LOANS HELD FOR SALE ​ The following table provides the fair value and contractual principal balance outstanding of loans held for sale accounted for under the fair value option: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ December 31, ​ ​ 2024 2023 ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans held for sale, fair value ​ $ 16,434 ​ $ 19,686 ​ Loans held for sale, contractual principal outstanding ​ ​ 16,125 ​ ​ 19,155 ​ Fair value less unpaid principal balance ​ $ 309 ​ $ 531 ​ ​ The Company has elected the fair value option for mortgage loans held for sale to better match changes in fair value of the loans with changes in the fair value of the forward sale commitment contracts used to economically hedge them. Changes in fair value of mortgage loans held for sale accounted for under the fair value option election amounted to a decrease of $222,000 in the three months ended March 31, 2024 to $309,000, compared to an increase of $8,000 to $344,000 in the three months ended March 31, 2023. These amounts are offset in earnings by the changes in fair value of forward sale commitments. The changes in fair value are reported as a component of gain on sale of mortgage loans in the unaudited Consolidated Statements of Income. ​ At March 31, 2024 and December 31, 2023, there were no loans held for sale that were greater than 90 days past due.

LOANS AND ALLOWANCE FOR CREDIT

LOANS AND ALLOWANCE FOR CREDIT LOSSES	3 Months Ended
	Mar. 31, 2024
LOANS AND ALLOWANCE FOR CREDIT LOSSES
LOANS AND ALLOWANCE FOR CREDIT LOSSES	4. LOANS AND ALLOWANCE FOR CREDIT LOSSES ​ A summary of the balances of loans follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ December 31, ​ ​ 2024 2023 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate: ​ ​ ​ ​ ​ ​ ​ One- to four-family ​ $ 1,507,959 ​ $ 1,513,554 ​ Second mortgages and equity lines of credit ​ ​ 173,613 ​ ​ 177,135 ​ Residential real estate construction ​ ​ 14,650 ​ ​ 18,132 ​ Total residential real estate loans ​ ​ 1,696,222 ​ ​ 1,708,821 ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial: ​ ​ ​ ​ ​ ​ ​ Commercial real estate ​ ​ 2,355,672 ​ ​ 2,343,675 ​ Commercial construction ​ ​ 234,811 ​ ​ 208,443 ​ Commercial and industrial ​ ​ 471,215 ​ ​ 466,443 ​ Total commercial loans ​ ​ 3,061,698 ​ ​ 3,018,561 ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer loans: ​ ​ ​ ​ ​ ​ ​ Auto ​ ​ 11,888 ​ ​ 13,603 ​ Personal ​ ​ 7,413 ​ ​ 8,433 ​ Total consumer loans ​ ​ 19,301 ​ ​ 22,036 ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans before basis adjustment ​ ​ 4,777,221 ​ ​ 4,749,418 ​ Basis adjustment associated with fair value hedge (1) ​ ​ (536) ​ ​ 893 ​ Total loans ​ ​ 4,776,685 ​ ​ 4,750,311 ​ Allowance for credit losses on loans ​ ​ (48,185) ​ ​ (47,972) ​ Loans, net ​ $ 4,728,500 ​ $ 4,702,339 ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) Note 10 - Derivatives ​ ​ ​ The net unamortized deferred loan origination costs included in total loans and leases were $8.7 million and $8.5 million as of March 31, 2024 and December 31, 2023, respectively. ​ As of March 31, 2024 and December 31, 2023, the commercial and industrial loans includes $278,000 and $321,000, respectively, of SBA PPP loans and $32,000 and $36,000, respectively, of deferred fees on the PPP loans. PPP loans are fully guaranteed by the U.S. government. ​ The Company has transferred a portion of its originated commercial loans to participating lenders. The amounts transferred have been accounted for as sales and are therefore not included in the Company’s accompanying unaudited interim Consolidated Balance Sheets. The Company and participating lenders share ratably in cash flows and any gains or losses that may result from a borrower’s lack of compliance with contractual terms of the loan. The Company continues to service the loans on behalf of the participating lenders and, as such, collects cash payments from the borrowers, remits payments to participating lenders, and disburses required escrow funds to relevant parties. At March 31, 2024 and December 31, 2023, the Company was servicing commercial loans for participants in the aggregate amount of $416.1 million and $413.0 million, respectively. ​ ​ ​ The following table presents the activity in the ACL on loans for the three months ended March 31, 2024 and 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Second Mortgages ​ Residential ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to Four- ​ and Equity ​ Real Estate ​ Commercial ​ Commercial ​ Commercial ​ ​ ​ ​ ​ ​ Family Lines of Credit Construction Real Estate Construction and Industrial Consumer Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at December 31, 2023 ​ $ 12,101 ​ $ 964 ​ $ 418 ​ $ 21,288 ​ $ 4,824 ​ $ 8,107 ​ $ 270 ​ $ 47,972 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ (228) ​ ​ (49) ​ ​ (277) Recoveries ​ ​ — ​ ​ 3 ​ ​ — ​ ​ 100 ​ ​ — ​ ​ 46 ​ ​ 3 ​ ​ 152 Provision ​ ​ (66) ​ ​ (25) ​ ​ (87) ​ ​ (125) ​ ​ 498 ​ ​ 138 ​ ​ 5 ​ ​ 338 Balance at March 31, 2024 ​ $ 12,035 ​ $ 942 ​ $ 331 ​ $ 21,263 ​ $ 5,322 ​ $ 8,063 ​ $ 229 ​ $ 48,185 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Second Mortgages ​ Residential ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to Four- ​ and Equity ​ Real Estate ​ Commercial ​ Commercial ​ Commercial ​ ​ ​ ​ ​ ​ Family Lines of Credit Construction Real Estate Construction and Industrial Consumer Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at December 31, 2022 ​ $ 11,532 ​ $ 924 ​ $ 280 ​ $ 20,357 ​ $ 4,645 ​ $ 7,236 ​ $ 262 ​ $ 45,236 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ (7) ​ ​ (7) ​ ​ (14) Recoveries ​ ​ 1 ​ ​ 7 ​ ​ — ​ ​ 1 ​ ​ — ​ ​ — ​ ​ 16 ​ ​ 25 Provision ​ ​ (25) ​ ​ 36 ​ ​ 475 ​ ​ 584 ​ ​ 412 ​ ​ 255 ​ ​ 10 ​ ​ 1,747 Balance at March 31, 2023 ​ $ 11,508 ​ $ 967 ​ $ 755 ​ $ 20,942 ​ $ 5,057 ​ $ 7,484 ​ $ 281 ​ $ 46,994 ​ ​ ​ ​ ​ As of March 31, 2024, the carrying value of individually analyzed loans amounted to $12.2 million, with a related allowance of $72,000, and $12.1 million of individually analyzed loans were considered collateral-dependent. As of December 31, 2023, the carrying value of individually analyzed loans amounted to $17.5 million, with a related allowance of $108,000, and $17.3 million were considered collateral-dependent. ​ For collateral-dependent loans where management has determined that foreclosure of the collateral is probable, or where the borrower is experiencing financial difficulty and repayment of the loan is to be provided substantially through the operation or sale of the collateral, the ACL is measured based on the difference between the fair value of the collateral and the amortized cost basis of the loan as of the measurement date. ​ The following table presents the carrying value of collateral-dependent individually analyzed loans as of March 31, 2024 and December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ December 31, 2023 ​ ​ ​ ​ ​ Related ​ ​ ​ ​ Related ​ Carrying Value Allowance ​ Carrying Value ​ Allowance ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate ​ $ 1,496 ​ $ 5 ​ $ 7,416 ​ $ 5 Commercial and industrial ​ ​ 1,744 ​ ​ 67 ​ ​ 1,793 ​ ​ 101 Commercial construction ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total Commercial ​ ​ 3,240 ​ ​ 72 ​ ​ 9,209 ​ ​ 106 Residential real estate ​ ​ 8,866 ​ ​ — ​ ​ 8,054 ​ ​ — Total ​ $ 12,106 ​ $ 72 ​ $ 17,263 ​ $ 106 ​ ​ The following is a summary of past due and non-accrual loans at March 31, 2024 and December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 Days ​ ​ ​ ​ ​ ​ ​ 30-59 Days ​ 60-89 Days ​ or More ​ Total ​ Loans on ​ ​ Past Due Past Due Past Due Past Due Non-accrual ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to four-family ​ $ 2,596 ​ $ 682 ​ $ 5,209 ​ $ 8,487 ​ $ 8,158 ​ Second mortgages and equity lines of credit ​ ​ 10 ​ ​ 608 ​ ​ 316 ​ ​ 934 ​ ​ 708 ​ Commercial real estate ​ ​ 850 ​ ​ 641 ​ ​ 5 ​ ​ 1,496 ​ ​ 1,496 ​ Commercial construction ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ Commercial and industrial ​ ​ 66 ​ ​ 603 ​ ​ 1,301 ​ ​ 1,970 ​ ​ 1,744 ​ Consumer: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Auto ​ ​ 66 ​ ​ — ​ ​ 2 ​ ​ 68 ​ ​ 27 ​ Personal ​ ​ 53 ​ ​ 25 ​ ​ 18 ​ ​ 96 ​ ​ 27 ​ Total ​ $ 3,641 ​ $ 2,559 ​ $ 6,851 ​ $ 13,051 ​ $ 12,160 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to four-family ​ $ 4,704 ​ $ 2,413 ​ $ 4,418 ​ $ 11,535 ​ $ 7,785 ​ Second mortgages and equity lines of credit ​ ​ 164 ​ ​ 130 ​ ​ 57 ​ ​ 351 ​ ​ 473 ​ Commercial real estate ​ ​ — ​ ​ — ​ ​ 5,751 ​ ​ 5,751 ​ ​ 7,416 ​ Commercial construction ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ Commercial and industrial ​ ​ 247 ​ ​ 166 ​ ​ 1,332 ​ ​ 1,745 ​ ​ 1,791 ​ Consumer: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Auto ​ ​ 96 ​ ​ 69 ​ ​ 4 ​ ​ 169 ​ ​ 4 ​ Personal ​ ​ 16 ​ ​ 5 ​ ​ 31 ​ ​ 52 ​ ​ 44 ​ Total ​ $ 5,227 ​ $ 2,783 ​ $ 11,593 ​ $ 19,603 ​ $ 17,513 ​ ​ At March 31, 2024 and December 31, 2023, there were no loans past due 90 days or more and still accruing. ​ ​ Loan Modifications to Borrowers Experiencing Financial Difficulty The Bank will modify the contractual terms of loans to a borrower experiencing financial difficulties as a way to mitigate loss and comply with regulations regarding bankruptcy and discharge situations. Modifications to borrowers experiencing financial difficulty may include interest rate reductions, principal or interest forgiveness, forbearances, term extensions, and other actions intended to minimize economic loss and to avoid foreclosure or repossession of collateral. ​ There were no material loan modifications based on borrower financial difficulty during the three months ended March 31, 2024 and 2023. There were no loans to borrowers experiencing financial difficulty that had a payment default during the three months ended March 31, 2024 and 2023 and were modified in the twelve months prior to that default. Default is determined at 90 or more days past due, upon charge-off, or upon foreclosure. Modified loans in default are individually evaluated for the allowance for credit losses or if the modified loan is deemed uncollectible, the loan, or a portion of the loan, is written off, and the allowance for credit losses is adjusted accordingly. ​ ​ Credit Quality Indicators ​ Commercial ​ The Company uses a ten-grade internal loan rating system for commercial real estate, commercial construction and commercial loans, as follows: ​ Loans rated 1 – 6 are considered “pass”-rated loans with low to average risk. ​ Loans rated 7 are considered “special mention.” These loans are starting to show signs of potential weakness and are being closely monitored by management. ​ Loans rated 8 are considered “substandard.” Generally, a loan is considered substandard if it is inadequately protected by the current net worth and paying capacity of the obligors and/or the collateral pledged. There is a distinct possibility that the Company will sustain some loss if the weakness is not corrected. ​ Loans rated 9 are considered “doubtful.” Loans classified as doubtful have all the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, highly questionable and improbable. ​ Loans rated 10 are considered “uncollectible” (loss), and of such little value that their continuance as loans is not warranted. ​ Loans not rated consist primarily of certain smaller balance commercial real estate and commercial loans that are managed by exception. ​ On an annual basis, or more often if needed, the Company formally reviews on a risk-adjusted basis, the ratings on substantially all commercial real estate, construction and commercial loans. Semi-annually, the Company engages an independent third party to review a significant portion of loans within these segments. Management uses the results of these reviews as part of its annual review process. ​ Residential and Consumer ​ On a monthly basis, the Company reviews the residential construction, residential real estate, and consumer installment portfolios for credit quality primarily through the use of delinquency reports. ​ The following table summarizes the Company’s loan portfolio by credit quality indicator and loan portfolio segment as of March 31, 2024: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ Loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans ​ Converted ​ ​ ​ ​ ​ Term Loans at Amortized Cost by Origination Year ​ Amortized ​ to Term ​ ​ ​ ​ ​ 2024 ​ 2023 ​ 2022 ​ 2021 ​ 2020 ​ Prior ​ Cost ​ Loans ​ Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of March 31, 2024 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 24,559 ​ $ 147,200 ​ $ 826,882 ​ $ 455,253 ​ $ 233,191 ​ $ 614,772 ​ $ — ​ $ — ​ $ 2,301,857 Special mention ​ ​ — ​ ​ 1,600 ​ ​ 18,839 ​ ​ — ​ ​ 4,293 ​ ​ 27,587 ​ ​ — ​ ​ — ​ ​ 52,319 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,496 ​ ​ — ​ ​ — ​ ​ 1,496 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ ​ ​ ​ — ​ ​ — ​ ​ — Total commercial real estate ​ ​ 24,559 ​ ​ 148,800 ​ ​ 845,721 ​ ​ 455,253 ​ ​ 237,484 ​ ​ 643,855 ​ ​ — ​ ​ — ​ ​ 2,355,672 YTD gross charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 11,690 ​ ​ 73,215 ​ ​ 50,703 ​ ​ 92,676 ​ ​ 68,905 ​ ​ 94,486 ​ ​ 76,180 ​ ​ — ​ ​ 467,855 Special mention ​ ​ — ​ ​ — ​ ​ 427 ​ ​ 184 ​ ​ 22 ​ ​ 883 ​ ​ 100 ​ ​ — ​ ​ 1,616 Substandard ​ ​ — ​ ​ — ​ ​ 2 ​ ​ — ​ ​ 50 ​ ​ 390 ​ ​ — ​ ​ — ​ ​ 442 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,253 ​ ​ 49 ​ ​ — ​ ​ 1,302 Total commercial and industrial ​ ​ 11,690 ​ ​ 73,215 ​ ​ 51,132 ​ ​ 92,860 ​ ​ 68,977 ​ ​ 97,012 ​ ​ 76,329 ​ ​ — ​ ​ 471,215 YTD gross charge-offs ​ ​ — ​ ​ — ​ ​ 153 ​ ​ 65 ​ ​ 3 ​ ​ 7 ​ ​ — ​ ​ — ​ ​ 228 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ — ​ ​ 45,676 ​ ​ 110,181 ​ ​ 64,268 ​ ​ — ​ ​ — ​ ​ 721 ​ ​ — ​ ​ 220,846 Special mention ​ ​ — ​ ​ 4,240 ​ ​ 9,725 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 13,965 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total commercial construction ​ ​ — ​ ​ 49,916 ​ ​ 119,906 ​ ​ 64,268 ​ ​ — ​ ​ — ​ ​ 721 ​ ​ — ​ ​ 234,811 YTD gross charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual ​ ​ 12,179 ​ ​ 135,862 ​ ​ 431,542 ​ ​ 471,589 ​ ​ 199,720 ​ ​ 271,197 ​ ​ 163,938 ​ ​ 1,329 ​ ​ 1,687,356 Non-accrual ​ ​ — ​ ​ — ​ ​ 467 ​ ​ 294 ​ ​ 322 ​ ​ 7,363 ​ ​ 412 ​ ​ 8 ​ ​ 8,866 Total residential real estate ​ ​ 12,179 ​ ​ 135,862 ​ ​ 432,009 ​ ​ 471,883 ​ ​ 200,042 ​ ​ 278,560 ​ ​ 164,350 ​ ​ 1,337 ​ ​ 1,696,222 YTD gross charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual ​ ​ 2,349 ​ ​ 5,510 ​ ​ 4,791 ​ ​ 1,912 ​ ​ 803 ​ ​ 2,928 ​ ​ 954 ​ ​ — ​ ​ 19,247 Non-accrual ​ ​ — ​ ​ 4 ​ ​ 12 ​ ​ — ​ ​ 4 ​ ​ 28 ​ ​ 6 ​ ​ — ​ ​ 54 Total Consumer ​ ​ 2,349 ​ ​ 5,514 ​ ​ 4,803 ​ ​ 1,912 ​ ​ 807 ​ ​ 2,956 ​ ​ 960 ​ ​ — ​ ​ 19,301 YTD gross charge-offs ​ ​ — ​ ​ 14 ​ ​ 5 ​ ​ 19 ​ ​ — ​ ​ 11 ​ ​ — ​ ​ — ​ ​ 49 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans before basis adjustment ​ $ 50,777 ​ $ 413,307 ​ $ 1,453,571 ​ $ 1,086,176 ​ $ 507,310 ​ $ 1,022,383 ​ $ 242,360 ​ $ 1,337 ​ $ 4,777,221 Total YTD gross charge-offs ​ $ — ​ $ 14 ​ $ 158 ​ $ 84 ​ $ 3 ​ $ 18 ​ $ — ​ $ — ​ $ 277 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table summarizes the Company’s loan portfolio by credit quality indicator and loan portfolio segment as of December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ Loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans ​ Converted ​ ​ ​ ​ ​ Term Loans at Amortized Cost by Origination Year ​ Amortized ​ to Term ​ ​ ​ ​ ​ 2023 ​ 2022 ​ 2021 ​ 2020 ​ 2019 ​ Prior ​ Cost ​ Loans ​ Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 152,047 ​ $ 828,335 ​ $ 455,996 ​ $ 234,585 ​ $ 233,713 ​ $ 405,103 ​ $ — ​ $ — ​ $ 2,309,779 Special mention ​ ​ — ​ ​ 10,971 ​ ​ — ​ ​ 4,300 ​ ​ 8,977 ​ ​ 2,232 ​ ​ — ​ ​ — ​ ​ 26,480 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,670 ​ ​ — ​ ​ — ​ ​ 1,670 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 5,746 ​ ​ — ​ ​ — ​ ​ 5,746 Total commercial real estate ​ ​ 152,047 ​ ​ 839,306 ​ ​ 455,996 ​ ​ 238,885 ​ ​ 242,690 ​ ​ 414,751 ​ ​ — ​ ​ — ​ ​ 2,343,675 YTD gross charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 4,171 ​ ​ — ​ ​ — ​ ​ 4,171 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 73,240 ​ ​ 52,190 ​ ​ 94,570 ​ ​ 70,565 ​ ​ 22,988 ​ ​ 75,493 ​ ​ 74,125 ​ ​ — ​ ​ 463,171 Special mention ​ ​ — ​ ​ 454 ​ ​ 4 ​ ​ 23 ​ ​ 2 ​ ​ 948 ​ ​ 50 ​ ​ — ​ ​ 1,481 Substandard ​ ​ — ​ ​ 52 ​ ​ 8 ​ ​ — ​ ​ — ​ ​ 367 ​ ​ 18 ​ ​ — ​ ​ 445 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,297 ​ ​ 49 ​ ​ — ​ ​ 1,346 Total commercial and industrial ​ ​ 73,240 ​ ​ 52,696 ​ ​ 94,582 ​ ​ 70,588 ​ ​ 22,990 ​ ​ 78,105 ​ ​ 74,242 ​ ​ — ​ ​ 466,443 YTD gross charge-offs ​ ​ 24 ​ ​ 113 ​ ​ 14 ​ ​ 5 ​ ​ 8 ​ ​ 2 ​ ​ — ​ ​ — ​ ​ 166 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 35,181 ​ ​ 109,291 ​ ​ 60,113 ​ ​ 843 ​ ​ — ​ ​ — ​ ​ 425 ​ ​ — ​ ​ 205,853 Special mention ​ ​ — ​ ​ 2,590 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 2,590 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total commercial construction ​ ​ 35,181 ​ ​ 111,881 ​ ​ 60,113 ​ ​ 843 ​ ​ — ​ ​ — ​ ​ 425 ​ ​ — ​ ​ 208,443 YTD gross charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual ​ ​ 138,541 ​ ​ 434,421 ​ ​ 480,010 ​ ​ 202,118 ​ ​ 38,675 ​ ​ 239,185 ​ ​ 166,144 ​ ​ 1,469 ​ ​ 1,700,563 Non-accrual ​ ​ — ​ ​ — ​ ​ — ​ ​ 127 ​ ​ 956 ​ ​ 6,959 ​ ​ 216 ​ ​ — ​ ​ 8,258 Total residential real estate ​ ​ 138,541 ​ ​ 434,421 ​ ​ 480,010 ​ ​ 202,245 ​ ​ 39,631 ​ ​ 246,144 ​ ​ 166,360 ​ ​ 1,469 ​ ​ 1,708,821 YTD gross charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual ​ ​ 8,218 ​ ​ 5,366 ​ ​ 2,254 ​ ​ 1,021 ​ ​ 3,135 ​ ​ 963 ​ ​ 1,031 ​ ​ — ​ ​ 21,988 Non-accrual ​ ​ 14 ​ ​ 18 ​ ​ 5 ​ ​ — ​ ​ 2 ​ ​ 4 ​ ​ 5 ​ ​ — ​ ​ 48 Total Consumer ​ ​ 8,232 ​ ​ 5,384 ​ ​ 2,259 ​ ​ 1,021 ​ ​ 3,137 ​ ​ 967 ​ ​ 1,036 ​ ​ — ​ ​ 22,036 YTD gross charge-offs ​ ​ 7 ​ ​ 16 ​ ​ 4 ​ ​ 15 ​ ​ 18 ​ ​ 29 ​ ​ — ​ ​ — ​ ​ 89 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans before basis adjustment ​ $ 407,241 ​ $ 1,443,688 ​ $ 1,092,960 ​ $ 513,582 ​ $ 308,448 ​ $ 739,967 ​ $ 242,063 ​ $ 1,469 ​ $ 4,749,418 Total YTD gross charge-offs ​ $ 31 ​ $ 129 ​ $ 18 ​ $ 20 ​ $ 26 ​ $ 4,202 ​ $ — ​ $ — ​ $ 4,426 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

MORTGAGE LOAN SERVICING

MORTGAGE LOAN SERVICING	3 Months Ended
	Mar. 31, 2024
MORTGAGE LOAN SERVICING
MORTGAGE LOAN SERVICING	5. MORTGAGE LOAN SERVICING ​ The Company sells residential mortgages to government-sponsored enterprises and other parties. The Company retains no beneficial interests in these loans, but it may retain the servicing rights of the loans sold. Mortgage loans serviced for others are not included in the accompanying unaudited interim Consolidated Balance Sheets. The risks inherent in MSRs relate primarily to changes in prepayments that generally result from shifts in mortgage interest rates. The unpaid principal balance of mortgage loans serviced for others was $3.52 billion and $3.56 billion as of March 31, 2024 and December 31, 2023, respectively. ​ The Company accounts for MSRs at fair value. The Company obtains and reviews valuations from an independent third party to determine the fair value of MSRs. Key assumptions used in the estimation of fair value include prepayment speeds, discount rates, and default rates . At March 31, 2024 and December 31, 2023, the following weighted average assumptions were used in the calculation of fair value of MSRs: ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ December 31, ​ ​ 2024 2023 Prepayment speed ​ 7.50 % 7.60 % Discount rate ​ 9.94 ​ 9.81 ​ Default rate ​ 1.88 ​ 2.27 ​ ​ ​ The following summarizes changes to MSRs for the three months ended March 31, 2024 and 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ 2024 ​ 2023 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ Balance, beginning of period ​ $ 46,111 ​ $ 48,138 Additions ​ ​ 211 ​ ​ 634 Changes in fair value due to: ​ ​ ​ ​ ​ ​ Reductions from loans paid off during the period ​ ​ (353) ​ ​ (371) Changes in valuation inputs or assumptions ​ ​ 628 ​ ​ (1,321) Balance, end of period ​ $ 46,597 ​ $ 47,080 ​ ​ Contractually specified servicing fees, net of subservicing expense, included in other mortgage banking income amounted to $2.0 million for the three months ended March 31, 2024 and $2.0 million for the three months ended March 31, 2023.

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	3 Months Ended
	Mar. 31, 2024
GOODWILL AND OTHER INTANGIBLE ASSETS
GOODWILL AND OTHER INTANGIBLE ASSETS	6. GOODWILL AND OTHER INTANGIBLE ASSETS ​ At March 31, 2024 and December 31, 2023, the carrying value of the Bank’s goodwill was $59.0 million as of both dates. In connection with the annual goodwill impairment test as of October 31, 2023, it was determined that HarborOne Mortgage’s goodwill was 100% impaired, and a $10.8 million goodwill impairment charge was recorded for the period ended December 31, 2023. ​ Goodwill is tested for impairment annually on October 31 or on an interim basis if an event triggering impairment may have occurred. As of March 31, 2024, the Company assessed whether there were additional events or changes in circumstances since its annual goodwill impairment test that would indicate that it was more likely than not that the fair value of the reporting unit was less than the reporting unit’s carrying amounts that would require an interim impairment assessment after October 31, 2023. The Company determined there had been no such indicators, therefore, no interim goodwill impairment assessment as of March 31, 2024 was performed. ​ The process of evaluating fair value is highly subjective and requires significant judgment and estimates. The goodwill at the Bank is at risk of future impairment in the event of a sustained decline in the value of its stock as well as values of other financial institutions, declines in revenue for the Company beyond our current forecasts, or significant adverse changes in the operating environment for the financial industry. ​ Other intangible assets were $1.3 million and are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. The Company determined that there was no triggering event that warranted an interim impairment test at March 31, 2024. ​ ​ ​

DEPOSITS

DEPOSITS	3 Months Ended
	Mar. 31, 2024
DEPOSITS
DEPOSITS	7. DEPOSITS ​ A summary of deposit balances, by type, is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ December 31, ​ ​ 2024 2023 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ NOW and demand deposit accounts $ 982,223 ​ $ 965,798 ​ Regular savings and club accounts ​ ​ 1,110,404 ​ ​ 1,265,315 ​ Money market deposit accounts ​ ​ 1,061,145 ​ ​ 966,201 ​ Total non-certificate accounts ​ ​ 3,153,772 ​ ​ 3,197,314 ​ ​ ​ ​ ​ ​ ​ ​ ​ Term certificate accounts greater than $250,000 ​ ​ 219,050 ​ ​ 240,702 ​ Term certificate accounts less than or equal to $250,000 ​ ​ 633,276 ​ ​ 622,755 ​ Brokered deposits ​ ​ 387,926 ​ ​ 326,638 ​ Total certificate accounts ​ ​ 1,240,252 ​ ​ 1,190,095 ​ Total deposits ​ $ 4,394,024 ​ $ 4,387,409 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total municipal deposits included in the table amounted to $487.0 million at March 31, 2024 and $471.8 million at December 31, 2023. Municipal deposits are generally required to be fully insured. The Company provided supplemental insurance for municipal deposits through a reciprocal deposit program and letters of credit offered by the FHLB. DIF was exited February 24, 2023 and generally provided coverage until February 24, 2024 on deposits that existed at the exit date. The Company has established a relationship to participate in a reciprocal deposit program with other financial institutions. The reciprocal deposit program provides access to FDIC-insured deposit products in aggregate amounts exceeding the current limits for depositors. At March 31, 2024 and December 31, 2023, total reciprocal deposits were $394.9 million and $209.4 million, respectively, consisting of non-certificate accounts. ​ A summary of certificate accounts by maturity at March 31, 2024 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Average ​ ​ Amount Rate ​ ​ (dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ Within 1 year ​ $ 1,157,083 ​ 4.46 % Over 1 year to 2 years ​ ​ 44,999 ​ 3.30 ​ Over 2 years to 3 years ​ ​ 36,870 ​ 3.96 ​ Over 3 years to 4 years ​ ​ 1,045 ​ 1.75 ​ Over 4 years to 5 years ​ ​ 255 ​ 0.52 ​ Total certificate deposits ​ $ 1,240,252 ​ 4.40 % ​ ​ ​ ​ ​ ​ ​ ​

BORROWINGS

BORROWINGS	3 Months Ended
	Mar. 31, 2024
BORROWINGS
BORROWINGS	8. ​ Borrowed funds at March 31, 2024 consisted of FHLB advances and a BTFP advance, while at December 31, 2023 borrowed funds consisted only of FHLB advances. Short-term advances were $235.0 million and $303.0 million with a weighted average rate of 5.51% and 5.53%, at March 31, 2024 and December 31, 2023, respectively. Long-term borrowings are summarized by maturity date below. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ December 31, 2023 ​ ​ ​ Amount by ​ ​ ​ Weighted ​ Amount by ​ Weighted ​ ​ ​ Scheduled ​ Amount by ​ Average ​ Scheduled ​ Average ​ ​ Maturity* Call Date (1) Rate (2) Maturity* Rate (2) ​ ​ (dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ending December 31: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2024 ​ $ 10,000 ​ $ 190,000 ​ 1.68 % $ — ​ — % 2025 ​ ​ 245,987 ​ ​ 255,987 ​ 4.69 ​ ​ 13,400 ​ 1.39 ​ 2026 ​ ​ 130,000 ​ ​ 40,000 ​ 4.30 ​ ​ 90,987 ​ 4.31 ​ 2027 ​ ​ 50,000 ​ ​ — ​ 4.12 ​ ​ 110,000 ​ 4.20 ​ 2028 ​ ​ 59,198 ​ ​ 19,198 ​ 4.03 ​ ​ 10,000 ​ 3.72 ​ 2029 ​ ​ 23,128 ​ ​ 13,128 ​ 4.06 ​ ​ 40,000 ​ 3.86 ​ 2030 and thereafter ​ ​ 1,067 ​ ​ 1,067 ​ 2.00 ​ ​ 1,075 ​ 2.00 ​ ​ ​ $ 519,380 ​ $ 519,380 ​ 4.37 % $ 265,462 ​ 4.02 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ * Includes an amortizing advance requiring monthly principal and interest payments. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (2) ​ ​ The FHLB advances are secured by a blanket security agreement which requires the Bank to maintain certain qualifying assets as collateral, principally residential mortgage loans and commercial real estate loans held in the Bank’s portfolio. The carrying value of the loans pledged as collateral for these borrowings totaled $2.04 billion at March 31, 2024 and $2.02 billion at December 31, 2023. As of March 31, 2024, the Company had $532.0 million of available borrowing capacity with the FHLB. ​ The Bank maintains a BIC line at the FRBB, with total credit based on eligible collateral. At March 31, 2024, the Bank had $364.0 million of borrowing capacity secured by 59% of the carrying value of commercial loans with principal balances amounting to $363.4 million and securities with a collateral value in the amount of $151.0 million at March 31,2024, with no balance outstanding. At March 31, 2024, the Bank also had a $175.0 million borrowing under the BTFP secured by available-for-sale securities with a par value of $186.7 million. The BTFP ceased making new loans on March 11, 2024. The Company also has additional borrowing capacity under a $25.0 million unsecured federal funds line with a correspondent bank. ​ On December 1, 2023, the Company fully redeemed its Subordinated Notes and expensed the remaining unamortized issuance costs. Amortization of issuance costs was $32,000 for the quarter ended March 31, 2023. ​

OTHER COMMITMENTS AND CONTINGEN

OTHER COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2024
OTHER COMMITMENTS AND CONTINGENCIES
OTHER COMMITMENTS AND CONTINGENCIES	9. OTHER COMMITMENTS AND CONTINGENCIES ​ ACL on Unfunded Commitments ​ The ACL on unfunded commitments amounted to $3.4 million and $5.0 million at March 31, 2024 and 2023, respectively. The activity in the ACL on unfunded commitments for the three months ended March 31, 2024 and 2023 is presented below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ Commercial ​ Commercial ​ Commercial ​ ​ ​ ​ ​ ​ Real Estate ​ Real Estate ​ Construction ​ and Industrial ​ Consumer ​ Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at December 31, 2023 ​ $ 254 ​ $ 411 ​ $ 2,351 ​ $ 882 ​ $ 20 ​ $ 3,918 Provision ​ ​ 4 ​ ​ (51) ​ ​ (421) ​ ​ (37) ​ ​ (1) ​ ​ (506) Balance at March 31, 2024 ​ $ 258 ​ $ 360 ​ $ 1,930 ​ $ 845 ​ $ 19 ​ $ 3,412 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at December 31, 2022 ​ $ 336 ​ $ 628 ​ $ 3,079 ​ $ 870 ​ $ 14 ​ $ 4,927 Provision ​ ​ (74) ​ ​ (80) ​ ​ 198 ​ ​ 70 ​ ​ 5 ​ ​ 119 Balance at March 31, 2023 ​ $ 262 ​ $ 548 ​ $ 3,277 ​ $ 940 ​ $ 19 ​ $ 5,046 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loan Commitments ​ The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and advance funds on various lines of credit. Those commitments involve, to varying degrees, elements of credit and interest-rate risk in excess of the amount recognized in the accompanying unaudited interim Consolidated Financial Statements. ​ The Company’s exposure to credit loss is represented by the contractual amount of these commitments. The Company uses the same credit policies in making commitments as it does for on-balance sheet instruments. ​ The following off-balance sheet financial instruments were outstanding at March 31, 2024 and December 31, 2023. The contract amounts represent credit risk. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ December 31, ​ ​ 2024 ​ 2023 ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ Commitments to grant residential real estate loans-HarborOne Mortgage ​ $ 48,624 ​ $ 35,029 ​ Commitments to grant other loans ​ ​ 39,967 ​ ​ 48,547 ​ Unadvanced funds on home equity lines of credit ​ ​ 264,888 ​ ​ 260,376 ​ Unadvanced funds on revolving lines of credit ​ ​ 283,982 ​ ​ 306,943 ​ Unadvanced funds on construction loans ​ ​ 175,514 ​ ​ 210,829 ​ ​ Commitments to extend credit and unadvanced portions of construction loans are agreements to lend to a customer, as long as there is no violation of any condition established in the contract. Commitments to grant loans generally have fixed expiration dates or other termination clauses and may require payment of a fee. The commitments for unadvanced funds on construction loans and home equity and revolving lines of credit may expire without being drawn upon; therefore, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s credit-worthiness on a case-by-case basis. Commitments to grant loans, and unadvanced construction loans and home equity lines of credit are collateralized by real estate, while revolving lines of credit are unsecured. ​

DERIVATIVES

DERIVATIVES	3 Months Ended
	Mar. 31, 2024
DERIVATIVES
DERIVATIVES	10. DERIVATIVES ​ The Company’s derivative financial instruments are used to manage differences in the amount, timing and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally to manage the Company’s interest-rate risk. Additionally, the Company enters into interest rate derivatives to accommodate the business requirements of its customers. All derivatives are recognized as either assets or liabilities on the balance sheet and are measured at fair value. The accounting for changes in the fair value of a derivative instrument depends upon whether or not it qualifies as a hedge for accounting purposes, and further, by the type of hedging relationship. ​ Derivatives Designated as Hedging Instruments ​ Fair Value Hedge ​ As of March 31, 2024, the Company had two interest rate swap agreements with a notional amount of $100.0 million that were designated as a fair value hedge of fixed-rate residential mortgages. The hedges were determined to be effective during the three months ended March 31, 2024, and the Company expects the hedges to remain effective during the remaining terms of the swaps. The following amounts were recorded on the Consolidated Balance Sheets related to cumulative basis adjustment for fair value hedges as of the dates indicated: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Amount of Fair Value ​ ​ ​ ​ ​ ​ ​ ​ Hedging Adjustment Included in the Line Item in the Consolidated Balance Sheets ​ Carrying Amount of the Hedged ​ Carrying Amount of the Hedged in Which the Hedged Item is Included ​ Assets ​ Assets ​ ​ March 31, ​ December 31, ​ March 31, ​ December 31, ​ ​ 2024 ​ 2023 ​ 2024 ​ 2023 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans held for investment (1) ​ $ 99,464 ​ $ 100,855 ​ $ (536) ​ $ 855 Total ​ $ 99,464 ​ $ 100,855 ​ $ (536) ​ $ 855 ​ ​ (1) ​ ​ Cashflow Hedge ​ As of March 31, 2024, the Company had one interest rate swap agreement with a notional amount of $100.0 million that was designated as a cashflow hedge of brokered deposits. The interest rate swap agreement has an average maturity of 1.02 years, the current weighted average fixed rate paid is 0.67% , the weighted average 3-month SOFR swap receive rate is 5.61% , and the fair value is $4.6 million. The Company expects approximately $4.4 million related to the cashflow hedge to be reclassified to interest expense, from other comprehensive income, in the next twelve months. ​ Derivatives Not Designated as Hedging Instruments ​ Derivative Loan Commitments - Mortgage loan commitments qualify as derivative loan commitments if the loan that will result from exercise of the commitment will be held for sale upon funding. The Company enters into commitments to fund residential mortgage loans at specified times in the future, with the intention that these loans will subsequently be sold in the secondary market. A mortgage loan commitment binds the Company to lend funds to a potential borrower at a specified interest rate and within a specified period of time, generally up to 60 days after inception of the rate lock. ​ Outstanding derivative loan commitments expose the Company to the risk that the price of the loans arising from exercise of the loan commitment might decline from inception of a rate lock to funding of the loan due to increases in mortgage interest rates. If interest rates increase, the value of these loan commitments decreases. Conversely, if interest rates decrease, the value of these loan commitments increases. ​ Forward Loan Sale Commitments ​ With a “mandatory delivery” contract, the Company commits to deliver a certain principal amount of mortgage loans to an investor at a specified price on or before a specified date. If the Company fails to deliver the number of mortgages necessary to fulfill the commitment by the specified date, it is obligated to pay a “pair-off” fee, based on then-current market prices, to the investor to compensate the investor for the shortfall. ​ ​ With a “best efforts” contract, the Company commits to deliver an individual mortgage loan of a specified principal amount and quality to an investor if the loan to the underlying borrower closes. Generally, the price the investor will pay the seller for an individual loan is specified prior to the loan being funded (e.g., on the same day the lender commits to lend funds to a potential borrower). ​ The Company expects that these forward loan sale commitments will experience changes in fair value opposite to the change in fair value of derivative loan commitments. ​ Interest Rate Swaps ​ Interest Rate Futures - ​ Risk Participation Agreements ​ The following table presents the outstanding notional balances and fair values of outstanding derivative instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ Liabilities ​ ​ ​ Notional ​ Fair ​ Fair ​ ​ Amount Value Value ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024: ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value hedge - interest rate swaps ​ $ 100,000 ​ $ 565 ​ $ — ​ Cashflow hedge - interest rate swaps ​ ​ 100,000 ​ ​ 4,579 ​ ​ — ​ Total derivatives designated as hedging instruments ​ ​ ​ ​ $ 5,144 ​ $ — ​ Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative loan commitments ​ $ 34,819 ​ $ 397 ​ $ 18 ​ Forward loan sale commitments ​ ​ 37,000 ​ ​ 52 ​ ​ 32 ​ Interest rate swaps ​ ​ 877,905 ​ ​ 25,365 ​ ​ 25,365 ​ Interest rate futures ​ ​ 32,000 ​ ​ 48 ​ ​ — ​ Risk participation agreements ​ ​ 202,967 ​ ​ — ​ ​ — ​ Total derivatives not designated as hedging instruments ​ ​ ​ ​ $ 25,862 ​ $ 25,415 ​ Total derivatives ​ ​ ​ ​ $ 31,006 ​ $ 25,415 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value hedge - interest rate swaps ​ $ 100,000 ​ ​ — ​ ​ 855 ​ Cashflow hedge - interest rate swaps ​ ​ 100,000 ​ ​ 5,095 ​ ​ — ​ Total derivatives designated as hedging instruments ​ ​ ​ ​ $ 5,095 ​ $ 855 ​ Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative loan commitments ​ $ 30,165 ​ $ 480 ​ $ 158 ​ Forward loan sale commitments ​ ​ 30,000 ​ ​ 4 ​ ​ 293 ​ Interest rate swaps ​ ​ 863,348 ​ ​ 23,245 ​ ​ 23,245 ​ Risk participation agreements ​ ​ 189,275 ​ ​ — ​ ​ — ​ Total derivatives not designated as hedging instruments ​ ​ ​ ​ $ 23,729 ​ $ 23,696 ​ Total derivatives ​ ​ ​ ​ $ 28,824 ​ $ 24,551 ​ ​ ​ The following table presents the recorded net gains and losses pertaining to the Company’s derivative instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Location of gain (loss) ​ ​ ​ ​ ​ ​ ​ ​ recognized in ​ Three Months Ended March 31, ​ ​ Income 2024 ​ 2023 ​ ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives designated as fair value hedge ​ ​ ​ ​ ​ ​ ​ ​ Hedged items - loans ​ Interest income ​ $ (1,429) ​ $ — Interest rate swap contracts ​ Interest income ​ ​ 1,420 ​ ​ — Total ​ ​ ​ $ (9) ​ $ — Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ Derivative loan commitments ​ Mortgage banking income ​ $ 57 ​ $ 558 Forward loan sale commitments ​ Mortgage banking income ​ ​ 310 ​ ​ (477) Interest rate futures ​ Mortgage banking income ​ ​ (221) ​ ​ — Interest rate swaps ​ Other income ​ ​ — ​ ​ — Total ​ ​ ​ $ 146 ​ $ 81 ​ ​ The effect of cashflow hedge accounting on accumulated other comprehensive income is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ ​ ​ 2024 ​ 2023 ​ ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ (Loss) gain in OCI on derivatives (effective portion), net of tax ​ ​ ​ $ (369) ​ $ (854) Gain (loss) reclassified from OCI into interest income or interest expense (effective portion) ​ ​ ​ $ 1,235 ​ $ 1,018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Master netting arrangements provide for a single net settlement of all swap agreements, as well as collateral or cash funds, in the event of default on, or termination of, any one contract. Collateral is provided by cash or securities received or posted by the counterparty with net liability positions, respectively, in accordance with contract thresholds. ​ ​ The following table presents the offsetting of derivatives and amounts subject to an enforceable master netting arrangement, not offset in the Consolidated Balance Sheets at March 31, 2024: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross Amounts Not Offset in the Consolidated Balance Sheets ​ ​ ​ ​ ​ ​ Net Amounts ​ ​ ​ ​ ​ ​ ​ ​ Gross Amounts ​ Gross Amounts ​ Assets (Liabilities) ​ ​ ​ Cash ​ ​ ​ ​ of Recognized ​ Offset in the ​ presented in the ​ ​ ​ Collateral ​ ​ ​ ​ Assets ​ Consolidated ​ Consolidated ​ Financial ​ (Received) ​ Net ​ ​ (Liabilities) Balance Sheets Balance Sheets Instruments Posted Amount ​ ​ (in thousands) Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap on deposits ​ $ 4,579 ​ $ — ​ $ 4,579 ​ $ — ​ $ (4,579) ​ $ — Interest rate swap on residential real estate loans ​ $ 565 ​ $ — ​ $ 565 ​ $ — ​ $ (580) ​ $ (15) Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Customer interest rate swaps ​ $ 24,241 ​ $ — ​ $ 24,241 ​ $ — ​ $ (24,421) ​ $ (180) ​

OPERATING LEASE ROU ASSETS AND

OPERATING LEASE ROU ASSETS AND LIABILITIES	3 Months Ended
	Mar. 31, 2024
OPERATING LEASE ROU ASSETS AND LIABILITIES
OPERATING LEASE ROU ASSETS AND LIABILITIES	11. OPERATING LEASE ROU ASSETS AND LIABILITIES ​ Operating lease ROU assets, included in other assets, were $22.4 million and $22.9 million at March 31, 2024 and December 31, 2023, respectively. ​ Operating lease liabilities, included in other liabilities and accrued expenses , were $24.1 million and $24.5 million at March 31, 2024 and December 31, 2023, respectively. As of March 31, 2024 and December 31, 2023 there were no leases that had not yet commenced. At March 31, 2024, lease expiration dates ranged from one month to 34.4 years and had a weighted average remaining lease term of 16.1 years. At December 31, 2023 , lease expiration dates ranged from two months to 34.7 years and had a weighted average remaining lease term of 16.2 years. ​ Future minimum lease payments under non-cancellable leases as of March 31, 2024 ​ ​ ​ ​ ​ ​ ​ March 31, ​ ​ 2024 ​ ​ (in thousands) ​ ​ ​ ​ 2024 ​ $ 2,754 2025 ​ ​ 2,642 2026 ​ ​ 2,485 2027 ​ ​ 2,416 2028 ​ ​ 2,239 Thereafter ​ ​ 16,588 Total lease payments ​ ​ 29,124 Imputed interest ​ ​ (5,044) Total present value of operating lease liabilities ​ $ 24,080 ​ The weighted-average discount rate and remaining lease term for operating leases were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ ​ December 31, 2023 ​ Weighted-average discount rate ​ ​ 2.09 % ​ 2.08 % Weighted-average remaining lease term (years) ​ ​ 16.10 ​ ​ 16.24 ​ ​ Rental expense for operating leases is recognized on a straight-line basis over the lease term. Variable lease components, such as fair-market value adjustments, are expensed as incurred and not included in ROU assets and operating lease liabilities. ​ The following table presents the components of total lease expense: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ ​ March 31, ​ ​ 2024 ​ 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease Expense: ​ ​ ​ ​ ​ ​ Operating lease expense ​ $ 747 ​ $ 807 Short-term lease expense ​ ​ 26 ​ ​ 30 Variable lease expense ​ ​ 5 ​ ​ 2 Sublease income ​ ​ — ​ ​ (5) Total lease expense ​ $ 778 ​ $ 834 Other Information ​ ​ ​ ​ ​ ​ Cash paid for amounts included in the measurement of lease liabilities- ​ ​ ​ ​ ​ ​ operating cash flows for operating leases ​ ​ 737 ​ ​ 835 Operating Lease - Operating cash flows (Liability reduction) ​ ​ 615 ​ ​ 680 ROU assets obtained in exchange for new operating lease liabilities ​ ​ 38 ​ ​ — ​

MINIMUM REGULATORY CAPITAL REQU

MINIMUM REGULATORY CAPITAL REQUIREMENTS	3 Months Ended
	Mar. 31, 2024
MINIMUM REGULATORY CAPITAL REQUIREMENTS
MINIMUM REGULATORY CAPITAL REQUIREMENTS	12. ​ The Company and the Bank are subject to various regulatory capital requirements administered by the Federal Reserve and the FDIC. Failure to meet minimum capital requirements can result in mandatory and possible additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s unaudited Consolidated Financial Statements. ​ Under the capital rules, risk-based capital ratios are calculated by dividing Tier 1, common equity Tier 1, and total risk-based capital, respectively, by risk-weighted assets. Assets and off-balance sheet credit equivalents are assigned to one of several risk-weight categories, based primarily on relative risk. The rules require banks and bank holding companies to maintain a minimum common equity Tier 1 capital ratio of 4.5%, a minimum Tier 1 capital ratio of 6.0% and a total capital ratio of 8.0%. In addition, a Tier 1 leverage ratio of 4.0% is required. Additionally, the capital rules require a bank holding company to maintain a capital conservation buffer of common equity Tier 1 capital in an amount above the minimum risk-based capital requirements equal to 2.5% of total risk weighted assets, or face restrictions on the ability to pay dividends, pay discretionary bonuses, and to engage in share repurchases. ​ Under the FDIC’s prompt corrective action rules, an insured state nonmember bank is considered “well capitalized” if its capital ratios meet or exceed the ratios as set forth in the following table and is not subject to any written agreement, order, capital directive, or prompt corrective action directive to meet and maintain a specific capital level for any capital measure. The Bank must meet well capitalized requirements under prompt corrective action provisions. Prompt corrective action provisions are not applicable to bank holding companies. ​ A bank holding company is considered “well capitalized” if the bank holding company (i) has a total risk-based capital ratio of at least 10.0%, (ii) has a Tier 1 risk-based capital ratio of at least 6.0%, and (iii) is not subject to any written agreement order, capital directive or prompt corrective action directive to meet and maintain a specific capital level for any capital measure. ​ At March 31, 2024, the capital levels of both the Company and the Bank exceeded all regulatory capital requirements, and their regulatory capital ratios were above the minimum levels required to be considered well capitalized for regulatory purposes. The capital levels of both the Company and the Bank at March 31, 2024 also exceeded the minimum capital requirements, including the currently applicable capital conservation buffer of 2.5%. ​ The Company’s and the Bank’s actual regulatory capital ratios as of March 31, 2024 and December 31, 2023 are presented in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Minimum Required to be ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Considered "Well Capitalized" ​ ​ ​ ​ ​ ​ ​ ​ ​ Minimum Required for ​ ​ Under Prompt Corrective ​ ​ ​ Actual ​ ​ Capital Adequacy Purposes ​ ​ Action Provisions ​ ​ Amount Ratio ​ Amount Ratio ​ Amount Ratio ​ ​ (dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HarborOne Bancorp, Inc. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity Tier 1 capital to risk-weighted assets ​ $ 566,298 ​ 12.0 % ​ $ 212,812 ​ 4.5 % ​ ​ N/A ​ N/A ​ Tier 1 capital to risk-weighted assets ​ ​ 566,298 ​ 12.0 ​ ​ ​ 283,749 ​ 6.0 ​ ​ ​ N/A ​ N/A ​ Total capital to risk-weighted assets ​ ​ 617,896 ​ 13.1 ​ ​ ​ 378,332 ​ 8.0 ​ ​ ​ N/A ​ N/A ​ Tier 1 capital to average assets ​ ​ 566,298 ​ 9.7 ​ ​ ​ 232,397 ​ 4.0 ​ ​ ​ N/A ​ N/A ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity Tier 1 capital to risk-weighted assets ​ $ 567,248 ​ 12.0 % ​ $ 212,816 ​ 4.5 % ​ ​ N/A ​ N/A ​ Tier 1 capital to risk-weighted assets ​ ​ 567,248 ​ 12.0 ​ ​ ​ 283,755 ​ 6.0 ​ ​ ​ N/A ​ N/A ​ Total capital to risk-weighted assets ​ ​ 619,138 ​ 13.1 ​ ​ ​ 378,340 ​ 8.0 ​ ​ ​ N/A ​ N/A ​ Tier 1 capital to average assets ​ ​ 567,248 ​ 10.0 ​ ​ ​ 226,690 ​ 4.0 ​ ​ ​ N/A ​ N/A ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HarborOne Bank ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity Tier 1 capital to risk-weighted assets ​ $ 514,878 ​ 10.9 % ​ $ 212,731 ​ 4.5 % ​ $ 307,278 ​ 6.5 % Tier 1 capital to risk-weighted assets ​ ​ 514,878 ​ 10.9 ​ ​ ​ 283,641 ​ 6.0 ​ ​ ​ 378,188 ​ 8.0 ​ Total capital to risk-weighted assets ​ ​ 566,476 ​ 12.0 ​ ​ ​ 378,188 ​ 8.0 ​ ​ ​ 472,735 ​ 10.0 ​ Tier 1 capital to average assets ​ ​ 514,878 ​ 8.9 ​ ​ ​ 232,374 ​ 4.0 ​ ​ ​ 290,467 ​ 5.0 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity Tier 1 capital to risk-weighted assets ​ $ 509,791 ​ 10.8 % ​ $ 212,724 ​ 4.5 % ​ $ 307,267 ​ 6.5 % Tier 1 capital to risk-weighted assets ​ ​ 509,791 ​ 10.8 ​ ​ ​ 283,632 ​ 6.0 ​ ​ ​ 378,175 ​ 8.0 ​ Total capital to risk-weighted assets ​ ​ 561,682 ​ 11.9 ​ ​ ​ 378,175 ​ 8.0 ​ ​ ​ 472,719 ​ 10.0 ​ Tier 1 capital to average assets ​ ​ 509,791 ​ 9.0 ​ ​ ​ 226,666 ​ 4.0 ​ ​ ​ 283,333 ​ 5.0 ​ ​

COMPREHENSIVE (LOSS) INCOME

COMPREHENSIVE (LOSS) INCOME	3 Months Ended
	Mar. 31, 2024
COMPREHENSIVE (LOSS) INCOME
COMPREHENSIVE (LOSS) INCOME	13. ​ Accounting principles generally require that recognized revenue, expenses, gains and losses be included in net income. Although certain changes in assets and liabilities are reported as a separate component of the stockholders’ equity section of the unaudited Consolidated Balance Sheets, such items, along with net income, are components of comprehensive income (loss). ​ The following table presents changes in accumulated other comprehensive (loss) income by component for the three months ended March 31, 2024 and 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ 2024 ​ ​ 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available ​ Cash ​ ​ ​ ​ ​ Available ​ Cash ​ ​ ​ ​ Postretirement ​ for Sale ​ Flow ​ ​ ​ Postretirement ​ for Sale ​ Flow ​ ​ ​ ​ Benefit ​ Securities ​ Hedge ​ Total ​ Benefit ​ Securities ​ Hedge ​ Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period $ 85 ​ $ (47,373) ​ $ 3,666 ​ $ (43,622) ​ $ 150 ​ $ (53,212) ​ $ 5,980 ​ $ (47,082) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other comprehensive income (loss) before reclassifications ​ ​ (1) ​ ​ (4,940) ​ ​ 718 ​ ​ (4,223) ​ ​ — ​ ​ 7,089 ​ ​ (170) ​ ​ 6,919 Amounts reclassified from accumulated other comprehensive (loss) income ​ ​ (20) ​ ​ — ​ ​ (1,235) ​ ​ (1,255) ​ ​ — ​ ​ — ​ ​ (1,018) ​ ​ (1,018) Net current period other comprehensive (loss) income ​ ​ (21) ​ ​ (4,940) ​ ​ (517) ​ ​ (5,478) ​ ​ — ​ ​ 7,089 ​ ​ (1,188) ​ ​ 5,901 Related tax effect ​ ​ — ​ ​ 348 ​ ​ 148 ​ ​ 496 ​ ​ — ​ ​ (1,563) ​ ​ 334 ​ ​ (1,229) Balance at end of period ​ $ 64 ​ $ (51,965) ​ $ 3,297 ​ $ (48,604) ​ $ 150 ​ $ (47,686) ​ $ 5,126 ​ $ (42,410) ​

FAIR VALUE OF ASSETS AND LIABIL

FAIR VALUE OF ASSETS AND LIABILITIES	3 Months Ended
	Mar. 31, 2024
FAIR VALUE OF ASSETS AND LIABILITIES
FAIR VALUE OF ASSETS AND LIABILITIES	14. ​ Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are three levels of inputs that may be used to measure fair values: ​ •Level 1 – Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. ​ •Level 2 – Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. ​ •Level 3 – Significant unobservable inputs that reflect a company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. ​ The following methods and assumptions were used by the Company in estimating fair value disclosures: ​ Debt Securities ​ Level 2 debt securities are traded less frequently than exchange-traded instruments. The fair value of these securities is determined using matrix pricing with inputs that are observable in the market or can be derived principally from or corroborated by observable market data. This category includes obligations of U.S. government-sponsored enterprises, including mortgage-backed securities, and corporate bonds. ​ Debt securities not actively traded whose fair value is determined through the use of cash flows utilizing inputs that are unobservable are classified as Level 3. There were no Level 3 securities held at March 31, 2024 and December 31, 2023. ​ Loans held for sale ​ Collateral-Dependent Impaired Loans ​ Appraisals for collateral-dependent impaired loans are performed by certified general appraisers (for commercial properties) or certified residential appraisers (for residential properties) whose qualifications and licenses have been reviewed and verified by the Company. Once received, the Company reviews the assumptions and approaches utilized in the appraisal as well as the overall resulting fair value in comparison with independent data sources such as recent market data or industry-wide statistics. ​ Retirement plan annuities ​ MSRs ​ Deposits and mortgagors’ escrow accounts ​ Borrowed funds ​ Accrued interest ​ Derivatives ​ Derivatives designated as hedging instrument ​ Forward loan sale commitments and derivative loan commitments on the Company’s internal cost analysis that is not observable. The weighted average pull-through rate for derivative loan commitments was approximately 91% and 89% at March 31, 2024 and December 31, 2023, respectively. ​ Interest rate swaps and risk participation agreements ​ Although the Company has determined that the majority of the inputs used to value its interest rate swaps and risk participation agreements fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with interest rate contracts and risk participation agreements utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. As of March 31, 2024 and December 31, 2023, the Company assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments were not significant to the overall valuation of its derivatives. As a result, the Company classified its derivative valuations in their entirety as Level 2. ​ Interest rate futures – ​ Off-balance sheet credit-related instruments ​ Transfers between levels are recognized at the end of the reporting period, if applicable. There were no transfers during the periods presented. ​ Assets and Liabilities Measured at Fair Value on a Recurring Basis ​ Assets and liabilities measured at fair value on a recurring basis are summarized below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ ​ Level 1 Level 2 Level 3 Fair Value ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available for sale ​ $ — ​ $ 291,008 ​ $ — ​ $ 291,008 ​ Loans held for sale ​ ​ — ​ ​ 16,434 ​ ​ — ​ ​ 16,434 ​ Mortgage servicing rights ​ ​ — ​ ​ 46,597 ​ ​ — ​ ​ 46,597 ​ Derivatives ​ ​ — ​ ​ 30,557 ​ ​ 449 ​ ​ 31,006 ​ ​ ​ $ — ​ $ 384,596 ​ $ 449 ​ $ 385,045 ​ Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives ​ $ — ​ $ 25,365 ​ $ 50 ​ $ 25,415 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available for sale ​ $ — ​ $ 290,151 ​ $ — ​ $ 290,151 ​ Loans held for sale ​ ​ — ​ ​ 19,686 ​ ​ — ​ ​ 19,686 ​ Mortgage servicing rights ​ ​ — ​ ​ 46,111 ​ ​ — ​ ​ 46,111 ​ Derivatives ​ ​ — ​ ​ 28,340 ​ ​ 484 ​ ​ 28,824 ​ ​ ​ $ — ​ $ 384,288 ​ $ 484 ​ $ 384,772 ​ Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives ​ $ — ​ $ 24,100 ​ $ 451 ​ $ 24,551 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The table below presents, for the three months ended March 31, 2024 and 2023, the changes in Level 3 assets and liabilities that are measured at fair value on a recurring basis. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ 2024 ​ 2023 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ Assets: Derivative and Forward Loan Sale Commitments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 484 ​ $ 487 ​ ​ ​ ​ ​ ​ ​ Total gains (losses) included in net income (1) ​ ​ (35) ​ ​ 279 Balance at end of period ​ $ 449 ​ $ 766 ​ ​ ​ ​ ​ ​ ​ Changes in unrealized gains relating to instruments at period end ​ $ 449 ​ $ 766 ​ ​ ​ ​ ​ ​ ​ Liabilities: Derivative and Forward Loan Sale Commitments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ (451) ​ $ (104) ​ ​ ​ ​ ​ ​ ​ Total gains (losses) included in net income (1) ​ ​ 401 ​ ​ (198) Balance at end of period ​ $ (50) ​ $ (302) ​ ​ ​ ​ ​ ​ ​ Changes in unrealized losses relating to instruments at period end ​ $ (50) ​ $ (302) ​ ​ ​ ​ ​ ​ ​ (1) Included in mortgage banking income on the Consolidated Statements of Income. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets Measured at Fair Value on a Non-recurring Basis ​ The Company is required, on a non-recurring basis, to adjust the carrying value or provide valuation allowances for certain assets using fair value measurements in accordance with GAAP. The following is a summary of applicable non-recurring fair value measurements. There were no assets measured at fair value on a non-recurring basis at March 31, 2024. There are no liabilities measured at fair value on a non-recurring basis at March 31, 2024 or December 31, 2023. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ ​ 2023 ​ ​ Level 1 Level 2 Level 3 ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Collateral-dependent impaired loans ​ ​ $ — ​ $ — ​ $ 5,746 ​ ​ Losses in the following table represent the amount of the fair value adjustments recorded during the period on the carrying value of the assets held at March 31, 2024 and December 31, 2023, respectively. Losses on fully charged off loans are not included in the table. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ 2024 ​ 2023 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Collateral-dependent impaired loans ​ $ — ​ $ 29 ​ The table below presents quantitative information about significant unobservable inputs (Level 3) for assets measured at fair value on a non-recurring basis at the dates indicated. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ Valuation Technique ​ ​ 2023 ​ ​ ​ ​ ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Collateral-dependent impaired loans ​ $ 108 ​ Sales Comparison Approach (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) Fair value is generally determined through independent appraisals of the underlying collateral, which includes unobservable inputs such as adjustments for differences between the comparable sales. The Company may also use another source of collateral assessment to determine a reasonable estimate of the fair value of the collateral. Appraisals may be adjusted by management for qualitative factors and estimated liquidation expenses. Generally, appraisals for residential real estate and commercial real estate loan are discounted 20% . Commercial and industrial appraisals are generally discounted 25% - 50% . Management may take larger discounts to reflect market liquidity for certain types of assets not addressed in the appraisals. ​ ​ Summary of Fair Values of Financial Instruments ​ The estimated fair values, and related carrying or notional amounts, of the Company’s financial instruments are as follows. Certain financial instruments and all nonfinancial instruments are exempt from disclosure requirements. Accordingly, the aggregate fair value amounts presented herein may not necessarily represent the underlying fair value of the Company. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ ​ ​ Carrying ​ Fair Value ​ ​ Amount Level 1 Level 2 Level 3 Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 393,441 ​ $ 393,441 ​ $ — ​ $ — ​ $ 393,441 ​ Securities available for sale ​ ​ 291,008 ​ ​ — ​ ​ 291,008 ​ ​ — ​ ​ 291,008 ​ Securities held to maturity ​ ​ 19,724 ​ ​ — ​ ​ 19,102 ​ ​ — ​ ​ 19,102 ​ Federal Home Loan Bank stock ​ ​ 26,565 ​ ​ N/A ​ ​ N/A ​ ​ N/A ​ ​ N/A ​ Loans held for sale ​ ​ 16,434 ​ ​ — ​ ​ 16,434 ​ ​ — ​ ​ 16,434 ​ Loans, net ​ ​ 4,728,500 ​ ​ — ​ ​ — ​ ​ 4,500,663 ​ ​ 4,500,663 ​ Retirement plan annuities ​ ​ 15,315 ​ ​ — ​ ​ — ​ ​ 15,315 ​ ​ 15,315 ​ Accrued interest receivable ​ ​ 19,470 ​ ​ — ​ ​ 19,470 ​ ​ — ​ ​ 19,470 ​ Derivatives ​ ​ 31,006 ​ ​ — ​ ​ 30,557 ​ ​ 449 ​ ​ 31,006 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposits ​ ​ 4,394,024 ​ ​ — ​ ​ — ​ ​ 4,382,830 ​ ​ 4,382,830 ​ Borrowed funds ​ ​ 754,380 ​ ​ — ​ ​ 751,277 ​ ​ — ​ ​ 751,277 ​ Mortgagors' escrow accounts ​ ​ 10,364 ​ ​ — ​ ​ — ​ ​ 10,364 ​ ​ 10,364 ​ Accrued interest payable ​ ​ 7,302 ​ ​ — ​ ​ 7,302 ​ ​ — ​ ​ 7,302 ​ Derivatives ​ ​ 25,415 ​ ​ — ​ ​ 25,365 ​ ​ 50 ​ ​ 25,415 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ Carrying ​ Fair Value ​ ​ Amount Level 1 Level 2 Level 3 Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 227,350 ​ $ 227,350 ​ $ — ​ $ — ​ $ 227,350 ​ Securities available for sale ​ ​ 290,151 ​ ​ — ​ ​ 290,151 ​ ​ — ​ ​ 290,151 ​ Securities held to maturity ​ ​ 19,796 ​ ​ — ​ ​ 19,262 ​ ​ — ​ ​ 19,262 ​ Federal Home Loan Bank stock ​ ​ 27,098 ​ ​ N/A ​ ​ N/A ​ ​ N/A ​ ​ N/A ​ Loans held for sale ​ ​ 19,686 ​ ​ — ​ ​ 19,686 ​ ​ — ​ ​ 19,686 ​ Loans, net ​ ​ 4,702,339 ​ ​ — ​ ​ — ​ ​ 4,482,448 ​ ​ 4,482,448 ​ Retirement plan annuities ​ ​ 15,170 ​ ​ — ​ ​ — ​ ​ 15,170 ​ ​ 15,170 ​ Accrued interest receivable ​ ​ 18,169 ​ ​ — ​ ​ 18,169 ​ ​ — ​ ​ 18,169 ​ Derivatives ​ ​ 28,824 ​ ​ — ​ ​ 28,340 ​ ​ 484 ​ ​ 28,824 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposits ​ ​ 4,387,409 ​ ​ — ​ ​ — ​ ​ 4,376,269 ​ ​ 4,376,269 ​ Borrowed funds ​ ​ 303,000 ​ ​ — ​ ​ 567,158 ​ ​ — ​ ​ 567,158 ​ Subordinated debt ​ ​ ​ ​ ​ — ​ ​ — ​ ​ — ​ ​ - ​ Mortgagors' escrow accounts ​ ​ 8,872 ​ ​ — ​ ​ — ​ ​ 8,872 ​ ​ 8,872 ​ Accrued interest payable ​ ​ 5,251 ​ ​ — ​ ​ 5,251 ​ ​ — ​ ​ 5,251 ​ Derivatives ​ ​ 24,551 ​ ​ — ​ ​ 24,100 ​ ​ 451 ​ ​ 24,551 ​ ​ ​

EARNINGS PER SHARE

EARNINGS PER SHARE	3 Months Ended
	Mar. 31, 2024
EARNINGS PER SHARE
EARNINGS PER SHARE	15. EARNINGS PER SHARE ​ Basic EPS represents net income attributable to common shareholders divided by the weighted-average number of common shares outstanding during the period. Non-vested restricted shares that are participating securities are included in the computation of basic EPS. Diluted EPS is computed by dividing net income attributable to common shareholders by the weighted-average number of common shares outstanding, plus the effect of potential dilutive common stock equivalents outstanding during the period. At March 31, 2024 and 2023, respectively, potential common shares of 105,836 and 134,155 were considered to be anti-dilutive and excluded from EPS. ​ The following table presents earnings per common share. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ 2024 ​ 2023 ​ ​ ​ ​ ​ ​ ​ Net income available to common stockholders (in thousands) ​ $ 7,300 ​ $ 7,297 ​ ​ ​ ​ ​ ​ ​ Average number of common shares outstanding ​ ​ 45,285,471 ​ ​ 48,434,373 Less: Average unallocated ESOP shares and non-vested restricted shares ​ ​ (3,373,050) ​ ​ (3,577,149) Weighted average number of common shares outstanding used to calculate basic earnings per common share ​ ​ 41,912,421 ​ ​ 44,857,224 Dilutive effect of share-based compensation ​ ​ 214,616 ​ ​ 427,016 Weighted average number of common shares outstanding used to calculate diluted earnings per common share ​ ​ 42,127,037 ​ ​ 45,284,240 ​ ​ ​ ​ ​ ​ ​ Earnings per common share: ​ ​ ​ ​ ​ ​ Basic ​ $ 0.17 ​ $ 0.16 Diluted ​ $ 0.17 ​ $ 0.16 ​ ​ ​

REVENUE RECOGNITION

REVENUE RECOGNITION	3 Months Ended
	Mar. 31, 2024
REVENUE RECOGNITION
REVENUE RECOGNITION	​ ​ 16. REVENUE RECOGNITION ​ Revenue from contracts with customers in the scope of ASC Topic 606 is measured based on the consideration specified in the contract with a customer and excludes amounts collected on behalf of third parties. The Company recognizes revenue from contracts with customers when it satisfies its performance obligations. ​ The Company’s performance obligations are generally satisfied as services are rendered and can either be satisfied at a point in time or over time. Unsatisfied performance obligations at the report date are not material to our Consolidated Financial Statements. ​ In certain cases, other parties are involved with providing services to our customers. If the Company is a principal in the transaction (providing services itself or through a third party on its behalf), revenues are reported based on the gross consideration received from the customer and any related expenses are reported gross in noninterest expense. If the Company is an agent in the transaction (referring to another party to provide services), the Company reports its net fee or commission retained as revenue. ​ The Company recognizes revenue that is transactional in nature and such revenue is earned at a point in time. Revenue that is recognized at a point in time includes card interchange fees (fee income related to debit card transactions), ATM fees, wire transfer fees, overdraft charge fees, and stop-payment and returned check fees. Additionally, revenue is collected from loan fees, such as letters of credit, line renewal fees and application fees. Such revenue is derived from transactional information and is recognized as revenue immediately as the transactions occur or upon providing the service to complete the customer’s transaction. ​ ​ ​

SEGMENT REPORTING

SEGMENT REPORTING	3 Months Ended
	Mar. 31, 2024
SEGMENT REPORTING
SEGMENT REPORTING	17. SEGMENT REPORTING ​ The Company has two reportable segments: HarborOne Bank and HarborOne Mortgage. Revenue from HarborOne Bank consists primarily of interest earned on loans and investment securities and service charges on deposit accounts. Revenue from HarborOne Mortgage comprises interest earned on loans and fees received as a result of the residential mortgage origination, sale and servicing process. ​ The accounting policies of the reportable segments are the same as those described in the summary of significant accounting policies. Segment profit and loss is measured by net income on a legal entity basis. Intercompany transactions are eliminated in consolidation. ​ ​ Information about the reportable segments and reconciliation to the unaudited interim Consolidated Financial Statements at March 31, 2024 and 2023 and for the three months ended March 31, 2024 and 2023 is presented in the tables below. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2024 ​ ​ HarborOne ​ HarborOne ​ ​ ​ ​ Bank Mortgage Consolidated ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net interest and dividend income ​ $ 30,485 ​ $ 80 ​ $ 30,582 Benefit for credit losses ​ ​ (168) ​ ​ — ​ ​ (168) Net interest and dividend income, after benefit for credit losses ​ ​ 30,653 ​ ​ 80 ​ ​ 30,750 Mortgage banking income: ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain on sale of mortgage loans ​ ​ — ​ ​ 2,013 ​ ​ 2,013 Intersegment gain (loss) ​ ​ (236) ​ ​ 308 ​ ​ — Changes in mortgage servicing rights fair value ​ ​ (32) ​ ​ 86 ​ ​ 54 Other ​ ​ 180 ​ ​ 2,097 ​ ​ 2,276 Total mortgage banking income ​ ​ (88) ​ ​ 4,504 ​ ​ 4,343 Other noninterest income ​ ​ 6,391 ​ ​ 10 ​ ​ 6,398 Total noninterest income ​ ​ 6,303 ​ ​ 4,514 ​ ​ 10,741 Noninterest expense ​ ​ 27,407 ​ ​ 4,311 ​ ​ 31,750 Income before income taxes ​ ​ 9,549 ​ ​ 283 ​ ​ 9,741 Provision for income taxes ​ ​ 2,386 ​ ​ 60 ​ ​ 2,441 Net income ​ $ 7,163 ​ $ 223 ​ $ 7,300 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total assets at period end ​ $ 5,867,715 ​ $ 92,719 ​ $ 5,862,222 Goodwill at period end ​ $ 59,042 ​ $ — ​ $ 59,042 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HarborOne ​ HarborOne ​ ​ ​ ​ ​ Bank ​ Mortgage ​ Consolidated ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net interest and dividend income ​ $ 34,562 ​ $ 327 ​ $ 34,398 Provision for credit losses ​ ​ 1,866 ​ ​ — ​ ​ 1,866 Net interest and dividend income, after provision for credit losses ​ ​ 32,696 ​ ​ 327 ​ ​ 32,532 Mortgage banking income: ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain on sale of mortgage loans ​ ​ — ​ ​ 2,224 ​ ​ 2,224 Intersegment (loss) gain ​ ​ (348) ​ ​ 454 ​ ​ — Changes in mortgage servicing rights fair value ​ ​ (136) ​ ​ (1,556) ​ ​ (1,692) Other ​ ​ 201 ​ ​ 2,015 ​ ​ 2,216 Total mortgage banking (loss) income ​ ​ (283) ​ ​ 3,137 ​ ​ 2,748 Other noninterest income ​ ​ 5,942 ​ ​ — ​ ​ 5,942 Total noninterest income ​ ​ 5,659 ​ ​ 3,137 ​ ​ 8,690 Noninterest expense ​ ​ 26,190 ​ ​ 5,322 ​ ​ 31,509 Income(loss) before income taxes ​ ​ 12,165 ​ ​ (1,858) ​ ​ 9,713 Provision(benefit) for income taxes ​ ​ 3,115 ​ ​ (565) ​ ​ 2,416 Net income (loss) ​ $ 9,050 ​ $ (1,293) ​ $ 7,297 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total assets at period end ​ $ 5,583,453 ​ $ 109,090 ​ $ 5,572,858 Goodwill at period end ​ $ 59,042 ​ $ 10,760 ​ $ 69,802 ​

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2024
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation ​ The unaudited interim Consolidated Financial Statements of HarborOne Bancorp, Inc. presented herein have been prepared pursuant to the rules of the SEC for quarterly reports on Form 10-Q and do not include all of the information and note disclosures required by GAAP. In the opinion of management, all adjustments and disclosures considered necessary for the fair presentation of the accompanying unaudited interim Consolidated Financial Statements have been included. Interim results are not necessarily reflective of the results of the entire year. The accompanying unaudited interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements for the years ended December 31, 2023 and 2022 and notes thereto included in the Company’s Annual Report on Form 10-K. ​ The unaudited interim Consolidated Financial Statements include the accounts of the Company; the Company’s subsidiaries, Legion Parkway Company LLC (a security corporation) and HarborOne Bank; and the Bank’s wholly-owned subsidiaries, which consist of HarborOne Mortgage, LLC, HarborOne Security Company, Inc. and a passive investment corporation. The passive investment corporation maintains and manages certain assets of the Bank. The security company was established for the purpose of buying, holding and selling securities on its own behalf. All significant intercompany balances and transactions have been eliminated in consolidation. ​ Certain prior year amounts have been reclassified to conform to the current year financial statement presentation. These changes and reclassifications did not impact previously reported net income or comprehensive income.
Nature of Operations	Nature of Operations ​ The Company provides a variety of financial services to individuals and businesses through its 30 full-service branches in Massachusetts and Rhode Island, and a commercial lending office in each of Boston, Massachusetts and Providence, Rhode Island. HarborOne Mortgage maintains offices in Florida, Maine, Massachusetts, New Hampshire, New Jersey and Rhode Island and originates loans in five additional states. ​ The Company’s primary deposit products are checking, money market, savings, and term certificate of deposit accounts, while its primary lending products are commercial real estate, commercial, residential mortgages, home equity, and consumer loans. The Company also originates, sells and services residential mortgage loans through HarborOne Mortgage.
Risks and Uncertainties	Risks and Uncertainties ​ Macroeconomic trends are mixed as uncertainty remains about the economy and banking industry. ​ Reliance on secondary funding sources could increase the Company’s overall cost of funds and thereby reduce net income. While the Company believes its current sources of liquidity are adequate to fund operations, there is no guarantee they will suffice to meet future liquidity demands. This may necessitate slowing or discontinuing loan growth, capital expenditures, or other investments, or liquidating assets. ​ Additionally, the Company could experience adverse effects on its business, financial condition, results of operations and cash flows if there is severe or prolonged inflation, a recession, or further escalation of the current geopolitical situation. While asset quality continues to point to economic recovery, the Company’s customers could experience similar adverse effects from these uncertainties that would impair their ability to fulfill their financial obligations to the Company resulting in deteriorating credit quality and loan charge-offs. ​
Summary of Significant Accounting Policies and Recently Adopted Accounting Standards Updates	Summary of Significant Accounting Policies and Recently Adopted Accounting Standards Updates ​ Significant accounting policies in effect and disclosed within the Company’s most recent audited Consolidated Financial Statements as of December 31, 2023 remain substantially unchanged. ​ ​

DEBT SECURITIES (Tables)

DEBT SECURITIES (Tables)	3 Months Ended
	Mar. 31, 2024
DEBT SECURITIES
Schedule of securities available for sale and held to maturity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ Allowance ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ for Credit ​ Fair ​ Cost Gains Losses Losses Value ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available for sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ 47,143 ​ $ — ​ $ 7,127 ​ $ — ​ $ 40,016 U.S. government agency and government-sponsored residential mortgage-backed securities ​ ​ 305,548 ​ ​ 9 ​ ​ 59,486 ​ ​ — ​ ​ 246,071 U.S. government-sponsored collateralized mortgage obligations ​ ​ 1,656 ​ ​ — ​ ​ 66 ​ ​ — ​ ​ 1,590 SBA asset-backed securities ​ ​ 1,607 ​ ​ — ​ ​ 90 ​ ​ — ​ ​ 1,517 Corporate bonds ​ ​ 2,000 ​ ​ — ​ ​ 186 ​ ​ — ​ ​ 1,814 Total securities available for sale ​ $ 357,954 ​ $ 9 ​ $ 66,955 ​ $ — ​ $ 291,008 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities held to maturity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ 15,000 ​ $ — ​ $ 477 ​ $ — ​ $ 14,523 SBA asset-backed securities ​ ​ 4,724 ​ ​ — ​ ​ 145 ​ ​ — ​ ​ 4,579 Total securities held to maturity ​ $ 19,724 ​ $ — ​ $ 622 ​ $ — ​ $ 19,102 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ Allowance ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ for Credit ​ Fair ​ ​ Cost Gains Losses Losses ​ Value ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available for sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ 47,143 ​ $ — ​ $ 6,961 ​ $ — ​ $ 40,182 U.S. government agency and government-sponsored residential mortgage-backed securities ​ ​ 300,277 ​ ​ 3 ​ ​ 54,683 ​ ​ — ​ ​ 245,597 U.S. government-sponsored collateralized mortgage obligations ​ ​ 1,852 ​ ​ — ​ ​ 70 ​ ​ — ​ ​ 1,782 SBA asset-backed securities ​ ​ 1,885 ​ ​ — ​ ​ 107 ​ ​ — ​ ​ 1,778 Corporate bonds ​ ​ 1,000 ​ ​ — ​ ​ 188 ​ ​ — ​ ​ 812 Total securities available for sale ​ $ 352,157 ​ $ 3 ​ $ 62,009 ​ $ — ​ $ 290,151 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities held to maturity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ 15,000 ​ $ — ​ $ 438 ​ $ — ​ $ 14,562 SBA asset-backed securities ​ ​ 4,796 ​ ​ — ​ ​ 96 ​ ​ — ​ ​ 4,700 Total securities held to maturity ​ $ 19,796 ​ $ — ​ $ 534 ​ $ — ​ $ 19,262
Schedule of debt securities by contractual maturity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available for Sale ​ Held to Maturity ​ ​ Amortized ​ Fair ​ Amortized ​ Fair ​ Cost Value Cost Value ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ After 1 year through 5 years ​ $ 7,998 ​ $ 7,564 ​ $ 15,000 ​ $ 14,523 After 5 years through 10 years ​ ​ 41,145 ​ ​ 34,266 ​ ​ — ​ ​ — ​ ​ ​ 49,143 ​ ​ 41,830 ​ ​ 15,000 ​ ​ 14,523 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government agency and government-sponsored residential mortgage-backed securities ​ ​ 305,548 ​ ​ 246,071 ​ ​ — ​ ​ — U.S. government-sponsored collateralized mortgage obligations ​ ​ 1,656 ​ ​ 1,590 ​ ​ — ​ ​ — SBA asset-backed securities ​ ​ 1,607 ​ ​ 1,517 ​ ​ 4,724 ​ ​ 4,579 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 357,954 ​ $ 291,008 ​ $ 19,724 ​ $ 19,102 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of securities with continuous losses	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less Than Twelve Months ​ Twelve Months and Over ​ ​ Gross ​ ​ ​ Gross ​ ​ ​ ​ Unrealized ​ Fair ​ Unrealized ​ Fair ​ Losses Value Losses Value ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available for sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ — ​ $ — ​ $ 7,127 ​ $ 40,016 U.S. government agency and government-sponsored residential mortgage-backed securities ​ ​ 47 ​ ​ 9,249 ​ ​ 59,439 ​ ​ 231,934 U.S. government-sponsored collateralized mortgage obligations ​ ​ — ​ ​ — ​ ​ 66 ​ ​ 1,590 SBA asset-backed securities ​ ​ — ​ ​ — ​ ​ 90 ​ ​ 1,517 Corporate bonds ​ ​ — ​ ​ — ​ ​ 186 ​ ​ 814 ​ ​ $ 47 ​ $ 9,249 ​ $ 66,908 ​ $ 275,871 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities held to maturity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ — ​ $ — ​ ​ 477 ​ ​ 14,523 SBA asset-backed securities ​ ​ 145 ​ ​ 4,579 ​ ​ — ​ ​ — ​ ​ $ 145 ​ $ 4,579 ​ $ 477 ​ $ 14,523 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available for sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ — ​ $ — ​ $ 6,961 ​ $ 40,182 U.S. government agency and government-sponsored residential mortgage-backed securities ​ ​ — ​ ​ — ​ ​ 54,683 ​ ​ 240,955 U.S. government-sponsored collateralized mortgage obligations ​ ​ — ​ ​ — ​ ​ 70 ​ ​ 1,782 SBA asset-backed securities ​ ​ — ​ ​ — ​ ​ 107 ​ ​ 1,778 Corporate bonds ​ ​ — ​ ​ — ​ ​ 188 ​ ​ 812 ​ ​ $ — ​ $ — ​ $ 62,009 ​ $ 285,509 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities held to maturity ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government-sponsored enterprise obligations ​ $ — ​ $ — ​ ​ 438 ​ ​ 14,562 SBA asset-backed securities ​ ​ 96 ​ ​ 4,700 ​ ​ — ​ ​ — ​ ​ $ 96 ​ $ 4,700 ​ $ 438 ​ $ 14,562 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

LOANS HELD FOR SALE (Tables)

LOANS HELD FOR SALE (Tables)	3 Months Ended
	Mar. 31, 2024
LOANS HELD FOR SALE
Schedule of fair value and contractual principal balance outstanding of loans held for sale	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ December 31, ​ ​ 2024 2023 ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans held for sale, fair value ​ $ 16,434 ​ $ 19,686 ​ Loans held for sale, contractual principal outstanding ​ ​ 16,125 ​ ​ 19,155 ​ Fair value less unpaid principal balance ​ $ 309 ​ $ 531 ​

LOANS AND ALLOWANCE FOR CREDI_2

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Tables)	3 Months Ended
	Mar. 31, 2024
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Summary of balances of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ December 31, ​ ​ 2024 2023 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate: ​ ​ ​ ​ ​ ​ ​ One- to four-family ​ $ 1,507,959 ​ $ 1,513,554 ​ Second mortgages and equity lines of credit ​ ​ 173,613 ​ ​ 177,135 ​ Residential real estate construction ​ ​ 14,650 ​ ​ 18,132 ​ Total residential real estate loans ​ ​ 1,696,222 ​ ​ 1,708,821 ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial: ​ ​ ​ ​ ​ ​ ​ Commercial real estate ​ ​ 2,355,672 ​ ​ 2,343,675 ​ Commercial construction ​ ​ 234,811 ​ ​ 208,443 ​ Commercial and industrial ​ ​ 471,215 ​ ​ 466,443 ​ Total commercial loans ​ ​ 3,061,698 ​ ​ 3,018,561 ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer loans: ​ ​ ​ ​ ​ ​ ​ Auto ​ ​ 11,888 ​ ​ 13,603 ​ Personal ​ ​ 7,413 ​ ​ 8,433 ​ Total consumer loans ​ ​ 19,301 ​ ​ 22,036 ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans before basis adjustment ​ ​ 4,777,221 ​ ​ 4,749,418 ​ Basis adjustment associated with fair value hedge (1) ​ ​ (536) ​ ​ 893 ​ Total loans ​ ​ 4,776,685 ​ ​ 4,750,311 ​ Allowance for credit losses on loans ​ ​ (48,185) ​ ​ (47,972) ​ Loans, net ​ $ 4,728,500 ​ $ 4,702,339 ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) Note 10 - Derivatives ​
Schedule of activity in allowance for loan losses and allocation of allowance to loan segments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Second Mortgages ​ Residential ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to Four- ​ and Equity ​ Real Estate ​ Commercial ​ Commercial ​ Commercial ​ ​ ​ ​ ​ ​ Family Lines of Credit Construction Real Estate Construction and Industrial Consumer Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at December 31, 2023 ​ $ 12,101 ​ $ 964 ​ $ 418 ​ $ 21,288 ​ $ 4,824 ​ $ 8,107 ​ $ 270 ​ $ 47,972 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ (228) ​ ​ (49) ​ ​ (277) Recoveries ​ ​ — ​ ​ 3 ​ ​ — ​ ​ 100 ​ ​ — ​ ​ 46 ​ ​ 3 ​ ​ 152 Provision ​ ​ (66) ​ ​ (25) ​ ​ (87) ​ ​ (125) ​ ​ 498 ​ ​ 138 ​ ​ 5 ​ ​ 338 Balance at March 31, 2024 ​ $ 12,035 ​ $ 942 ​ $ 331 ​ $ 21,263 ​ $ 5,322 ​ $ 8,063 ​ $ 229 ​ $ 48,185 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Second Mortgages ​ Residential ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to Four- ​ and Equity ​ Real Estate ​ Commercial ​ Commercial ​ Commercial ​ ​ ​ ​ ​ ​ Family Lines of Credit Construction Real Estate Construction and Industrial Consumer Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at December 31, 2022 ​ $ 11,532 ​ $ 924 ​ $ 280 ​ $ 20,357 ​ $ 4,645 ​ $ 7,236 ​ $ 262 ​ $ 45,236 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ (7) ​ ​ (7) ​ ​ (14) Recoveries ​ ​ 1 ​ ​ 7 ​ ​ — ​ ​ 1 ​ ​ — ​ ​ — ​ ​ 16 ​ ​ 25 Provision ​ ​ (25) ​ ​ 36 ​ ​ 475 ​ ​ 584 ​ ​ 412 ​ ​ 255 ​ ​ 10 ​ ​ 1,747 Balance at March 31, 2023 ​ $ 11,508 ​ $ 967 ​ $ 755 ​ $ 20,942 ​ $ 5,057 ​ $ 7,484 ​ $ 281 ​ $ 46,994 ​ ​ ​
Schedule of carrying value of collateral dependent individually analyzed loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ December 31, 2023 ​ ​ ​ ​ ​ Related ​ ​ ​ ​ Related ​ Carrying Value Allowance ​ Carrying Value ​ Allowance ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate ​ $ 1,496 ​ $ 5 ​ $ 7,416 ​ $ 5 Commercial and industrial ​ ​ 1,744 ​ ​ 67 ​ ​ 1,793 ​ ​ 101 Commercial construction ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total Commercial ​ ​ 3,240 ​ ​ 72 ​ ​ 9,209 ​ ​ 106 Residential real estate ​ ​ 8,866 ​ ​ — ​ ​ 8,054 ​ ​ — Total ​ $ 12,106 ​ $ 72 ​ $ 17,263 ​ $ 106
Summary of past due and non-accrual loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 Days ​ ​ ​ ​ ​ ​ ​ 30-59 Days ​ 60-89 Days ​ or More ​ Total ​ Loans on ​ ​ Past Due Past Due Past Due Past Due Non-accrual ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to four-family ​ $ 2,596 ​ $ 682 ​ $ 5,209 ​ $ 8,487 ​ $ 8,158 ​ Second mortgages and equity lines of credit ​ ​ 10 ​ ​ 608 ​ ​ 316 ​ ​ 934 ​ ​ 708 ​ Commercial real estate ​ ​ 850 ​ ​ 641 ​ ​ 5 ​ ​ 1,496 ​ ​ 1,496 ​ Commercial construction ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ Commercial and industrial ​ ​ 66 ​ ​ 603 ​ ​ 1,301 ​ ​ 1,970 ​ ​ 1,744 ​ Consumer: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Auto ​ ​ 66 ​ ​ — ​ ​ 2 ​ ​ 68 ​ ​ 27 ​ Personal ​ ​ 53 ​ ​ 25 ​ ​ 18 ​ ​ 96 ​ ​ 27 ​ Total ​ $ 3,641 ​ $ 2,559 ​ $ 6,851 ​ $ 13,051 ​ $ 12,160 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to four-family ​ $ 4,704 ​ $ 2,413 ​ $ 4,418 ​ $ 11,535 ​ $ 7,785 ​ Second mortgages and equity lines of credit ​ ​ 164 ​ ​ 130 ​ ​ 57 ​ ​ 351 ​ ​ 473 ​ Commercial real estate ​ ​ — ​ ​ — ​ ​ 5,751 ​ ​ 5,751 ​ ​ 7,416 ​ Commercial construction ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ Commercial and industrial ​ ​ 247 ​ ​ 166 ​ ​ 1,332 ​ ​ 1,745 ​ ​ 1,791 ​ Consumer: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Auto ​ ​ 96 ​ ​ 69 ​ ​ 4 ​ ​ 169 ​ ​ 4 ​ Personal ​ ​ 16 ​ ​ 5 ​ ​ 31 ​ ​ 52 ​ ​ 44 ​ Total ​ $ 5,227 ​ $ 2,783 ​ $ 11,593 ​ $ 19,603 ​ $ 17,513 ​
Schedule of loans by risk rating	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ Loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans ​ Converted ​ ​ ​ ​ ​ Term Loans at Amortized Cost by Origination Year ​ Amortized ​ to Term ​ ​ ​ ​ ​ 2024 ​ 2023 ​ 2022 ​ 2021 ​ 2020 ​ Prior ​ Cost ​ Loans ​ Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of March 31, 2024 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 24,559 ​ $ 147,200 ​ $ 826,882 ​ $ 455,253 ​ $ 233,191 ​ $ 614,772 ​ $ — ​ $ — ​ $ 2,301,857 Special mention ​ ​ — ​ ​ 1,600 ​ ​ 18,839 ​ ​ — ​ ​ 4,293 ​ ​ 27,587 ​ ​ — ​ ​ — ​ ​ 52,319 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,496 ​ ​ — ​ ​ — ​ ​ 1,496 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ ​ ​ ​ — ​ ​ — ​ ​ — Total commercial real estate ​ ​ 24,559 ​ ​ 148,800 ​ ​ 845,721 ​ ​ 455,253 ​ ​ 237,484 ​ ​ 643,855 ​ ​ — ​ ​ — ​ ​ 2,355,672 YTD gross charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 11,690 ​ ​ 73,215 ​ ​ 50,703 ​ ​ 92,676 ​ ​ 68,905 ​ ​ 94,486 ​ ​ 76,180 ​ ​ — ​ ​ 467,855 Special mention ​ ​ — ​ ​ — ​ ​ 427 ​ ​ 184 ​ ​ 22 ​ ​ 883 ​ ​ 100 ​ ​ — ​ ​ 1,616 Substandard ​ ​ — ​ ​ — ​ ​ 2 ​ ​ — ​ ​ 50 ​ ​ 390 ​ ​ — ​ ​ — ​ ​ 442 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,253 ​ ​ 49 ​ ​ — ​ ​ 1,302 Total commercial and industrial ​ ​ 11,690 ​ ​ 73,215 ​ ​ 51,132 ​ ​ 92,860 ​ ​ 68,977 ​ ​ 97,012 ​ ​ 76,329 ​ ​ — ​ ​ 471,215 YTD gross charge-offs ​ ​ — ​ ​ — ​ ​ 153 ​ ​ 65 ​ ​ 3 ​ ​ 7 ​ ​ — ​ ​ — ​ ​ 228 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ — ​ ​ 45,676 ​ ​ 110,181 ​ ​ 64,268 ​ ​ — ​ ​ — ​ ​ 721 ​ ​ — ​ ​ 220,846 Special mention ​ ​ — ​ ​ 4,240 ​ ​ 9,725 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 13,965 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total commercial construction ​ ​ — ​ ​ 49,916 ​ ​ 119,906 ​ ​ 64,268 ​ ​ — ​ ​ — ​ ​ 721 ​ ​ — ​ ​ 234,811 YTD gross charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual ​ ​ 12,179 ​ ​ 135,862 ​ ​ 431,542 ​ ​ 471,589 ​ ​ 199,720 ​ ​ 271,197 ​ ​ 163,938 ​ ​ 1,329 ​ ​ 1,687,356 Non-accrual ​ ​ — ​ ​ — ​ ​ 467 ​ ​ 294 ​ ​ 322 ​ ​ 7,363 ​ ​ 412 ​ ​ 8 ​ ​ 8,866 Total residential real estate ​ ​ 12,179 ​ ​ 135,862 ​ ​ 432,009 ​ ​ 471,883 ​ ​ 200,042 ​ ​ 278,560 ​ ​ 164,350 ​ ​ 1,337 ​ ​ 1,696,222 YTD gross charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual ​ ​ 2,349 ​ ​ 5,510 ​ ​ 4,791 ​ ​ 1,912 ​ ​ 803 ​ ​ 2,928 ​ ​ 954 ​ ​ — ​ ​ 19,247 Non-accrual ​ ​ — ​ ​ 4 ​ ​ 12 ​ ​ — ​ ​ 4 ​ ​ 28 ​ ​ 6 ​ ​ — ​ ​ 54 Total Consumer ​ ​ 2,349 ​ ​ 5,514 ​ ​ 4,803 ​ ​ 1,912 ​ ​ 807 ​ ​ 2,956 ​ ​ 960 ​ ​ — ​ ​ 19,301 YTD gross charge-offs ​ ​ — ​ ​ 14 ​ ​ 5 ​ ​ 19 ​ ​ — ​ ​ 11 ​ ​ — ​ ​ — ​ ​ 49 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans before basis adjustment ​ $ 50,777 ​ $ 413,307 ​ $ 1,453,571 ​ $ 1,086,176 ​ $ 507,310 ​ $ 1,022,383 ​ $ 242,360 ​ $ 1,337 ​ $ 4,777,221 Total YTD gross charge-offs ​ $ — ​ $ 14 ​ $ 158 ​ $ 84 ​ $ 3 ​ $ 18 ​ $ — ​ $ — ​ $ 277 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ Loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans ​ Converted ​ ​ ​ ​ ​ Term Loans at Amortized Cost by Origination Year ​ Amortized ​ to Term ​ ​ ​ ​ ​ 2023 ​ 2022 ​ 2021 ​ 2020 ​ 2019 ​ Prior ​ Cost ​ Loans ​ Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 152,047 ​ $ 828,335 ​ $ 455,996 ​ $ 234,585 ​ $ 233,713 ​ $ 405,103 ​ $ — ​ $ — ​ $ 2,309,779 Special mention ​ ​ — ​ ​ 10,971 ​ ​ — ​ ​ 4,300 ​ ​ 8,977 ​ ​ 2,232 ​ ​ — ​ ​ — ​ ​ 26,480 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,670 ​ ​ — ​ ​ — ​ ​ 1,670 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 5,746 ​ ​ — ​ ​ — ​ ​ 5,746 Total commercial real estate ​ ​ 152,047 ​ ​ 839,306 ​ ​ 455,996 ​ ​ 238,885 ​ ​ 242,690 ​ ​ 414,751 ​ ​ — ​ ​ — ​ ​ 2,343,675 YTD gross charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 4,171 ​ ​ — ​ ​ — ​ ​ 4,171 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 73,240 ​ ​ 52,190 ​ ​ 94,570 ​ ​ 70,565 ​ ​ 22,988 ​ ​ 75,493 ​ ​ 74,125 ​ ​ — ​ ​ 463,171 Special mention ​ ​ — ​ ​ 454 ​ ​ 4 ​ ​ 23 ​ ​ 2 ​ ​ 948 ​ ​ 50 ​ ​ — ​ ​ 1,481 Substandard ​ ​ — ​ ​ 52 ​ ​ 8 ​ ​ — ​ ​ — ​ ​ 367 ​ ​ 18 ​ ​ — ​ ​ 445 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,297 ​ ​ 49 ​ ​ — ​ ​ 1,346 Total commercial and industrial ​ ​ 73,240 ​ ​ 52,696 ​ ​ 94,582 ​ ​ 70,588 ​ ​ 22,990 ​ ​ 78,105 ​ ​ 74,242 ​ ​ — ​ ​ 466,443 YTD gross charge-offs ​ ​ 24 ​ ​ 113 ​ ​ 14 ​ ​ 5 ​ ​ 8 ​ ​ 2 ​ ​ — ​ ​ — ​ ​ 166 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 35,181 ​ ​ 109,291 ​ ​ 60,113 ​ ​ 843 ​ ​ — ​ ​ — ​ ​ 425 ​ ​ — ​ ​ 205,853 Special mention ​ ​ — ​ ​ 2,590 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 2,590 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total commercial construction ​ ​ 35,181 ​ ​ 111,881 ​ ​ 60,113 ​ ​ 843 ​ ​ — ​ ​ — ​ ​ 425 ​ ​ — ​ ​ 208,443 YTD gross charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual ​ ​ 138,541 ​ ​ 434,421 ​ ​ 480,010 ​ ​ 202,118 ​ ​ 38,675 ​ ​ 239,185 ​ ​ 166,144 ​ ​ 1,469 ​ ​ 1,700,563 Non-accrual ​ ​ — ​ ​ — ​ ​ — ​ ​ 127 ​ ​ 956 ​ ​ 6,959 ​ ​ 216 ​ ​ — ​ ​ 8,258 Total residential real estate ​ ​ 138,541 ​ ​ 434,421 ​ ​ 480,010 ​ ​ 202,245 ​ ​ 39,631 ​ ​ 246,144 ​ ​ 166,360 ​ ​ 1,469 ​ ​ 1,708,821 YTD gross charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accrual ​ ​ 8,218 ​ ​ 5,366 ​ ​ 2,254 ​ ​ 1,021 ​ ​ 3,135 ​ ​ 963 ​ ​ 1,031 ​ ​ — ​ ​ 21,988 Non-accrual ​ ​ 14 ​ ​ 18 ​ ​ 5 ​ ​ — ​ ​ 2 ​ ​ 4 ​ ​ 5 ​ ​ — ​ ​ 48 Total Consumer ​ ​ 8,232 ​ ​ 5,384 ​ ​ 2,259 ​ ​ 1,021 ​ ​ 3,137 ​ ​ 967 ​ ​ 1,036 ​ ​ — ​ ​ 22,036 YTD gross charge-offs ​ ​ 7 ​ ​ 16 ​ ​ 4 ​ ​ 15 ​ ​ 18 ​ ​ 29 ​ ​ — ​ ​ — ​ ​ 89 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans before basis adjustment ​ $ 407,241 ​ $ 1,443,688 ​ $ 1,092,960 ​ $ 513,582 ​ $ 308,448 ​ $ 739,967 ​ $ 242,063 ​ $ 1,469 ​ $ 4,749,418 Total YTD gross charge-offs ​ $ 31 ​ $ 129 ​ $ 18 ​ $ 20 ​ $ 26 ​ $ 4,202 ​ $ — ​ $ — ​ $ 4,426 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

MORTGAGE LOAN SERVICING (Tables

MORTGAGE LOAN SERVICING (Tables)	3 Months Ended
	Mar. 31, 2024
MORTGAGE LOAN SERVICING
Tabular disclosure of assumptions used in the calculation of fair value of MSR	​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ December 31, ​ ​ 2024 2023 Prepayment speed ​ 7.50 % 7.60 % Discount rate ​ 9.94 ​ 9.81 ​ Default rate ​ 1.88 ​ 2.27 ​
Schedule of summarized changes to mortgage servicing rights	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ 2024 ​ 2023 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ Balance, beginning of period ​ $ 46,111 ​ $ 48,138 Additions ​ ​ 211 ​ ​ 634 Changes in fair value due to: ​ ​ ​ ​ ​ ​ Reductions from loans paid off during the period ​ ​ (353) ​ ​ (371) Changes in valuation inputs or assumptions ​ ​ 628 ​ ​ (1,321) Balance, end of period ​ $ 46,597 ​ $ 47,080

DEPOSITS (Tables)

DEPOSITS (Tables)	3 Months Ended
	Mar. 31, 2024
DEPOSITS
Summary of deposit balances, by type	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ December 31, ​ ​ 2024 2023 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ NOW and demand deposit accounts $ 982,223 ​ $ 965,798 ​ Regular savings and club accounts ​ ​ 1,110,404 ​ ​ 1,265,315 ​ Money market deposit accounts ​ ​ 1,061,145 ​ ​ 966,201 ​ Total non-certificate accounts ​ ​ 3,153,772 ​ ​ 3,197,314 ​ ​ ​ ​ ​ ​ ​ ​ ​ Term certificate accounts greater than $250,000 ​ ​ 219,050 ​ ​ 240,702 ​ Term certificate accounts less than or equal to $250,000 ​ ​ 633,276 ​ ​ 622,755 ​ Brokered deposits ​ ​ 387,926 ​ ​ 326,638 ​ Total certificate accounts ​ ​ 1,240,252 ​ ​ 1,190,095 ​ Total deposits ​ $ 4,394,024 ​ $ 4,387,409 ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary of certificate accounts by maturity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Average ​ ​ Amount Rate ​ ​ (dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ Within 1 year ​ $ 1,157,083 ​ 4.46 % Over 1 year to 2 years ​ ​ 44,999 ​ 3.30 ​ Over 2 years to 3 years ​ ​ 36,870 ​ 3.96 ​ Over 3 years to 4 years ​ ​ 1,045 ​ 1.75 ​ Over 4 years to 5 years ​ ​ 255 ​ 0.52 ​ Total certificate deposits ​ $ 1,240,252 ​ 4.40 % ​ ​ ​ ​ ​ ​ ​ ​

BORROWINGS (Tables)

BORROWINGS (Tables)	3 Months Ended
	Mar. 31, 2024
BORROWINGS
Schedule of borrowed funds by maturity and call date	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ December 31, 2023 ​ ​ ​ Amount by ​ ​ ​ Weighted ​ Amount by ​ Weighted ​ ​ ​ Scheduled ​ Amount by ​ Average ​ Scheduled ​ Average ​ ​ Maturity* Call Date (1) Rate (2) Maturity* Rate (2) ​ ​ (dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ending December 31: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2024 ​ $ 10,000 ​ $ 190,000 ​ 1.68 % $ — ​ — % 2025 ​ ​ 245,987 ​ ​ 255,987 ​ 4.69 ​ ​ 13,400 ​ 1.39 ​ 2026 ​ ​ 130,000 ​ ​ 40,000 ​ 4.30 ​ ​ 90,987 ​ 4.31 ​ 2027 ​ ​ 50,000 ​ ​ — ​ 4.12 ​ ​ 110,000 ​ 4.20 ​ 2028 ​ ​ 59,198 ​ ​ 19,198 ​ 4.03 ​ ​ 10,000 ​ 3.72 ​ 2029 ​ ​ 23,128 ​ ​ 13,128 ​ 4.06 ​ ​ 40,000 ​ 3.86 ​ 2030 and thereafter ​ ​ 1,067 ​ ​ 1,067 ​ 2.00 ​ ​ 1,075 ​ 2.00 ​ ​ ​ $ 519,380 ​ $ 519,380 ​ 4.37 % $ 265,462 ​ 4.02 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ * Includes an amortizing advance requiring monthly principal and interest payments. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (2) ​ ​

OTHER COMMITMENTS AND CONTING_2

OTHER COMMITMENTS AND CONTINGENCIES (Tables)	3 Months Ended
	Mar. 31, 2024
Schedule of financial instruments with off-balance sheet credit risk	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ December 31, ​ ​ 2024 ​ 2023 ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ Commitments to grant residential real estate loans-HarborOne Mortgage ​ $ 48,624 ​ $ 35,029 ​ Commitments to grant other loans ​ ​ 39,967 ​ ​ 48,547 ​ Unadvanced funds on home equity lines of credit ​ ​ 264,888 ​ ​ 260,376 ​ Unadvanced funds on revolving lines of credit ​ ​ 283,982 ​ ​ 306,943 ​ Unadvanced funds on construction loans ​ ​ 175,514 ​ ​ 210,829 ​
Schedule of activity in the ACL on unfunded commitments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Second Mortgages ​ Residential ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to Four- ​ and Equity ​ Real Estate ​ Commercial ​ Commercial ​ Commercial ​ ​ ​ ​ ​ ​ Family Lines of Credit Construction Real Estate Construction and Industrial Consumer Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at December 31, 2023 ​ $ 12,101 ​ $ 964 ​ $ 418 ​ $ 21,288 ​ $ 4,824 ​ $ 8,107 ​ $ 270 ​ $ 47,972 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ (228) ​ ​ (49) ​ ​ (277) Recoveries ​ ​ — ​ ​ 3 ​ ​ — ​ ​ 100 ​ ​ — ​ ​ 46 ​ ​ 3 ​ ​ 152 Provision ​ ​ (66) ​ ​ (25) ​ ​ (87) ​ ​ (125) ​ ​ 498 ​ ​ 138 ​ ​ 5 ​ ​ 338 Balance at March 31, 2024 ​ $ 12,035 ​ $ 942 ​ $ 331 ​ $ 21,263 ​ $ 5,322 ​ $ 8,063 ​ $ 229 ​ $ 48,185 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Second Mortgages ​ Residential ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ One- to Four- ​ and Equity ​ Real Estate ​ Commercial ​ Commercial ​ Commercial ​ ​ ​ ​ ​ ​ Family Lines of Credit Construction Real Estate Construction and Industrial Consumer Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at December 31, 2022 ​ $ 11,532 ​ $ 924 ​ $ 280 ​ $ 20,357 ​ $ 4,645 ​ $ 7,236 ​ $ 262 ​ $ 45,236 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Charge-offs ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ (7) ​ ​ (7) ​ ​ (14) Recoveries ​ ​ 1 ​ ​ 7 ​ ​ — ​ ​ 1 ​ ​ — ​ ​ — ​ ​ 16 ​ ​ 25 Provision ​ ​ (25) ​ ​ 36 ​ ​ 475 ​ ​ 584 ​ ​ 412 ​ ​ 255 ​ ​ 10 ​ ​ 1,747 Balance at March 31, 2023 ​ $ 11,508 ​ $ 967 ​ $ 755 ​ $ 20,942 ​ $ 5,057 ​ $ 7,484 ​ $ 281 ​ $ 46,994 ​ ​ ​
Unfunded Commitment
Schedule of activity in the ACL on unfunded commitments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ Commercial ​ Commercial ​ Commercial ​ ​ ​ ​ ​ ​ Real Estate ​ Real Estate ​ Construction ​ and Industrial ​ Consumer ​ Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at December 31, 2023 ​ $ 254 ​ $ 411 ​ $ 2,351 ​ $ 882 ​ $ 20 ​ $ 3,918 Provision ​ ​ 4 ​ ​ (51) ​ ​ (421) ​ ​ (37) ​ ​ (1) ​ ​ (506) Balance at March 31, 2024 ​ $ 258 ​ $ 360 ​ $ 1,930 ​ $ 845 ​ $ 19 ​ $ 3,412 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at December 31, 2022 ​ $ 336 ​ $ 628 ​ $ 3,079 ​ $ 870 ​ $ 14 ​ $ 4,927 Provision ​ ​ (74) ​ ​ (80) ​ ​ 198 ​ ​ 70 ​ ​ 5 ​ ​ 119 Balance at March 31, 2023 ​ $ 262 ​ $ 548 ​ $ 3,277 ​ $ 940 ​ $ 19 ​ $ 5,046 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

DERIVATIVES (Tables)

DERIVATIVES (Tables)	3 Months Ended
	Mar. 31, 2024
DERIVATIVES
Schedule of amounts recorded on the Consolidated Balance Sheets related to cumulative basis adjustment for fair value hedges	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Amount of Fair Value ​ ​ ​ ​ ​ ​ ​ ​ Hedging Adjustment Included in the Line Item in the Consolidated Balance Sheets ​ Carrying Amount of the Hedged ​ Carrying Amount of the Hedged in Which the Hedged Item is Included ​ Assets ​ Assets ​ ​ March 31, ​ December 31, ​ March 31, ​ December 31, ​ ​ 2024 ​ 2023 ​ 2024 ​ 2023 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans held for investment (1) ​ $ 99,464 ​ $ 100,855 ​ $ (536) ​ $ 855 Total ​ $ 99,464 ​ $ 100,855 ​ $ (536) ​ $ 855 ​ ​ (1)
Schedule of outstanding notional balances and fair values of outstanding derivative instruments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ Liabilities ​ ​ ​ Notional ​ Fair ​ Fair ​ ​ Amount Value Value ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024: ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value hedge - interest rate swaps ​ $ 100,000 ​ $ 565 ​ $ — ​ Cashflow hedge - interest rate swaps ​ ​ 100,000 ​ ​ 4,579 ​ ​ — ​ Total derivatives designated as hedging instruments ​ ​ ​ ​ $ 5,144 ​ $ — ​ Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative loan commitments ​ $ 34,819 ​ $ 397 ​ $ 18 ​ Forward loan sale commitments ​ ​ 37,000 ​ ​ 52 ​ ​ 32 ​ Interest rate swaps ​ ​ 877,905 ​ ​ 25,365 ​ ​ 25,365 ​ Interest rate futures ​ ​ 32,000 ​ ​ 48 ​ ​ — ​ Risk participation agreements ​ ​ 202,967 ​ ​ — ​ ​ — ​ Total derivatives not designated as hedging instruments ​ ​ ​ ​ $ 25,862 ​ $ 25,415 ​ Total derivatives ​ ​ ​ ​ $ 31,006 ​ $ 25,415 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value hedge - interest rate swaps ​ $ 100,000 ​ ​ — ​ ​ 855 ​ Cashflow hedge - interest rate swaps ​ ​ 100,000 ​ ​ 5,095 ​ ​ — ​ Total derivatives designated as hedging instruments ​ ​ ​ ​ $ 5,095 ​ $ 855 ​ Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative loan commitments ​ $ 30,165 ​ $ 480 ​ $ 158 ​ Forward loan sale commitments ​ ​ 30,000 ​ ​ 4 ​ ​ 293 ​ Interest rate swaps ​ ​ 863,348 ​ ​ 23,245 ​ ​ 23,245 ​ Risk participation agreements ​ ​ 189,275 ​ ​ — ​ ​ — ​ Total derivatives not designated as hedging instruments ​ ​ ​ ​ $ 23,729 ​ $ 23,696 ​ Total derivatives ​ ​ ​ ​ $ 28,824 ​ $ 24,551 ​
Schedule of net gains and losses on derivative instruments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Location of gain (loss) ​ ​ ​ ​ ​ ​ ​ ​ recognized in ​ Three Months Ended March 31, ​ ​ Income 2024 ​ 2023 ​ ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives designated as fair value hedge ​ ​ ​ ​ ​ ​ ​ ​ Hedged items - loans ​ Interest income ​ $ (1,429) ​ $ — Interest rate swap contracts ​ Interest income ​ ​ 1,420 ​ ​ — Total ​ ​ ​ $ (9) ​ $ — Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ Derivative loan commitments ​ Mortgage banking income ​ $ 57 ​ $ 558 Forward loan sale commitments ​ Mortgage banking income ​ ​ 310 ​ ​ (477) Interest rate futures ​ Mortgage banking income ​ ​ (221) ​ ​ — Interest rate swaps ​ Other income ​ ​ — ​ ​ — Total ​ ​ ​ $ 146 ​ $ 81
Schedule of effect of cash flow hedge accounting on accumulated other comprehensive income	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ ​ ​ 2024 ​ 2023 ​ ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ (Loss) gain in OCI on derivatives (effective portion), net of tax ​ ​ ​ $ (369) ​ $ (854) Gain (loss) reclassified from OCI into interest income or interest expense (effective portion) ​ ​ ​ $ 1,235 ​ $ 1,018 ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of offsetting of derivative and amounts subject to an enforceable master netting arrangement, not offset in the Consolidated Balance Sheets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross Amounts Not Offset in the Consolidated Balance Sheets ​ ​ ​ ​ ​ ​ Net Amounts ​ ​ ​ ​ ​ ​ ​ ​ Gross Amounts ​ Gross Amounts ​ Assets (Liabilities) ​ ​ ​ Cash ​ ​ ​ ​ of Recognized ​ Offset in the ​ presented in the ​ ​ ​ Collateral ​ ​ ​ ​ Assets ​ Consolidated ​ Consolidated ​ Financial ​ (Received) ​ Net ​ ​ (Liabilities) Balance Sheets Balance Sheets Instruments Posted Amount ​ ​ (in thousands) Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap on deposits ​ $ 4,579 ​ $ — ​ $ 4,579 ​ $ — ​ $ (4,579) ​ $ — Interest rate swap on residential real estate loans ​ $ 565 ​ $ — ​ $ 565 ​ $ — ​ $ (580) ​ $ (15) Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Customer interest rate swaps ​ $ 24,241 ​ $ — ​ $ 24,241 ​ $ — ​ $ (24,421) ​ $ (180) ​

OPERATING LEASE ROU ASSETS AN_2

OPERATING LEASE ROU ASSETS AND LIABILITIES (Tables)	3 Months Ended
	Mar. 31, 2024
OPERATING LEASE ROU ASSETS AND LIABILITIES
Schedule of future minimum lease payments under non-cancellable leases and a reconciliation to the amount recorded as operating lease liabilities	​ ​ ​ ​ ​ ​ ​ March 31, ​ ​ 2024 ​ ​ (in thousands) ​ ​ ​ ​ 2024 ​ $ 2,754 2025 ​ ​ 2,642 2026 ​ ​ 2,485 2027 ​ ​ 2,416 2028 ​ ​ 2,239 Thereafter ​ ​ 16,588 Total lease payments ​ ​ 29,124 Imputed interest ​ ​ (5,044) Total present value of operating lease liabilities ​ $ 24,080
Schedule of weighted-average discount rate and remaining lease term	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ ​ December 31, 2023 ​ Weighted-average discount rate ​ ​ 2.09 % ​ 2.08 % Weighted-average remaining lease term (years) ​ ​ 16.10 ​ ​ 16.24 ​
Schedule of components of total lease expense	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ ​ March 31, ​ ​ 2024 ​ 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease Expense: ​ ​ ​ ​ ​ ​ Operating lease expense ​ $ 747 ​ $ 807 Short-term lease expense ​ ​ 26 ​ ​ 30 Variable lease expense ​ ​ 5 ​ ​ 2 Sublease income ​ ​ — ​ ​ (5) Total lease expense ​ $ 778 ​ $ 834 Other Information ​ ​ ​ ​ ​ ​ Cash paid for amounts included in the measurement of lease liabilities- ​ ​ ​ ​ ​ ​ operating cash flows for operating leases ​ ​ 737 ​ ​ 835 Operating Lease - Operating cash flows (Liability reduction) ​ ​ 615 ​ ​ 680 ROU assets obtained in exchange for new operating lease liabilities ​ ​ 38 ​ ​ — ​

MINIMUM REGULATORY CAPITAL RE_2

MINIMUM REGULATORY CAPITAL REQUIREMENTS (Tables)	3 Months Ended
	Mar. 31, 2024
MINIMUM REGULATORY CAPITAL REQUIREMENTS
Summary of the company's and the bank's actual regulatory capital ratios	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Minimum Required to be ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Considered "Well Capitalized" ​ ​ ​ ​ ​ ​ ​ ​ ​ Minimum Required for ​ ​ Under Prompt Corrective ​ ​ ​ Actual ​ ​ Capital Adequacy Purposes ​ ​ Action Provisions ​ ​ Amount Ratio ​ Amount Ratio ​ Amount Ratio ​ ​ (dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HarborOne Bancorp, Inc. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity Tier 1 capital to risk-weighted assets ​ $ 566,298 ​ 12.0 % ​ $ 212,812 ​ 4.5 % ​ ​ N/A ​ N/A ​ Tier 1 capital to risk-weighted assets ​ ​ 566,298 ​ 12.0 ​ ​ ​ 283,749 ​ 6.0 ​ ​ ​ N/A ​ N/A ​ Total capital to risk-weighted assets ​ ​ 617,896 ​ 13.1 ​ ​ ​ 378,332 ​ 8.0 ​ ​ ​ N/A ​ N/A ​ Tier 1 capital to average assets ​ ​ 566,298 ​ 9.7 ​ ​ ​ 232,397 ​ 4.0 ​ ​ ​ N/A ​ N/A ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity Tier 1 capital to risk-weighted assets ​ $ 567,248 ​ 12.0 % ​ $ 212,816 ​ 4.5 % ​ ​ N/A ​ N/A ​ Tier 1 capital to risk-weighted assets ​ ​ 567,248 ​ 12.0 ​ ​ ​ 283,755 ​ 6.0 ​ ​ ​ N/A ​ N/A ​ Total capital to risk-weighted assets ​ ​ 619,138 ​ 13.1 ​ ​ ​ 378,340 ​ 8.0 ​ ​ ​ N/A ​ N/A ​ Tier 1 capital to average assets ​ ​ 567,248 ​ 10.0 ​ ​ ​ 226,690 ​ 4.0 ​ ​ ​ N/A ​ N/A ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HarborOne Bank ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity Tier 1 capital to risk-weighted assets ​ $ 514,878 ​ 10.9 % ​ $ 212,731 ​ 4.5 % ​ $ 307,278 ​ 6.5 % Tier 1 capital to risk-weighted assets ​ ​ 514,878 ​ 10.9 ​ ​ ​ 283,641 ​ 6.0 ​ ​ ​ 378,188 ​ 8.0 ​ Total capital to risk-weighted assets ​ ​ 566,476 ​ 12.0 ​ ​ ​ 378,188 ​ 8.0 ​ ​ ​ 472,735 ​ 10.0 ​ Tier 1 capital to average assets ​ ​ 514,878 ​ 8.9 ​ ​ ​ 232,374 ​ 4.0 ​ ​ ​ 290,467 ​ 5.0 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity Tier 1 capital to risk-weighted assets ​ $ 509,791 ​ 10.8 % ​ $ 212,724 ​ 4.5 % ​ $ 307,267 ​ 6.5 % Tier 1 capital to risk-weighted assets ​ ​ 509,791 ​ 10.8 ​ ​ ​ 283,632 ​ 6.0 ​ ​ ​ 378,175 ​ 8.0 ​ Total capital to risk-weighted assets ​ ​ 561,682 ​ 11.9 ​ ​ ​ 378,175 ​ 8.0 ​ ​ ​ 472,719 ​ 10.0 ​ Tier 1 capital to average assets ​ ​ 509,791 ​ 9.0 ​ ​ ​ 226,666 ​ 4.0 ​ ​ ​ 283,333 ​ 5.0 ​ ​

COMPREHENSIVE (LOSS) INCOME (Ta

COMPREHENSIVE (LOSS) INCOME (Tables)	3 Months Ended
	Mar. 31, 2024
COMPREHENSIVE (LOSS) INCOME
Schedule of components of accumulated other comprehensive (loss) income	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ 2024 ​ ​ 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available ​ Cash ​ ​ ​ ​ ​ Available ​ Cash ​ ​ ​ ​ Postretirement ​ for Sale ​ Flow ​ ​ ​ Postretirement ​ for Sale ​ Flow ​ ​ ​ ​ Benefit ​ Securities ​ Hedge ​ Total ​ Benefit ​ Securities ​ Hedge ​ Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period $ 85 ​ $ (47,373) ​ $ 3,666 ​ $ (43,622) ​ $ 150 ​ $ (53,212) ​ $ 5,980 ​ $ (47,082) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other comprehensive income (loss) before reclassifications ​ ​ (1) ​ ​ (4,940) ​ ​ 718 ​ ​ (4,223) ​ ​ — ​ ​ 7,089 ​ ​ (170) ​ ​ 6,919 Amounts reclassified from accumulated other comprehensive (loss) income ​ ​ (20) ​ ​ — ​ ​ (1,235) ​ ​ (1,255) ​ ​ — ​ ​ — ​ ​ (1,018) ​ ​ (1,018) Net current period other comprehensive (loss) income ​ ​ (21) ​ ​ (4,940) ​ ​ (517) ​ ​ (5,478) ​ ​ — ​ ​ 7,089 ​ ​ (1,188) ​ ​ 5,901 Related tax effect ​ ​ — ​ ​ 348 ​ ​ 148 ​ ​ 496 ​ ​ — ​ ​ (1,563) ​ ​ 334 ​ ​ (1,229) Balance at end of period ​ $ 64 ​ $ (51,965) ​ $ 3,297 ​ $ (48,604) ​ $ 150 ​ $ (47,686) ​ $ 5,126 ​ $ (42,410) ​

FAIR VALUE OF ASSETS AND LIAB_2

FAIR VALUE OF ASSETS AND LIABILITIES (Tables)	3 Months Ended
	Mar. 31, 2024
FAIR VALUE OF ASSETS AND LIABILITIES
Schedule of assets and liabilities measured at fair value on a recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ ​ Level 1 Level 2 Level 3 Fair Value ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available for sale ​ $ — ​ $ 291,008 ​ $ — ​ $ 291,008 ​ Loans held for sale ​ ​ — ​ ​ 16,434 ​ ​ — ​ ​ 16,434 ​ Mortgage servicing rights ​ ​ — ​ ​ 46,597 ​ ​ — ​ ​ 46,597 ​ Derivatives ​ ​ — ​ ​ 30,557 ​ ​ 449 ​ ​ 31,006 ​ ​ ​ $ — ​ $ 384,596 ​ $ 449 ​ $ 385,045 ​ Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives ​ $ — ​ $ 25,365 ​ $ 50 ​ $ 25,415 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available for sale ​ $ — ​ $ 290,151 ​ $ — ​ $ 290,151 ​ Loans held for sale ​ ​ — ​ ​ 19,686 ​ ​ — ​ ​ 19,686 ​ Mortgage servicing rights ​ ​ — ​ ​ 46,111 ​ ​ — ​ ​ 46,111 ​ Derivatives ​ ​ — ​ ​ 28,340 ​ ​ 484 ​ ​ 28,824 ​ ​ ​ $ — ​ $ 384,288 ​ $ 484 ​ $ 384,772 ​ Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives ​ $ — ​ $ 24,100 ​ $ 451 ​ $ 24,551 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of changes in Level 3 assets measured at fair value on a recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ 2024 ​ 2023 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ Assets: Derivative and Forward Loan Sale Commitments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 484 ​ $ 487 ​ ​ ​ ​ ​ ​ ​ Total gains (losses) included in net income (1) ​ ​ (35) ​ ​ 279 Balance at end of period ​ $ 449 ​ $ 766 ​ ​ ​ ​ ​ ​ ​ Changes in unrealized gains relating to instruments at period end ​ $ 449 ​ $ 766 ​ ​ ​ ​ ​ ​ ​ Liabilities: Derivative and Forward Loan Sale Commitments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ (451) ​ $ (104) ​ ​ ​ ​ ​ ​ ​ Total gains (losses) included in net income (1) ​ ​ 401 ​ ​ (198) Balance at end of period ​ $ (50) ​ $ (302) ​ ​ ​ ​ ​ ​ ​ Changes in unrealized losses relating to instruments at period end ​ $ (50) ​ $ (302) ​ ​ ​ ​ ​ ​ ​ (1) Included in mortgage banking income on the Consolidated Statements of Income. ​ ​ ​ ​ ​ ​
Schedule of changes in Level 3 liabilities measured at fair value on a recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ 2024 ​ 2023 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ Assets: Derivative and Forward Loan Sale Commitments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 484 ​ $ 487 ​ ​ ​ ​ ​ ​ ​ Total gains (losses) included in net income (1) ​ ​ (35) ​ ​ 279 Balance at end of period ​ $ 449 ​ $ 766 ​ ​ ​ ​ ​ ​ ​ Changes in unrealized gains relating to instruments at period end ​ $ 449 ​ $ 766 ​ ​ ​ ​ ​ ​ ​ Liabilities: Derivative and Forward Loan Sale Commitments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ (451) ​ $ (104) ​ ​ ​ ​ ​ ​ ​ Total gains (losses) included in net income (1) ​ ​ 401 ​ ​ (198) Balance at end of period ​ $ (50) ​ $ (302) ​ ​ ​ ​ ​ ​ ​ Changes in unrealized losses relating to instruments at period end ​ $ (50) ​ $ (302) ​ ​ ​ ​ ​ ​ ​ (1) Included in mortgage banking income on the Consolidated Statements of Income. ​ ​ ​ ​ ​ ​
Schedule of assets measured at fair value on a non-recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ ​ 2023 ​ ​ Level 1 Level 2 Level 3 ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Collateral-dependent impaired loans ​ ​ $ — ​ $ — ​ $ 5,746 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ 2024 ​ 2023 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Collateral-dependent impaired loans ​ $ — ​ $ 29
Schedule of changes in Level 3 assets measured at fair value on a non-recurring basis	The table below presents quantitative information about significant unobservable inputs (Level 3) for assets measured at fair value on a non-recurring basis at the dates indicated. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ Valuation Technique ​ ​ 2023 ​ ​ ​ ​ ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Collateral-dependent impaired loans ​ $ 108 ​ Sales Comparison Approach (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) Fair value is generally determined through independent appraisals of the underlying collateral, which includes unobservable inputs such as adjustments for differences between the comparable sales. The Company may also use another source of collateral assessment to determine a reasonable estimate of the fair value of the collateral. Appraisals may be adjusted by management for qualitative factors and estimated liquidation expenses. Generally, appraisals for residential real estate and commercial real estate loan are discounted 20% . Commercial and industrial appraisals are generally discounted 25% - 50% . Management may take larger discounts to reflect market liquidity for certain types of assets not addressed in the appraisals.
Schedule of estimated fair values and related carrying amounts of financial instruments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2024 ​ ​ ​ Carrying ​ Fair Value ​ ​ Amount Level 1 Level 2 Level 3 Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 393,441 ​ $ 393,441 ​ $ — ​ $ — ​ $ 393,441 ​ Securities available for sale ​ ​ 291,008 ​ ​ — ​ ​ 291,008 ​ ​ — ​ ​ 291,008 ​ Securities held to maturity ​ ​ 19,724 ​ ​ — ​ ​ 19,102 ​ ​ — ​ ​ 19,102 ​ Federal Home Loan Bank stock ​ ​ 26,565 ​ ​ N/A ​ ​ N/A ​ ​ N/A ​ ​ N/A ​ Loans held for sale ​ ​ 16,434 ​ ​ — ​ ​ 16,434 ​ ​ — ​ ​ 16,434 ​ Loans, net ​ ​ 4,728,500 ​ ​ — ​ ​ — ​ ​ 4,500,663 ​ ​ 4,500,663 ​ Retirement plan annuities ​ ​ 15,315 ​ ​ — ​ ​ — ​ ​ 15,315 ​ ​ 15,315 ​ Accrued interest receivable ​ ​ 19,470 ​ ​ — ​ ​ 19,470 ​ ​ — ​ ​ 19,470 ​ Derivatives ​ ​ 31,006 ​ ​ — ​ ​ 30,557 ​ ​ 449 ​ ​ 31,006 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposits ​ ​ 4,394,024 ​ ​ — ​ ​ — ​ ​ 4,382,830 ​ ​ 4,382,830 ​ Borrowed funds ​ ​ 754,380 ​ ​ — ​ ​ 751,277 ​ ​ — ​ ​ 751,277 ​ Mortgagors' escrow accounts ​ ​ 10,364 ​ ​ — ​ ​ — ​ ​ 10,364 ​ ​ 10,364 ​ Accrued interest payable ​ ​ 7,302 ​ ​ — ​ ​ 7,302 ​ ​ — ​ ​ 7,302 ​ Derivatives ​ ​ 25,415 ​ ​ — ​ ​ 25,365 ​ ​ 50 ​ ​ 25,415 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ Carrying ​ Fair Value ​ ​ Amount Level 1 Level 2 Level 3 Total ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 227,350 ​ $ 227,350 ​ $ — ​ $ — ​ $ 227,350 ​ Securities available for sale ​ ​ 290,151 ​ ​ — ​ ​ 290,151 ​ ​ — ​ ​ 290,151 ​ Securities held to maturity ​ ​ 19,796 ​ ​ — ​ ​ 19,262 ​ ​ — ​ ​ 19,262 ​ Federal Home Loan Bank stock ​ ​ 27,098 ​ ​ N/A ​ ​ N/A ​ ​ N/A ​ ​ N/A ​ Loans held for sale ​ ​ 19,686 ​ ​ — ​ ​ 19,686 ​ ​ — ​ ​ 19,686 ​ Loans, net ​ ​ 4,702,339 ​ ​ — ​ ​ — ​ ​ 4,482,448 ​ ​ 4,482,448 ​ Retirement plan annuities ​ ​ 15,170 ​ ​ — ​ ​ — ​ ​ 15,170 ​ ​ 15,170 ​ Accrued interest receivable ​ ​ 18,169 ​ ​ — ​ ​ 18,169 ​ ​ — ​ ​ 18,169 ​ Derivatives ​ ​ 28,824 ​ ​ — ​ ​ 28,340 ​ ​ 484 ​ ​ 28,824 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposits ​ ​ 4,387,409 ​ ​ — ​ ​ — ​ ​ 4,376,269 ​ ​ 4,376,269 ​ Borrowed funds ​ ​ 303,000 ​ ​ — ​ ​ 567,158 ​ ​ — ​ ​ 567,158 ​ Subordinated debt ​ ​ ​ ​ ​ — ​ ​ — ​ ​ — ​ ​ - ​ Mortgagors' escrow accounts ​ ​ 8,872 ​ ​ — ​ ​ — ​ ​ 8,872 ​ ​ 8,872 ​ Accrued interest payable ​ ​ 5,251 ​ ​ — ​ ​ 5,251 ​ ​ — ​ ​ 5,251 ​ Derivatives ​ ​ 24,551 ​ ​ — ​ ​ 24,100 ​ ​ 451 ​ ​ 24,551 ​

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 2024
EARNINGS PER SHARE
Schedule of basic and diluted earnings per share	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ 2024 ​ 2023 ​ ​ ​ ​ ​ ​ ​ Net income available to common stockholders (in thousands) ​ $ 7,300 ​ $ 7,297 ​ ​ ​ ​ ​ ​ ​ Average number of common shares outstanding ​ ​ 45,285,471 ​ ​ 48,434,373 Less: Average unallocated ESOP shares and non-vested restricted shares ​ ​ (3,373,050) ​ ​ (3,577,149) Weighted average number of common shares outstanding used to calculate basic earnings per common share ​ ​ 41,912,421 ​ ​ 44,857,224 Dilutive effect of share-based compensation ​ ​ 214,616 ​ ​ 427,016 Weighted average number of common shares outstanding used to calculate diluted earnings per common share ​ ​ 42,127,037 ​ ​ 45,284,240 ​ ​ ​ ​ ​ ​ ​ Earnings per common share: ​ ​ ​ ​ ​ ​ Basic ​ $ 0.17 ​ $ 0.16 Diluted ​ $ 0.17 ​ $ 0.16 ​ ​ ​

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	3 Months Ended
	Mar. 31, 2024
SEGMENT REPORTING
Summary of reportable segments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2024 ​ ​ HarborOne ​ HarborOne ​ ​ ​ ​ Bank Mortgage Consolidated ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net interest and dividend income ​ $ 30,485 ​ $ 80 ​ $ 30,582 Benefit for credit losses ​ ​ (168) ​ ​ — ​ ​ (168) Net interest and dividend income, after benefit for credit losses ​ ​ 30,653 ​ ​ 80 ​ ​ 30,750 Mortgage banking income: ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain on sale of mortgage loans ​ ​ — ​ ​ 2,013 ​ ​ 2,013 Intersegment gain (loss) ​ ​ (236) ​ ​ 308 ​ ​ — Changes in mortgage servicing rights fair value ​ ​ (32) ​ ​ 86 ​ ​ 54 Other ​ ​ 180 ​ ​ 2,097 ​ ​ 2,276 Total mortgage banking income ​ ​ (88) ​ ​ 4,504 ​ ​ 4,343 Other noninterest income ​ ​ 6,391 ​ ​ 10 ​ ​ 6,398 Total noninterest income ​ ​ 6,303 ​ ​ 4,514 ​ ​ 10,741 Noninterest expense ​ ​ 27,407 ​ ​ 4,311 ​ ​ 31,750 Income before income taxes ​ ​ 9,549 ​ ​ 283 ​ ​ 9,741 Provision for income taxes ​ ​ 2,386 ​ ​ 60 ​ ​ 2,441 Net income ​ $ 7,163 ​ $ 223 ​ $ 7,300 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total assets at period end ​ $ 5,867,715 ​ $ 92,719 ​ $ 5,862,222 Goodwill at period end ​ $ 59,042 ​ $ — ​ $ 59,042 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HarborOne ​ HarborOne ​ ​ ​ ​ ​ Bank ​ Mortgage ​ Consolidated ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net interest and dividend income ​ $ 34,562 ​ $ 327 ​ $ 34,398 Provision for credit losses ​ ​ 1,866 ​ ​ — ​ ​ 1,866 Net interest and dividend income, after provision for credit losses ​ ​ 32,696 ​ ​ 327 ​ ​ 32,532 Mortgage banking income: ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain on sale of mortgage loans ​ ​ — ​ ​ 2,224 ​ ​ 2,224 Intersegment (loss) gain ​ ​ (348) ​ ​ 454 ​ ​ — Changes in mortgage servicing rights fair value ​ ​ (136) ​ ​ (1,556) ​ ​ (1,692) Other ​ ​ 201 ​ ​ 2,015 ​ ​ 2,216 Total mortgage banking (loss) income ​ ​ (283) ​ ​ 3,137 ​ ​ 2,748 Other noninterest income ​ ​ 5,942 ​ ​ — ​ ​ 5,942 Total noninterest income ​ ​ 5,659 ​ ​ 3,137 ​ ​ 8,690 Noninterest expense ​ ​ 26,190 ​ ​ 5,322 ​ ​ 31,509 Income(loss) before income taxes ​ ​ 12,165 ​ ​ (1,858) ​ ​ 9,713 Provision(benefit) for income taxes ​ ​ 3,115 ​ ​ (565) ​ ​ 2,416 Net income (loss) ​ $ 9,050 ​ $ (1,293) ​ $ 7,297 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total assets at period end ​ $ 5,583,453 ​ $ 109,090 ​ $ 5,572,858 Goodwill at period end ​ $ 59,042 ​ $ 10,760 ​ $ 69,802 ​

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended
	Mar. 31, 2024 item state
Number of full-service bank offices | item	30
HarborOne Mortgage
Additional states licensed to lend | state	5

DEBT SECURITIES - Summary of se

DEBT SECURITIES - Summary of securities available for sale and held to maturity (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Securities
Accrued interest receivable	$ 959,000	$ 940,000
Securities available for sale, at fair value	291,008,000	290,151,000
Amortized Cost	19,724,000	19,796,000
Securities available for sale
Amortized Cost	357,954,000	352,157,000
Gross Unrealized Gains	9,000	3,000
Gross Unrealized Losses	66,955,000	62,009,000
Allowance for Credit Loss	0
Fair Value	291,008,000	290,151,000
Securities held to maturity
Amortized Cost	19,724,000	19,796,000
Gross Unrealized Losses	622,000	534,000
Fair Value	19,102,000	19,262,000
Asset Pledged as Collateral
Securities
Securities available for sale, at fair value	158,300,000
Securities available for sale
Fair Value	158,300,000
Asset Pledged as Collateral | BTFP borrowing capacity
Securities
Securities available for sale, at fair value	129,400,000
Amortized Cost	14,500,000
Securities available for sale
Fair Value	129,400,000
Securities held to maturity
Amortized Cost	14,500,000
U.S. government and government-sponsored enterprise obligations
Securities
Securities available for sale, at fair value	40,016,000	40,182,000
Amortized Cost	15,000,000	15,000,000
Securities available for sale
Amortized Cost	47,143,000	47,143,000
Gross Unrealized Losses	7,127,000	6,961,000
Fair Value	40,016,000	40,182,000
Securities held to maturity
Amortized Cost	15,000,000	15,000,000
Gross Unrealized Losses	477,000	438,000
Fair Value	14,523,000	14,562,000
U.S. government agency and government-sponsored residential mortgage-backed securities
Securities
Securities available for sale, at fair value	246,071,000	245,597,000
Securities available for sale
Amortized Cost	305,548,000	300,277,000
Gross Unrealized Gains	9,000	3,000
Gross Unrealized Losses	59,486,000	54,683,000
Fair Value	246,071,000	245,597,000
U.S. government-sponsored collateralized mortgage obligations
Securities
Securities available for sale, at fair value	1,590,000	1,782,000
Securities available for sale
Amortized Cost	1,656,000	1,852,000
Gross Unrealized Losses	66,000	70,000
Fair Value	1,590,000	1,782,000
SBA asset-backed securities
Securities
Securities available for sale, at fair value	1,517,000	1,778,000
Amortized Cost	4,724,000	4,796,000
Securities available for sale
Amortized Cost	1,607,000	1,885,000
Gross Unrealized Losses	90,000	107,000
Fair Value	1,517,000	1,778,000
Securities held to maturity
Amortized Cost	4,724,000	4,796,000
Gross Unrealized Losses	145,000	96,000
Fair Value	4,579,000	4,700,000
Corporate bonds
Securities
Securities available for sale, at fair value	1,814,000	812,000
Securities available for sale
Amortized Cost	2,000,000	1,000,000
Gross Unrealized Losses	186,000	188,000
Fair Value	$ 1,814,000	$ 812,000

DEBT SECURITIES - Contractual m

DEBT SECURITIES - Contractual maturity (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) security	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Securities
Gain on sale and call of securities, net	$ 0	$ 0
Fair Value	291,008,000		$ 290,151,000
Fair Value	19,102,000		19,262,000
Allowance for Credit Loss	0
Amortized Cost-Available-for-Sale
After 1 year through 5 years	7,998,000
After 5 years through 10 years	41,145,000
Total for contractual maturity	49,143,000
Total	357,954,000		352,157,000
Fair Value-Available-for-Sale
After 1 year through 5 years	7,564,000
After 5 years through 10 years	34,266,000
Total for contractual maturity	41,830,000
Total	291,008,000		290,151,000
Amortized Cost-Held-to-Maturity
Amortized Cost	19,724,000		19,796,000
After 1 year through 5 years	15,000,000
Total for contractual maturity	15,000,000
Total	19,724,000
Fair Value-Held-to-Maturity
After 1 year through 5 years	14,523,000
Total for contractual maturity	14,523,000
Total	$ 19,102,000		19,262,000
Sales and proceeds
Number of holdings greater than 10% of shareholder equity | security	0
Minimum
Securities
Maturity period	1 year
Maximum
Securities
Maturity period	29 years
Asset Pledged as Collateral
Securities
Fair Value	$ 158,300,000
Fair Value-Available-for-Sale
Total	158,300,000
U.S. government agency and government-sponsored residential mortgage-backed securities
Securities
Fair Value	246,071,000		245,597,000
Amortized Cost-Available-for-Sale
No single maturity date	305,548,000
Total	305,548,000		300,277,000
Fair Value-Available-for-Sale
No single maturity date	246,071,000
Total	246,071,000		245,597,000
U.S. government-sponsored collateralized mortgage obligations
Securities
Fair Value	1,590,000		1,782,000
Amortized Cost-Available-for-Sale
No single maturity date	1,656,000
Total	1,656,000		1,852,000
Fair Value-Available-for-Sale
No single maturity date	1,590,000
Total	1,590,000		1,782,000
SBA asset-backed securities
Securities
Fair Value	1,517,000		1,778,000
Fair Value	4,579,000		4,700,000
Amortized Cost-Available-for-Sale
No single maturity date	1,607,000
Total	1,607,000		1,885,000
Fair Value-Available-for-Sale
No single maturity date	1,517,000
Total	1,517,000		1,778,000
Amortized Cost-Held-to-Maturity
Amortized Cost	4,724,000		4,796,000
No single maturity date	4,724,000
Fair Value-Held-to-Maturity
No single maturity date	4,579,000
Total	4,579,000		4,700,000
U.S. government and government-sponsored enterprise obligations
Securities
Fair Value	40,016,000		40,182,000
Fair Value	14,523,000		14,562,000
Amortized Cost-Available-for-Sale
Total	47,143,000		47,143,000
Fair Value-Available-for-Sale
Total	40,016,000		40,182,000
Amortized Cost-Held-to-Maturity
Amortized Cost	15,000,000		15,000,000
Fair Value-Held-to-Maturity
Total	$ 14,523,000		14,562,000
U.S. government and government-sponsored enterprise obligations | Minimum
Securities
Maturity period	3 years
Callable period	1 month
U.S. government and government-sponsored enterprise obligations | Maximum
Securities
Maturity period	8 years
Callable period	3 years
Corporate bonds
Securities
Fair Value	$ 1,814,000		812,000
Amortized Cost-Available-for-Sale
Total	2,000,000		1,000,000
Fair Value-Available-for-Sale
Total	1,814,000		$ 812,000
U.S. government and government-sponsored enterprise obligations and corporate bonds
Securities
Fair Value	56,400,000
Fair Value-Available-for-Sale
Total	$ 56,400,000

DEBT SECURITIES - Gross unreali

DEBT SECURITIES - Gross unrealized losses aggregated by category (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($)
Marketable Securities [Line Items]
Securities available for sale, gross unrealized losses, less than twelve months	$ 47,000
Securities available for sale, gross unrealized losses, twelve months and over	66,908,000	$ 62,009,000
Securities available for sale, fair value, less than twelve months	9,249,000
Securities available for sale, fair value, twelve months and over	275,871,000	285,509,000
Securities held to maturity, gross unrealized losses, less than twelve months	145,000	96,000
Securities held to maturity, gross unrealized losses, twelve months and over	477,000	438,000
Securities held to maturity, fair value, less than twelve months	4,579,000	4,700,000
Securities held to maturity, fair value, twelve months and over	$ 14,523,000	14,562,000
Number of debt securities | security	136
Number of debt securities in unrealized loss position | security	133
Allowance for credit loss	$ 0
U.S. government and government-sponsored enterprise obligations
Marketable Securities [Line Items]
Securities available for sale, gross unrealized losses, twelve months and over	7,127,000	6,961,000
Securities available for sale, fair value, twelve months and over	40,016,000	40,182,000
Securities held to maturity, gross unrealized losses, twelve months and over	477,000	438,000
Securities held to maturity, fair value, twelve months and over	14,523,000	14,562,000
U.S. government agency and government-sponsored residential mortgage-backed securities
Marketable Securities [Line Items]
Securities available for sale, gross unrealized losses, less than twelve months	47,000
Securities available for sale, gross unrealized losses, twelve months and over	59,439,000	54,683,000
Securities available for sale, fair value, less than twelve months	9,249,000
Securities available for sale, fair value, twelve months and over	231,934,000	240,955,000
U.S. government-sponsored collateralized mortgage obligations
Marketable Securities [Line Items]
Securities available for sale, gross unrealized losses, twelve months and over	66,000	70,000
Securities available for sale, fair value, twelve months and over	1,590,000	1,782,000
SBA asset-backed securities
Marketable Securities [Line Items]
Securities available for sale, gross unrealized losses, twelve months and over	90,000	107,000
Securities available for sale, fair value, twelve months and over	1,517,000	1,778,000
Securities held to maturity, gross unrealized losses, less than twelve months	145,000	96,000
Securities held to maturity, fair value, less than twelve months	4,579,000	4,700,000
Corporate bonds
Marketable Securities [Line Items]
Securities available for sale, gross unrealized losses, twelve months and over	186,000	188,000
Securities available for sale, fair value, twelve months and over	$ 814,000	$ 812,000

LOANS HELD FOR SALE (Details)

LOANS HELD FOR SALE (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Fair value and contractual principal outstanding:
Loans held for sale, fair value	$ 16,434,000		$ 19,686,000
Loans held for sale, contractual principal outstanding	16,125,000		19,155,000
Fair value less unpaid principal balance	309,000	$ 344,000	531,000
Change in fair value of mortgage loans held for sale	(222,000)	$ 8,000
90 Days or More
Fair value and contractual principal outstanding:
Loans held for sale, fair value	$ 0		$ 0

LOANS AND ALLOWANCE FOR CREDI_3

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Balances of Loans (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Loans
Total loans before basis adjustment	$ 4,777,221,000	$ 4,749,418,000
Basis adjustment associated with fair value hedge	(536,000)	893,000
Total loans	4,776,685,000	4,750,311,000
Allowance for credit losses on loans	(48,185,000)	(47,972,000)	$ (46,994,000)	$ (45,236,000)
Net loans	4,728,500,000	4,702,339,000
Net deferred loan costs	8,700,000	8,500,000
PPP loans | Commercial and industrial
Loans
Loans before fees	278,000	321,000
Deferred processing fee income	32,000	36,000
Residential
Loans
Total loans before basis adjustment	1,696,222,000	1,708,821,000
Total loans	1,696,222,000	1,708,821,000
Residential | 1-4 family
Loans
Total loans	1,507,959,000	1,513,554,000
Allowance for credit losses on loans	(12,035,000)	(12,101,000)	(11,508,000)	(11,532,000)
Residential | Second mortgages and equity lines of credit
Loans
Total loans	173,613,000	177,135,000
Allowance for credit losses on loans	(942,000)	(964,000)	(967,000)	(924,000)
Residential | Residential real estate construction
Loans
Total loans	14,650,000	18,132,000
Allowance for credit losses on loans	(331,000)	(418,000)	(755,000)	(280,000)
Commercial
Loans
Total loans	3,061,698,000	3,018,561,000
Commercial | Commercial real estate
Loans
Total loans before basis adjustment	2,355,672,000	2,343,675,000
Total loans	2,355,672,000	2,343,675,000
Allowance for credit losses on loans	(21,263,000)	(21,288,000)	(20,942,000)	(20,357,000)
Commercial | Commercial construction
Loans
Total loans before basis adjustment	234,811,000	208,443,000
Total loans	234,811,000	208,443,000
Allowance for credit losses on loans	(5,322,000)	(4,824,000)	(5,057,000)	(4,645,000)
Commercial | Commercial and industrial
Loans
Total loans before basis adjustment	471,215,000	466,443,000
Total loans	471,215,000	466,443,000
Allowance for credit losses on loans	(8,063,000)	(8,107,000)	(7,484,000)	(7,236,000)
Consumer loans
Loans
Total loans before basis adjustment	19,301,000	22,036,000
Total loans	19,301,000	22,036,000
Allowance for credit losses on loans	(229,000)	(270,000)	$ (281,000)	$ (262,000)
Consumer loans | Auto
Loans
Total loans	11,888,000	13,603,000
Consumer loans | Personal
Loans
Total loans	$ 7,413,000	$ 8,433,000

LOANS AND ALLOWANCE FOR CREDI_4

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Sold or Transferred (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Commercial real estate
Loans
Unpaid principal balance of loans serviced for others	$ 416.1	$ 413

LOANS AND ALLOWANCE FOR CREDI_5

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses Activity (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Activity in the allowance for loan losses and allocation of the allowance to loan segments
Balance	$ 47,972	$ 45,236	$ 45,236
Charge-offs	(277)	(14)	(4,426)
Recoveries	152	25
Provision for loan losses	338	1,747
Balance	48,185	46,994	47,972
Residential | 1-4 family
Activity in the allowance for loan losses and allocation of the allowance to loan segments
Balance	12,101	11,532	11,532
Recoveries		1
Provision for loan losses	(66)	(25)
Balance	12,035	11,508	12,101
Residential | Second mortgages and equity lines of credit
Activity in the allowance for loan losses and allocation of the allowance to loan segments
Balance	964	924	924
Recoveries	3	7
Provision for loan losses	(25)	36
Balance	942	967	964
Residential | Residential real estate construction
Activity in the allowance for loan losses and allocation of the allowance to loan segments
Balance	418	280	280
Provision for loan losses	(87)	475
Balance	331	755	418
Commercial | Commercial real estate
Activity in the allowance for loan losses and allocation of the allowance to loan segments
Balance	21,288	20,357	20,357
Charge-offs			(4,171)
Recoveries	100	1
Provision for loan losses	(125)	584
Balance	21,263	20,942	21,288
Commercial | Commercial construction
Activity in the allowance for loan losses and allocation of the allowance to loan segments
Balance	4,824	4,645	4,645
Provision for loan losses	498	412
Balance	5,322	5,057	4,824
Commercial | Commercial and industrial
Activity in the allowance for loan losses and allocation of the allowance to loan segments
Balance	8,107	7,236	7,236
Charge-offs	(228)	(7)	(166)
Recoveries	46
Provision for loan losses	138	255
Balance	8,063	7,484	8,107
Consumer loans
Activity in the allowance for loan losses and allocation of the allowance to loan segments
Balance	270	262	262
Charge-offs	(49)	(7)	(89)
Recoveries	3	16
Provision for loan losses	5	10
Balance	$ 229	$ 281	$ 270

LOANS AND ALLOWANCE FOR CREDI_6

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Carrying value (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Carrying value	$ 12,200,000	$ 17,500,000
Related Allowance	72,000	108,000
Collateral Dependent
Financing Receivable, Allowance for Credit Losses [Line Items]
Carrying value	12,106,000	17,263,000
Related Allowance	72,000	106,000
Residential | Collateral Dependent
Financing Receivable, Allowance for Credit Losses [Line Items]
Carrying value	8,866,000	8,054,000
Commercial | Collateral Dependent
Financing Receivable, Allowance for Credit Losses [Line Items]
Carrying value	3,240,000	9,209,000
Related Allowance	72,000	106,000
Commercial | Commercial real estate | Collateral Dependent
Financing Receivable, Allowance for Credit Losses [Line Items]
Carrying value	1,496,000	7,416,000
Related Allowance	5,000	5,000
Commercial | Commercial and industrial | Collateral Dependent
Financing Receivable, Allowance for Credit Losses [Line Items]
Carrying value	1,744,000	1,793,000
Related Allowance	$ 67,000	$ 101,000

LOANS AND ALLOWANCE FOR CREDI_7

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Past Due and Non-Accrual Loans (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2023
Summary of past due and non-accrual loans
Total loans	$ 4,776,685	$ 4,750,311
Loans on Non-accrual	12,160	17,513
Loans past due 90 days or more and still accruing	$ 0	0
Borrowers experiencing financial difficulty	0		0
Total Past Due
Summary of past due and non-accrual loans
Total loans	$ 13,051	19,603
30 to 59 Days
Summary of past due and non-accrual loans
Total loans	3,641	5,227
60 to 89 Days
Summary of past due and non-accrual loans
Total loans	2,559	2,783
90 Days or More
Summary of past due and non-accrual loans
Total loans	6,851	11,593
Residential
Summary of past due and non-accrual loans
Total loans	1,696,222	1,708,821
Residential | 1-4 family
Summary of past due and non-accrual loans
Total loans	1,507,959	1,513,554
Loans on Non-accrual	8,158	7,785
Residential | 1-4 family | Total Past Due
Summary of past due and non-accrual loans
Total loans	8,487	11,535
Residential | 1-4 family | 30 to 59 Days
Summary of past due and non-accrual loans
Total loans	2,596	4,704
Residential | 1-4 family | 60 to 89 Days
Summary of past due and non-accrual loans
Total loans	682	2,413
Residential | 1-4 family | 90 Days or More
Summary of past due and non-accrual loans
Total loans	5,209	4,418
Residential | Second mortgages and equity lines of credit
Summary of past due and non-accrual loans
Total loans	173,613	177,135
Loans on Non-accrual	708	473
Residential | Second mortgages and equity lines of credit | Total Past Due
Summary of past due and non-accrual loans
Total loans	934	351
Residential | Second mortgages and equity lines of credit | 30 to 59 Days
Summary of past due and non-accrual loans
Total loans	10	164
Residential | Second mortgages and equity lines of credit | 60 to 89 Days
Summary of past due and non-accrual loans
Total loans	608	130
Residential | Second mortgages and equity lines of credit | 90 Days or More
Summary of past due and non-accrual loans
Total loans	316	57
Commercial
Summary of past due and non-accrual loans
Total loans	3,061,698	3,018,561
Commercial | Commercial real estate
Summary of past due and non-accrual loans
Total loans	2,355,672	2,343,675
Loans on Non-accrual	1,496	7,416
Commercial | Commercial real estate | Total Past Due
Summary of past due and non-accrual loans
Total loans	1,496	5,751
Commercial | Commercial real estate | 30 to 59 Days
Summary of past due and non-accrual loans
Total loans	850
Commercial | Commercial real estate | 60 to 89 Days
Summary of past due and non-accrual loans
Total loans	641
Commercial | Commercial real estate | 90 Days or More
Summary of past due and non-accrual loans
Total loans	5	5,751
Commercial | Commercial construction
Summary of past due and non-accrual loans
Total loans	234,811	208,443
Commercial | Commercial and industrial
Summary of past due and non-accrual loans
Total loans	471,215	466,443
Loans on Non-accrual	1,744	1,791
Commercial | Commercial and industrial | Total Past Due
Summary of past due and non-accrual loans
Total loans	1,970	1,745
Commercial | Commercial and industrial | 30 to 59 Days
Summary of past due and non-accrual loans
Total loans	66	247
Commercial | Commercial and industrial | 60 to 89 Days
Summary of past due and non-accrual loans
Total loans	603	166
Commercial | Commercial and industrial | 90 Days or More
Summary of past due and non-accrual loans
Total loans	1,301	1,332
Consumer loans
Summary of past due and non-accrual loans
Total loans	19,301	22,036
Consumer loans | Auto
Summary of past due and non-accrual loans
Total loans	11,888	13,603
Loans on Non-accrual	27	4
Consumer loans | Auto | Total Past Due
Summary of past due and non-accrual loans
Total loans	68	169
Consumer loans | Auto | 30 to 59 Days
Summary of past due and non-accrual loans
Total loans	66	96
Consumer loans | Auto | 60 to 89 Days
Summary of past due and non-accrual loans
Total loans		69
Consumer loans | Auto | 90 Days or More
Summary of past due and non-accrual loans
Total loans	2	4
Consumer loans | Personal
Summary of past due and non-accrual loans
Total loans	7,413	8,433
Loans on Non-accrual	27	44
Consumer loans | Personal | Total Past Due
Summary of past due and non-accrual loans
Total loans	96	52
Consumer loans | Personal | 30 to 59 Days
Summary of past due and non-accrual loans
Total loans	53	16
Consumer loans | Personal | 60 to 89 Days
Summary of past due and non-accrual loans
Total loans	25	5
Consumer loans | Personal | 90 Days or More
Summary of past due and non-accrual loans
Total loans	$ 18	$ 31

LOANS AND ALLOWANCE FOR CREDI_8

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Risk Rating (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) grade	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Loans by risk rating
Number of grades utilized in internal loan rating system | grade	10
Year one, originated current fiscal year	$ 50,777		$ 407,241
Year two, originated fiscal year before current fiscal year	413,307		1,443,688
Year three, originated two years before current fiscal year	1,453,571		1,092,960
Year four, originated three years before current fiscal year	1,086,176		513,582
Year five, originated four years before current fiscal year	507,310		308,448
Prior	1,022,383		739,967
Revolving Loans Amortized Cost	242,360		242,063
Revolving Loans Converted to Term Loans	1,337		1,469
Total loans before basis adjustment	4,777,221		4,749,418
YTD gross charge-offs, originated current fiscal year			31
YTD gross charge-offs, originated fiscal year before current fiscal year	14		129
YTD gross charge-offs, originated two years before current fiscal year	158		18
YTD gross charge-offs, originated three years before current fiscal year	84		20
YTD gross charge-offs, originated four years before current fiscal year	3		26
YTD gross charge-offs, prior	18		4,202
YTD gross charge-offs	277	$ 14	4,426
Commercial | Commercial real estate
Loans by risk rating
Year one, originated current fiscal year	24,559		152,047
Year two, originated fiscal year before current fiscal year	148,800		839,306
Year three, originated two years before current fiscal year	845,721		455,996
Year four, originated three years before current fiscal year	455,253		238,885
Year five, originated four years before current fiscal year	237,484		242,690
Prior	643,855		414,751
Total loans before basis adjustment	2,355,672		2,343,675
YTD gross charge-offs, prior			4,171
YTD gross charge-offs			4,171
Commercial | Commercial real estate | Pass
Loans by risk rating
Year one, originated current fiscal year	24,559		152,047
Year two, originated fiscal year before current fiscal year	147,200		828,335
Year three, originated two years before current fiscal year	826,882		455,996
Year four, originated three years before current fiscal year	455,253		234,585
Year five, originated four years before current fiscal year	233,191		233,713
Prior	614,772		405,103
Total loans before basis adjustment	2,301,857		2,309,779
Commercial | Commercial real estate | Special mention
Loans by risk rating
Year two, originated fiscal year before current fiscal year	1,600		10,971
Year three, originated two years before current fiscal year	18,839
Year four, originated three years before current fiscal year			4,300
Year five, originated four years before current fiscal year	4,293		8,977
Prior	27,587		2,232
Total loans before basis adjustment	52,319		26,480
Commercial | Commercial real estate | Substandard
Loans by risk rating
Prior	1,496		1,670
Total loans before basis adjustment	1,496		1,670
Commercial | Commercial real estate | Doubtful
Loans by risk rating
Prior			5,746
Total loans before basis adjustment			5,746
Commercial | Commercial construction
Loans by risk rating
Year one, originated current fiscal year			35,181
Year two, originated fiscal year before current fiscal year	49,916		111,881
Year three, originated two years before current fiscal year	119,906		60,113
Year four, originated three years before current fiscal year	64,268		843
Revolving Loans Amortized Cost	721		425
Total loans before basis adjustment	234,811		208,443
Commercial | Commercial construction | Pass
Loans by risk rating
Year one, originated current fiscal year			35,181
Year two, originated fiscal year before current fiscal year	45,676		109,291
Year three, originated two years before current fiscal year	110,181		60,113
Year four, originated three years before current fiscal year	64,268		843
Revolving Loans Amortized Cost	721		425
Total loans before basis adjustment	220,846		205,853
Commercial | Commercial construction | Special mention
Loans by risk rating
Year two, originated fiscal year before current fiscal year	4,240		2,590
Year three, originated two years before current fiscal year	9,725
Total loans before basis adjustment	13,965		2,590
Commercial | Commercial and industrial
Loans by risk rating
Year one, originated current fiscal year	11,690		73,240
Year two, originated fiscal year before current fiscal year	73,215		52,696
Year three, originated two years before current fiscal year	51,132		94,582
Year four, originated three years before current fiscal year	92,860		70,588
Year five, originated four years before current fiscal year	68,977		22,990
Prior	97,012		78,105
Revolving Loans Amortized Cost	76,329		74,242
Total loans before basis adjustment	471,215		466,443
YTD gross charge-offs, originated current fiscal year			24
YTD gross charge-offs, originated fiscal year before current fiscal year			113
YTD gross charge-offs, originated two years before current fiscal year	153		14
YTD gross charge-offs, originated three years before current fiscal year	65		5
YTD gross charge-offs, originated four years before current fiscal year	3		8
YTD gross charge-offs, prior	7		2
YTD gross charge-offs	228	7	166
Commercial | Commercial and industrial | Pass
Loans by risk rating
Year one, originated current fiscal year	11,690		73,240
Year two, originated fiscal year before current fiscal year	73,215		52,190
Year three, originated two years before current fiscal year	50,703		94,570
Year four, originated three years before current fiscal year	92,676		70,565
Year five, originated four years before current fiscal year	68,905		22,988
Prior	94,486		75,493
Revolving Loans Amortized Cost	76,180		74,125
Total loans before basis adjustment	467,855		463,171
Commercial | Commercial and industrial | Special mention
Loans by risk rating
Year two, originated fiscal year before current fiscal year			454
Year three, originated two years before current fiscal year	427		4
Year four, originated three years before current fiscal year	184		23
Year five, originated four years before current fiscal year	22		2
Prior	883		948
Revolving Loans Amortized Cost	100		50
Total loans before basis adjustment	1,616		1,481
Commercial | Commercial and industrial | Substandard
Loans by risk rating
Year two, originated fiscal year before current fiscal year			52
Year three, originated two years before current fiscal year	2		8
Year five, originated four years before current fiscal year	50
Prior	390		367
Revolving Loans Amortized Cost			18
Total loans before basis adjustment	442		445
Commercial | Commercial and industrial | Doubtful
Loans by risk rating
Prior	1,253		1,297
Revolving Loans Amortized Cost	49		49
Total loans before basis adjustment	1,302		1,346
Residential
Loans by risk rating
Year one, originated current fiscal year	12,179		138,541
Year two, originated fiscal year before current fiscal year	135,862		434,421
Year three, originated two years before current fiscal year	432,009		480,010
Year four, originated three years before current fiscal year	471,883		202,245
Year five, originated four years before current fiscal year	200,042		39,631
Prior	278,560		246,144
Revolving Loans Amortized Cost	164,350		166,360
Revolving Loans Converted to Term Loans	1,337		1,469
Total loans before basis adjustment	1,696,222		1,708,821
Residential | Accrual
Loans by risk rating
Year one, originated current fiscal year	12,179		138,541
Year two, originated fiscal year before current fiscal year	135,862		434,421
Year three, originated two years before current fiscal year	431,542		480,010
Year four, originated three years before current fiscal year	471,589		202,118
Year five, originated four years before current fiscal year	199,720		38,675
Prior	271,197		239,185
Revolving Loans Amortized Cost	163,938		166,144
Revolving Loans Converted to Term Loans	1,329		1,469
Total loans before basis adjustment	1,687,356		1,700,563
Residential | Nonaccrual
Loans by risk rating
Year three, originated two years before current fiscal year	467
Year four, originated three years before current fiscal year	294		127
Year five, originated four years before current fiscal year	322		956
Prior	7,363		6,959
Revolving Loans Amortized Cost	412		216
Revolving Loans Converted to Term Loans	8
Total loans before basis adjustment	8,866		8,258
Consumer loans
Loans by risk rating
Year one, originated current fiscal year	2,349		8,232
Year two, originated fiscal year before current fiscal year	5,514		5,384
Year three, originated two years before current fiscal year	4,803		2,259
Year four, originated three years before current fiscal year	1,912		1,021
Year five, originated four years before current fiscal year	807		3,137
Prior	2,956		967
Revolving Loans Amortized Cost	960		1,036
Total loans before basis adjustment	19,301		22,036
YTD gross charge-offs, originated current fiscal year			7
YTD gross charge-offs, originated fiscal year before current fiscal year	14		16
YTD gross charge-offs, originated two years before current fiscal year	5		4
YTD gross charge-offs, originated three years before current fiscal year	19		15
YTD gross charge-offs, originated four years before current fiscal year			18
YTD gross charge-offs, prior	11		29
YTD gross charge-offs	49	$ 7	89
Consumer loans | Accrual
Loans by risk rating
Year one, originated current fiscal year	2,349		8,218
Year two, originated fiscal year before current fiscal year	5,510		5,366
Year three, originated two years before current fiscal year	4,791		2,254
Year four, originated three years before current fiscal year	1,912		1,021
Year five, originated four years before current fiscal year	803		3,135
Prior	2,928		963
Revolving Loans Amortized Cost	954		1,031
Total loans before basis adjustment	19,247		21,988
Consumer loans | Nonaccrual
Loans by risk rating
Year one, originated current fiscal year			14
Year two, originated fiscal year before current fiscal year	4		18
Year three, originated two years before current fiscal year	12		5
Year five, originated four years before current fiscal year	4		2
Prior	28		4
Revolving Loans Amortized Cost	6		5
Total loans before basis adjustment	$ 54		$ 48

MORTGAGE LOAN SERVICING - Key A

MORTGAGE LOAN SERVICING - Key Assumptions (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
MORTGAGE LOAN SERVICING
Unpaid principal balances of mortgage loans serviced	$ 3,520	$ 3,560
Prepayment speed	7.50%	7.60%
Discount rate	9.94%	9.81%
Default rate	1.88%	2.27%

MORTGAGE LOAN SERVICING - Fair

MORTGAGE LOAN SERVICING - Fair value of MSR (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Changes to the fair value of Mortgage Servicing Rights
Balance, beginning of period	$ 46,111	$ 48,138
Additions	211	634
Changes in fair value due to:
Reductions from loans paid off during the period	(353)	(371)
Changes in valuation inputs or assumptions	628	(1,321)
Balance, end of period	46,597	47,080
Fees and commissions, mortgage banking and servicing	$ 2,000	$ 2,000

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
GOODWILL AND INTANGIBLE ASSETS
Goodwill	$ 59,042	$ 59,042	$ 69,802
Goodwill impairment	0
Intangible assets	1,326	$ 1,515
HarborOne Mortgage
GOODWILL AND INTANGIBLE ASSETS
Percentage of goodwill balance		100%
Goodwill impairment		$ 10,800
HarborOne Bank.
GOODWILL AND INTANGIBLE ASSETS
Goodwill	$ 59,000	$ 59,000

DEPOSITS - Summary of deposits

DEPOSITS - Summary of deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
DEPOSITS
NOW and demand deposit accounts	$ 982,223	$ 965,798
Regular savings and club accounts	1,110,404	1,265,315
Money market deposit accounts	1,061,145	966,201
Total non-certificate accounts	3,153,772	3,197,314
Term certificate accounts greater than $250,000	219,050	240,702
Term certificate accounts less than or equal to $250,000	633,276	622,755
Brokered deposits	387,926	326,638
Total certificate accounts	1,240,252	1,190,095
Total deposits	4,394,024	4,387,409
Total municipal deposits	487,000	471,800
Total reciprocal deposits	$ 394,900	$ 209,400

DEPOSITS - Maturity of deposits

DEPOSITS - Maturity of deposits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Summary of certificate accounts by maturity
Within 1 year	$ 1,157,083
Over 1 year to 2 years	44,999
Over 2 years to 3 years	36,870
Over 3 years to 4 years	1,045
Over 4 years to 5 years	255
Total certificate accounts	$ 1,240,252	$ 1,190,095
Summary of certificate accounts by maturity
Within 1 year	4.46%
Over 1 year to 2 years	3.30%
Over 2 years to 3 years	3.96%
Over 3 years to 4 years	1.75%
Over 4 years to 5 years	0.52%
Total certificate deposits	4.40%

BORROWINGS - FHLB Advances (Det

BORROWINGS - FHLB Advances (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) item	Dec. 31, 2023 USD ($)
BORROWINGS
FHLB short-term borrowings	$ 235,000	$ 303,000
Weighted average rate	5.51%	5.53%
Number of callable advances | item	16
Scheduled Maturity
2024	$ 10,000
2025	245,987	$ 13,400
2026	130,000	90,987
2027	50,000	110,000
2028	59,198	10,000
2029	23,128	40,000
2030 and thereafter	1,067	1,075
Total	519,380	$ 265,462
Redeemable at Call Date
2024	190,000
2025	255,987
2026	40,000
2028	19,198
2029	13,128
2030 and thereafter	1,067
Total	$ 519,380
Weighted Average Rate
2024	1.68%
2025	4.69%	1.39%
2026	4.30%	4.31%
2027	4.12%	4.20%
2028	4.03%	3.72%
2029	4.06%	3.86%
2030 and thereafter	2%	2%
Total	4.37%	4.02%

BORROWINGS - Others (Details)

BORROWINGS - Others (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Borrowed funds
FHLB short-term borrowings	$ 235,000,000		$ 303,000,000
Carrying value of the loans pledged as collateral	4,728,500,000		4,702,339,000
Securities available for sale, at fair value	291,008,000		290,151,000
Amortization of issuance costs		$ 32,000
BIC
Borrowed funds
Available borrowing capacity	$ 364,000,000
Federal Reserve Bank of Boston
Borrowed funds
Percentage of carrying value pledged as collateral	59%
Federal Reserve Bank of Boston | BTFP
Borrowed funds
Amount outstanding	$ 175,000,000
Federal Home Loan Bank Advances
Borrowed funds
Available borrowing capacity	532,000,000
Other Loans
Borrowed funds
Additional borrowing capacity	25,000,000
Asset Pledged as Collateral
Borrowed funds
Securities available for sale, at fair value	158,300,000
Asset Pledged as Collateral | Federal Reserve Bank of Boston
Borrowed funds
Carrying value of the loans pledged as collateral	363,400,000
Securities available for sale, at fair value	186,700,000
Asset Pledged as Collateral | Federal Reserve Bank of Boston | BIC
Borrowed funds
Securities available for sale, at fair value	151,000,000
Amount outstanding	0
Asset Pledged as Collateral | Federal Home Loan Bank Advances
Borrowed funds
Carrying value of the loans pledged as collateral	$ 2,040,000,000		$ 2,020,000,000

OTHER COMMITMENTS AND CONTING_3

OTHER COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Commitments to grant residential real estate loans - HarborOne Mortgage
OTHER COMMITMENTS AND CONTINGENCIES
Financial instruments committed contract amount	$ 48,624	$ 35,029
Commitments to grant other loans
OTHER COMMITMENTS AND CONTINGENCIES
Financial instruments committed contract amount	39,967	48,547
Unadvanced funds on home equity lines of credit
OTHER COMMITMENTS AND CONTINGENCIES
Financial instruments committed contract amount	264,888	260,376
Unadvanced funds on revolving lines of credit
OTHER COMMITMENTS AND CONTINGENCIES
Financial instruments committed contract amount	283,982	306,943
Unadvanced funds on construction loans
OTHER COMMITMENTS AND CONTINGENCIES
Financial instruments committed contract amount	$ 175,514	$ 210,829

OTHER COMMITMENTS AND CONTING_4

OTHER COMMITMENTS AND CONTINGENCIES - Unfunded commitments (Details) - Unfunded Commitment - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	$ 3,918	$ 4,927
Provision	(506)	119
Ending balance	3,412	5,046
Residential | Residential Real Estate
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	254	336
Provision	4	(74)
Ending balance	258	262
Commercial | Commercial real estate
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	411	628
Provision	(51)	(80)
Ending balance	360	548
Commercial | Commercial construction
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	2,351	3,079
Provision	(421)	198
Ending balance	1,930	3,277
Commercial | Commercial and industrial
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	882	870
Provision	(37)	70
Ending balance	845	940
Consumer loans
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	20	14
Provision	(1)	5
Ending balance	$ 19	$ 19

DERIVATIVES - Cumulative basis

DERIVATIVES - Cumulative basis adjustment for fair value hedges (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Fair Value Hedging | Designated as hedging instruments
Derivative disclosures
Carrying Amount of the Hedged Assets	$ 99,464,000	$ 100,855,000
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets	$ (536,000)	$ 855,000
Interest rate swaps
Derivative disclosures
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss
Interest rate swaps | Fair Value Hedging | Designated as hedging instruments
Derivative disclosures
Carrying Amount of the Hedged Assets	$ 99,464,000	$ 100,855,000
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets	(536,000)	$ 855,000
Amortized cost	1,200,000,000
Designated amount of hedged items	$ 100,000,000

DERIVATIVES (Details)

DERIVATIVES (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) derivative item	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)
Derivative loan commitments
Derivative disclosures
Loan commitment specified period	60 days
Derivative loan commitments | Not designated as hedging instruments
Derivative disclosures
Notional amount	$ 34,819	$ 30,165
Interest rate swaps | Designated as hedging instruments | Fair value hedge
Derivative disclosures
Notional amount	$ 100,000	100,000	$ 100,000
Number of derivative instruments held | item	2
Interest rate swaps | Designated as hedging instruments | Cashflow hedge
Derivative disclosures
Notional amount	$ 100,000	100,000
Number of derivative instruments held | derivative	1
Maturity term	1 year 7 days
Fixed rate	0.67%
Variable rate	5.61%
Fair value assets	$ 4,600
Amount to be reclassified in next 12 months	4,400
Interest rate swaps | Not designated as hedging instruments
Derivative disclosures
Notional amount	$ 877,905	$ 863,348

DERIVATIVES - Outstanding notio

DERIVATIVES - Outstanding notional balances and fair values of outstanding derivative instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023
Other assets
Derivative disclosures
Fair Value, Assets	$ 31,006	$ 28,824
Other liabilities
Derivative disclosures
Fair Value, Liabilities	25,415	24,551
Designated as hedging instruments | Other assets
Derivative disclosures
Fair Value, Assets	5,144	5,095
Designated as hedging instruments | Other liabilities
Derivative disclosures
Fair Value, Liabilities		855
Not designated as hedging instruments | Other assets
Derivative disclosures
Fair Value, Assets	25,862	23,729
Not designated as hedging instruments | Other liabilities
Derivative disclosures
Fair Value, Liabilities	25,415	23,696
Derivative loan commitments | Not designated as hedging instruments
Derivative disclosures
Notional Amount	34,819	30,165
Derivative loan commitments | Not designated as hedging instruments | Other assets
Derivative disclosures
Fair Value, Assets	397	480
Derivative loan commitments | Not designated as hedging instruments | Other liabilities
Derivative disclosures
Fair Value, Liabilities	18	158
Forward loan sale commitments | Not designated as hedging instruments
Derivative disclosures
Notional Amount	37,000	30,000
Forward loan sale commitments | Not designated as hedging instruments | Other assets
Derivative disclosures
Fair Value, Assets	52	4
Forward loan sale commitments | Not designated as hedging instruments | Other liabilities
Derivative disclosures
Fair Value, Liabilities	32	293
Interest rate swaps | Designated as hedging instruments | Fair value hedge
Derivative disclosures
Notional Amount	100,000	100,000	$ 100,000
Interest rate swaps | Designated as hedging instruments | Cashflow hedge
Derivative disclosures
Notional Amount	100,000	100,000
Fair Value, Assets	4,600
Interest rate swaps | Designated as hedging instruments | Other assets | Fair value hedge
Derivative disclosures
Fair Value, Assets	565
Interest rate swaps | Designated as hedging instruments | Other assets | Cashflow hedge
Derivative disclosures
Fair Value, Assets	4,579	5,095
Interest rate swaps | Designated as hedging instruments | Other liabilities | Fair value hedge
Derivative disclosures
Fair Value, Liabilities		855
Interest rate swaps | Not designated as hedging instruments
Derivative disclosures
Notional Amount	877,905	863,348
Interest rate swaps | Not designated as hedging instruments | Other assets
Derivative disclosures
Fair Value, Assets	25,365	23,245
Interest rate swaps | Not designated as hedging instruments | Other liabilities
Derivative disclosures
Fair Value, Liabilities	25,365	23,245
Interest rate futures | Not designated as hedging instruments
Derivative disclosures
Notional Amount	32,000
Interest rate futures | Not designated as hedging instruments | Other assets
Derivative disclosures
Fair Value, Assets	48
Risk participation agreements | Not designated as hedging instruments
Derivative disclosures
Notional Amount	$ 202,967	$ 189,275

DERIVATIVES - Net gain and loss

DERIVATIVES - Net gain and losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative [Line Items]
(Loss) gain in OCI on derivatives (effective portion), net of tax	$ (4,982)	$ 4,672
Designated as hedging instruments
Derivative [Line Items]
(Loss) gain in OCI on derivatives (effective portion), net of tax	(369)	(854)
Gain (loss) reclassified from OCI into interest income or interest expense (effective portion)	1,235	$ 1,018
Total	(9)
Designated as hedging instruments | Derivative loan commitments
Derivative [Line Items]
Total	$ (1,429)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest and Dividend Income, Operating	Interest and Dividend Income, Operating
Designated as hedging instruments | Interest rate swaps
Derivative [Line Items]
Total	$ 1,420
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest and Dividend Income, Operating	Interest and Dividend Income, Operating
Not designated as hedging instruments
Derivative [Line Items]
Total	$ 146	$ 81
Not designated as hedging instruments | Derivative loan commitments
Derivative [Line Items]
Total	$ 57	$ 558
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Mortgage Banking Noninterest Income	Mortgage Banking Noninterest Income
Not designated as hedging instruments | Forward loan sale commitments
Derivative [Line Items]
Total	$ 310	$ (477)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Mortgage Banking Noninterest Income	Mortgage Banking Noninterest Income
Not designated as hedging instruments | Interest rate futures
Derivative [Line Items]
Total	$ (221)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Mortgage Banking Noninterest Income	Mortgage Banking Noninterest Income
Not designated as hedging instruments | Interest rate swaps
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other Operating Income	Noninterest Income, Other Operating Income

DERIVATIVES - Offsetting (Detai

DERIVATIVES - Offsetting (Details) - Interest rate swaps $ in Thousands	Mar. 31, 2024 USD ($)
Designated as hedging instruments | Deposits
Derivative disclosures
Gross Amounts of Recognized Assets (Liabilities)	$ 4,579
Net Amounts Assets (Liabilities) presented in the Consolidated Balance Sheets	4,579
Cash Collateral (Received) Posted	(4,579)
Designated as hedging instruments | Residential real estate loans
Derivative disclosures
Gross Amounts of Recognized Assets (Liabilities)	565
Net Amounts Assets (Liabilities) presented in the Consolidated Balance Sheets	565
Cash Collateral (Received) Posted	(580)
Net Amount	(15)
Not designated as hedging instruments
Derivative disclosures
Gross Amounts of Recognized Assets (Liabilities)	24,241
Net Amounts Assets (Liabilities) presented in the Consolidated Balance Sheets	24,241
Cash Collateral (Received) Posted	(24,421)
Net Amount	$ (180)

OPERATING LEASE ROU ASSETS AN_3

OPERATING LEASE ROU ASSETS AND LIABILITIES (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Operating lease ROU assets	$ 22,400,000	$ 22,900,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets.	Other Assets.
Operating lease liabilities	$ 24,080,000	$ 24,500,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]	hone:OtherLiabilitiesAndAccruedExpensesMember	hone:OtherLiabilitiesAndAccruedExpensesMember
Operating lease not yet commenced	$ 0	$ 0
Weighted-average remaining lease term (years)	16 years 1 month 6 days	16 years 2 months 27 days
Minimum
Lease expiration	1 month	2 months
Maximum
Lease expiration	34 years 4 months 24 days	34 years 8 months 12 days

OPERATING LEASE ROU ASSETS AN_4

OPERATING LEASE ROU ASSETS AND LIABILITIES - Maturities Due (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2024	$ 2,754
2025	2,642
2026	2,485
2027	2,416
2028	2,239
Thereafter	16,588
Total lease payments	29,124
Imputed interest	(5,044)
Total present value of operating lease liabilities	$ 24,080	$ 24,500

OPERATING LEASE ROU ASSETS AN_5

OPERATING LEASE ROU ASSETS AND LIABILITIES - Weighted average discount and remaining lease term (Details)	Mar. 31, 2024	Dec. 31, 2023
OPERATING LEASE ROU ASSETS AND LIABILITIES
Weighted-average discount rate	2.09%	2.08%
Weighted-average remaining lease term (years)	16 years 1 month 6 days	16 years 2 months 27 days

OPERATING LEASE ROU ASSETS AN_6

OPERATING LEASE ROU ASSETS AND LIABILITIES - Lease expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
OPERATING LEASE ROU ASSETS AND LIABILITIES
Operating lease expense	$ 747	$ 807
Short-term lease expense	26	30
Variable lease expense	5	2
Sublease income		(5)
Total lease expense	778	834
Other Information
Cash paid for amounts included in the measurement of lease liabilities-operating cash flows for operating leases	737	835
Operating Lease - Operating cash flows (Liability reduction)	615	$ 680
ROU assets obtained in exchange for new operating lease liabilities	$ 38

MINIMUM REGULATORY CAPITAL RE_3

MINIMUM REGULATORY CAPITAL REQUIREMENTS (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations
Common equity Tier 1 capital conversation buffer ratio	0.025
Applicable capital conversation buffer ratio	0.025
Common equity Tier 1 to risk-weighted assets
Actual, Capital amount	$ 566,298	$ 567,248
Actual, Ratio	0.120	0.120
Minimum Requirement for Capital Adequacy Purposes	$ 212,812	$ 212,816
Minimum Requirement for Capital Adequacy Purposes, ratio	0.045	0.045
Tier 1 capital to risk weighted assets
Actual, Capital amount	$ 566,298	$ 567,248
Actual, Ratio	0.120	0.120
Minimum Requirement for Capital Adequacy Purposes	$ 283,749	$ 283,755
Minimum Requirement for Capital Adequacy Purposes, ratio	0.060	0.060
Total capital to risk-weighted assets
Actual, Capital amount	$ 617,896	$ 619,138
Actual, Ratio	0.131	0.131
Minimum Requirement for Capital Adequacy Purposes	$ 378,332	$ 378,340
Minimum Requirement for Capital Adequacy Purposes, ratio	0.080	0.080
Tier 1 capital to average assets
Actual, Capital amount	$ 566,298	$ 567,248
Actual, Ratio	0.097	0.100
Minimum Requirement for Capital Adequacy Purposes	$ 232,397	$ 226,690
Minimum Requirement for Capital Adequacy Purposes, ratio	0.040	0.040
HarborOne Bank.
Common equity Tier 1 to risk-weighted assets
Actual, Capital amount	$ 514,878	$ 509,791
Actual, Ratio	0.109	0.108
Minimum Requirement for Capital Adequacy Purposes	$ 212,731	$ 212,724
Minimum Requirement for Capital Adequacy Purposes, ratio	0.045	0.045
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions	$ 307,278	$ 307,267
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions, ratio	0.065	0.065
Tier 1 capital to risk weighted assets
Actual, Capital amount	$ 514,878	$ 509,791
Actual, Ratio	0.109	0.108
Minimum Requirement for Capital Adequacy Purposes	$ 283,641	$ 283,632
Minimum Requirement for Capital Adequacy Purposes, ratio	0.060	0.060
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions	$ 378,188	$ 378,175
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions, ratio	0.080	0.080
Total capital to risk-weighted assets
Actual, Capital amount	$ 566,476	$ 561,682
Actual, Ratio	0.120	0.119
Minimum Requirement for Capital Adequacy Purposes	$ 378,188	$ 378,175
Minimum Requirement for Capital Adequacy Purposes, ratio	0.080	0.080
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions	$ 472,735	$ 472,719
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions, ratio	0.100	0.100
Tier 1 capital to average assets
Actual, Capital amount	$ 514,878	$ 509,791
Actual, Ratio	0.089	0.090
Minimum Requirement for Capital Adequacy Purposes	$ 232,374	$ 226,666
Minimum Requirement for Capital Adequacy Purposes, ratio	0.040	0.040
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions	$ 290,467	$ 283,333
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions, ratio	0.050	0.050

COMPREHENSIVE (LOSS) INCOME (De

COMPREHENSIVE (LOSS) INCOME (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated other comprehensive (loss) income
Balance at beginning of period	$ 583,759	$ 616,976
Balance at end of period	577,683	599,794
Postretirement Benefit
Accumulated other comprehensive (loss) income
Balance at beginning of period	85	150
Other comprehensive income (loss) before reclassifications	(1)
Amounts reclassified from accumulated other comprehensive (loss) income	(20)
Net current period other comprehensive (loss) income	(21)
Balance at end of period	64	150
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive (loss) income
Balance at beginning of period	(43,622)	(47,082)
Other comprehensive income (loss) before reclassifications	(4,223)	6,919
Amounts reclassified from accumulated other comprehensive (loss) income	(1,255)	(1,018)
Net current period other comprehensive (loss) income	(5,478)	5,901
Related tax effect	496	(1,229)
Balance at end of period	(48,604)	(42,410)
Available for Sale Securities
Accumulated other comprehensive (loss) income
Balance at beginning of period	(47,373)	(53,212)
Other comprehensive income (loss) before reclassifications	(4,940)	7,089
Net current period other comprehensive (loss) income	(4,940)	7,089
Related tax effect	348	(1,563)
Balance at end of period	(51,965)	(47,686)
Cash Flow Hedge
Accumulated other comprehensive (loss) income
Balance at beginning of period	3,666	5,980
Other comprehensive income (loss) before reclassifications	718	(170)
Amounts reclassified from accumulated other comprehensive (loss) income	(1,235)	(1,018)
Net current period other comprehensive (loss) income	(517)	(1,188)
Related tax effect	148	334
Balance at end of period	$ 3,297	$ 5,126

FAIR VALUE OF ASSETS AND LIAB_3

FAIR VALUE OF ASSETS AND LIABILITIES (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Assets and liabilities measured on recurring basis
Fair Value	$ 291,008,000	$ 290,151,000
Derivative loan commitments
Assets and liabilities measured on recurring basis
Weighted average pull-through rate	91%	89%
Recurring
Assets and liabilities measured on recurring basis
Fair Value	$ 291,008,000	$ 290,151,000
Recurring | Level 1
Assets and liabilities measured on recurring basis
Fair Value	0	0
Recurring | Level 2
Assets and liabilities measured on recurring basis
Fair Value	291,008,000	290,151,000
Recurring | Level 3
Assets and liabilities measured on recurring basis
Fair Value	0	0
90 Days or More | Recurring | Level 2
Assets and liabilities measured on recurring basis
Loans held for sale	$ 0	$ 0

FAIR VALUE OF ASSETS AND LIAB_4

FAIR VALUE OF ASSETS AND LIABILITIES - Recurring basis (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($) item	Dec. 31, 2023 USD ($) item	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Assets and liabilities measured on recurring basis
Number of transfers | item	0	0
Assets
Securities available for sale, at fair value	$ 291,008,000	$ 290,151,000
Loans held for sale	16,434,000	19,686,000
Mortgage servicing rights	46,597,000	46,111,000	$ 47,080,000	$ 48,138,000
Recurring
Assets
Securities available for sale, at fair value	291,008,000	290,151,000
Loans held for sale	16,434,000	19,686,000
Mortgage servicing rights	46,597,000	46,111,000
Total assets	385,045,000	384,772,000
Recurring | Derivative loan commitments
Assets
Derivative assets	31,006,000	28,824,000
Liabilities
Derivative liabilities	25,415,000	24,551,000
Recurring | Level 1
Assets
Securities available for sale, at fair value	0	0
Recurring | Level 2
Assets
Securities available for sale, at fair value	291,008,000	290,151,000
Loans held for sale	16,434,000	19,686,000
Mortgage servicing rights	46,597,000	46,111,000
Total assets	384,596,000	384,288,000
Recurring | Level 2 | Derivative loan commitments
Assets
Derivative assets	30,557,000	28,340,000
Liabilities
Derivative liabilities	25,365,000	24,100,000
Recurring | Level 3
Assets
Securities available for sale, at fair value	0	0
Total assets	449,000	484,000
Recurring | Level 3 | Derivative loan commitments
Assets
Derivative assets	449,000	484,000
Liabilities
Derivative liabilities	$ 50,000	$ 451,000

FAIR VALUE OF ASSETS AND LIAB_5

FAIR VALUE OF ASSETS AND LIABILITIES - Level 3 (Details) - Derivative and Forward Loan Sale Commitments - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Changes in Level 3 assets
Balance at beginning of period	$ 484	$ 487
Total gains (losses) included in net income	(35)	279
Balance at end of period	449	766
Changes in unrealized gains relating to instruments at period end	449	766
Changes in Level 3 liabilities
Balance at beginning of period	(451)	(104)
Total gains (losses) included in net income	401	(198)
Balance at end of period	(50)	(302)
Changes in unrealized losses relating to instruments at period end	$ (50)	$ (302)

FAIR VALUE OF ASSETS AND LIAB_6

FAIR VALUE OF ASSETS AND LIABILITIES - Impaired Loans (Details)	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Collateral-dependent impaired loans
Assets and liabilities measured on non-recurring basis
Total Losses	$ 29,000
Level 3 | Discount | Residential loans
Assets and liabilities measured on non-recurring basis
Measurement input		0.20
Level 3 | Discount | Commercial real estate
Assets and liabilities measured on non-recurring basis
Measurement input		0.20
Level 3 | Discount | Minimum | Commercial and industrial
Assets and liabilities measured on non-recurring basis
Measurement input		0.25
Level 3 | Discount | Maximum | Commercial and industrial
Assets and liabilities measured on non-recurring basis
Measurement input		0.50
Non-recurring
Assets and liabilities measured on non-recurring basis
Liabilities, Fair value		$ 0	$ 0
Assets, Fair value		$ 0
Non-recurring | Level 3 | Residential loans
Assets and liabilities measured on non-recurring basis
Assets, Fair value			$ 5,746,000
Non-recurring | Level 3 | Collateral-dependent impaired loans | Sales Comparison Approach
Assets and liabilities measured on non-recurring basis
Assets, Fair value	$ 108,000

FAIR VALUE OF ASSETS AND LIAB_7

FAIR VALUE OF ASSETS AND LIABILITIES - Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial assets:
Cash and cash equivalents	$ 393,441	$ 227,350
Securities available for sale, at fair value	291,008	290,151
Securities held to maturity	19,102	19,262
Federal Home Loan Bank stock	26,565	27,098
Loans held for sale	16,434	19,686
Loans, net	4,728,500	4,702,339
Retirement plan annuities	15,315	15,170
Accrued interest receivable	19,470	18,169
Financial liabilities:
Deposits	4,394,024	4,387,409
Mortgagors' escrow accounts	10,364	8,872
Accrued interest payable	7,302	5,251
Carrying Amount
Financial assets:
Cash and cash equivalents	393,441	227,350
Securities available for sale, at fair value	291,008	290,151
Securities held to maturity	19,724	19,796
Federal Home Loan Bank stock	26,565	27,098
Loans held for sale	16,434	19,686
Loans, net	4,728,500	4,702,339
Retirement plan annuities	15,315	15,170
Accrued interest receivable	19,470	18,169
Derivatives	31,006	28,824
Financial liabilities:
Deposits	4,394,024	4,387,409
Borrowed funds	754,380	303,000
Mortgagors' escrow accounts	10,364	8,872
Accrued interest payable	7,302	5,251
Derivatives	25,415	24,551
Fair Value
Financial assets:
Cash and cash equivalents	393,441	227,350
Securities available for sale, at fair value	291,008	290,151
Securities held to maturity	19,102	19,262
Loans held for sale	16,434	19,686
Loans, net	4,500,663	4,482,448
Retirement plan annuities	15,315	15,170
Accrued interest receivable	19,470	18,169
Derivatives	31,006	28,824
Financial liabilities:
Deposits	4,382,830	4,376,269
Borrowed funds	751,277	567,158
Mortgagors' escrow accounts	10,364	8,872
Accrued interest payable	7,302	5,251
Derivatives	25,415	24,551
Fair Value | Level 1
Financial assets:
Cash and cash equivalents	393,441	227,350
Fair Value | Level 2
Financial assets:
Securities available for sale, at fair value	291,008	290,151
Securities held to maturity	19,102	19,262
Loans held for sale	16,434	19,686
Accrued interest receivable	19,470	18,169
Derivatives	30,557	28,340
Financial liabilities:
Borrowed funds	751,277	567,158
Accrued interest payable	7,302	5,251
Derivatives	25,365	24,100
Fair Value | Level 3
Financial assets:
Loans, net	4,500,663	4,482,448
Retirement plan annuities	15,315	15,170
Derivatives	449	484
Financial liabilities:
Deposits	4,382,830	4,376,269
Mortgagors' escrow accounts	10,364	8,872
Derivatives	$ 50	$ 451

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
EARNINGS PER SHARE
Net income available to common stockholders (in thousands)	$ 7,300	$ 7,297
Average number of common shares outstanding	45,285,471	48,434,373
Less: Average unallocated ESOP shares and non-vested restricted shares	(3,373,050)	(3,577,149)
Weighted average number of common shares outstanding used to calculate basic earnings per common share	41,912,421	44,857,224
Dilutive effect of share-based compensation	214,616	427,016
Weighted average number of common shares outstanding used to calculate diluted earnings per common share	42,127,037	45,284,240
Basic	$ 0.17	$ 0.16
Diluted	$ 0.17	$ 0.16
Antidilutive securities excluded from computation of earnings per share	105,836	134,155

SEGMENT REPORTING (Details)

SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) segment	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Segment Reporting Information
Number of reportable segments | segment	2
Net interest and dividend income	$ 30,582	$ 34,398
Provision (benefit) for credit losses	(168)	1,866
Net interest and dividend income, after provision for credit losses	30,750	32,532
Mortgage banking income:
Gain on sale of mortgage loans	2,013	2,224
Changes in mortgage servicing rights fair value	54	(1,692)
Other	2,276	2,216
Total mortgage banking income	4,343	2,748
Other noninterest income	6,398	5,942
Total noninterest income	10,741	8,690
Noninterest expense	31,750	31,509
Income (loss) before income taxes	9,741	9,713
Provision(benefit) for income taxes	2,441	2,416
Net income	7,300	7,297
Total assets at period end	5,862,222	5,572,858	$ 5,667,896
Goodwill at period end	59,042	69,802	$ 59,042
Operating Segments | HarborOne Bank
Segment Reporting Information
Net interest and dividend income	30,485	34,562
Provision (benefit) for credit losses	(168)	1,866
Net interest and dividend income, after provision for credit losses	30,653	32,696
Mortgage banking income:
Intersegment gain (loss)	(236)	(348)
Changes in mortgage servicing rights fair value	(32)	(136)
Other	180	201
Total mortgage banking income	(88)	(283)
Other noninterest income	6,391	5,942
Total noninterest income	6,303	5,659
Noninterest expense	27,407	26,190
Income (loss) before income taxes	9,549	12,165
Provision(benefit) for income taxes	2,386	3,115
Net income	7,163	9,050
Total assets at period end	5,867,715	5,583,453
Goodwill at period end	59,042	59,042
Operating Segments | HarborOne Mortgage.
Segment Reporting Information
Net interest and dividend income	80	327
Net interest and dividend income, after provision for credit losses	80	327
Mortgage banking income:
Gain on sale of mortgage loans	2,013	2,224
Intersegment gain (loss)	308	454
Changes in mortgage servicing rights fair value	86	(1,556)
Other	2,097	2,015
Total mortgage banking income	4,504	3,137
Other noninterest income	10
Total noninterest income	4,514	3,137
Noninterest expense	4,311	5,322
Income (loss) before income taxes	283	(1,858)
Provision(benefit) for income taxes	60	(565)
Net income	223	(1,293)
Total assets at period end	$ 92,719	109,090
Goodwill at period end		$ 10,760

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 7,300	$ 7,297

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false