Randolph Bancorp (RNDB) 10-Q 6 Nov 20 2020 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Oct. 31, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Trading Symbol	RNDB
Entity Registrant Name	Randolph Bancorp, Inc.
Entity Central Index Key	0001667161
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Stock, par value $.01 per share
Entity Incorporation, State or Country Code	MA
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding		5,523,522
Entity Shell Company	false
Entity File Number	001-37780
Entity Tax Identification Number	81-1844402
Entity Address, Address Line One	10 Cabot Place
Entity Address, City or Town	Stoughton
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02072
City Area Code	781
Local Phone Number	963-2100
Document Quarterly Report	true
Document Transition Report	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 5,335	$ 4,371
Interest-bearing deposits	43,756	3,881
Total cash and cash equivalents	49,091	8,252
Certificates of deposit		490
Securities available for sale, at fair value	55,551	57,503
Loans held for sale, at fair value	87,805	62,792
Loans, net of allowance for loan losses of $6,597 in 2020 and $4,280 in 2019	484,548	469,131
Federal Home Loan Bank of Boston stock, at cost	3,797	2,417
Accrued interest receivable	1,654	1,393
Mortgage servicing rights, net	10,944	8,556
Premises and equipment, net	5,133	5,748
Bank-owned life insurance	8,577	8,441
Foreclosed real estate	132
Other assets	15,736	6,281
Total assets	722,968	631,004
Deposits:
Non-interest bearing	93,352	61,603
Interest bearing	391,660	344,581
Brokered	37,273	90,858
Total deposits	522,285	497,042
Federal Reserve Bank advances	15,318
Federal Home Loan Bank of Boston advances	66,903	44,403
Mortgagors' escrow accounts	1,959	2,052
Post-employment benefit obligations	2,289	2,464
Other liabilities	19,276	6,581
Total liabilities	628,030	552,542
Commitments and contingencies (Note 15)
Stockholders' Equity:
Preferred stock, no par value; authorized: 1,000,000 shares; issued: none
Common stock, $.01 par value; authorized: 15,000,000 shares; issued and outstanding: 5,524,390 shares at September 30, 2020 and 5,576,855 shares at December 31, 2019	55	56
Additional paid-in capital	51,201	51,127
Retained earnings	46,415	31,757
ESOP-Unearned compensation	(3,803)	(3,944)
Accumulated other comprehensive income (loss), net of tax	1,070	(534)
Total stockholders' equity	94,938	78,462
Total liabilities and stockholders' equity	$ 722,968	$ 631,004

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Loans, allowance for loan losses	$ 6,597	$ 4,280
Preferred stock, par value	$ 0	$ 0
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	15,000,000	15,000,000
Common stock, shares issued	5,524,390	5,576,855
Common stock, shares outstanding	5,524,390	5,576,855

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Interest and dividend income:
Loans	$ 5,337,000	$ 6,144,000	$ 16,680,000		$ 17,790,000
Securities-taxable	297,000	366,000	990,000		1,108,000
Securities-tax exempt	7,000	8,000	22,000		36,000
Interest-bearing deposits and certificates of deposit	7,000	23,000	68,000		77,000
Total interest and dividend income	5,648,000	6,541,000	17,760,000		19,011,000
Interest expense:
Deposits	730,000	1,365,000	3,237,000		3,746,000
Borrowings	249,000	603,000	696,000		1,825,000
Total interest expense	979,000	1,968,000	3,933,000		5,571,000
Net interest income	4,669,000	4,573,000	13,827,000		13,440,000
Provision (credit) for loan losses	546,000		2,338,000		(144,000)
Net interest income after provision (credit) for loan losses	4,123,000	4,573,000	11,489,000		13,584,000
Non-interest income:
Customer service fees	330,000	363,000	902,000		1,054,000
Gain on loan origination and sale activities, net	18,102,000	5,782,000	39,616,000		13,438,000
Mortgage servicing fees, net	1,180,000	(181,000)	(1,428,000)		362,000
Increase in cash surrender value of life insurance	46,000	45,000	136,000		139,000
Other	216,000	294,000	598,000		578,000
Total non-interest income	19,874,000	6,303,000	39,824,000		15,571,000
Non-interest expenses:
Salaries and employee benefits	7,911,000	7,010,000	24,439,000	[1]	18,514,000
Occupancy and equipment	859,000	673,000	2,395,000		1,972,000
Data processing	242,000	179,000	663,000		570,000
Professional fees	253,000	264,000	888,000		819,000
Marketing	154,000	275,000	458,000		643,000
FDIC insurance	41,000	(55,000)	136,000		91,000
Other	1,591,000	1,372,000	4,410,000		3,850,000
Total non-interest expenses	11,051,000	9,718,000	33,389,000		26,459,000
Income before income taxes	12,946,000	1,158,000	17,924,000		2,696,000
Income tax expense	2,661,000	14,000	3,266,000		97,000
Net income	$ 10,285,000	$ 1,144,000	$ 14,658,000		$ 2,599,000
Earnings per common share:
Basic	$ 2.01	$ 0.21	$ 2.86		$ 0.48
Diluted	$ 2.01	$ 0.21	$ 2.86		$ 0.48
Weighted average shares outstanding:
Basic	5,120,367	5,345,786	5,123,705		5,429,339
Diluted	5,120,367	5,345,786	5,126,077		5,429,339
[1]	Salaries and benefits for the nine months ended September 30, 2020, include the severance and vested stock acceleration costs related to the retirement of the Chief Executive Officer and Chief Financial Officer of the Bank. Total cost of this event was $1.38 million, of which $1.03 million was allocated to the Bank segment and the remainder, $344,000, was allocated to the mortgage segment

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income		$ 10,285	$ 1,144	$ 14,658	$ 2,599
Securities available for sale:
Unrealized holding gains (losses)		(108)	259	1,613	1,653
Reclassification adjustment for net gains realized in income		0	0	0	0
Net unrealized gains (losses)		(108)	259	1,613	1,653
Net-of-tax amount		(108)	259	1,613	1,653
Related tax effects		0	0	0	0
Net-of-tax amount		(3)	(12)	(9)	(36)
Total other comprehensive income (loss)		(111)	247	1,604	1,617
Comprehensive income		10,174	1,391	16,262	4,216
Supplemental Retirement Plan [Member]
Securities available for sale:
Actuarial losses	[1]	9	9	27	27
Prior service credits	[1]	(12)	(21)	(36)	(63)
Net change in supplemental retirement plan		$ (3)	$ (12)	$ (9)	$ (36)
[1]	Amounts are included in other non-interest expenses in the consolidated statements of operations.

Consolidated Statements Changes

Consolidated Statements Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Unearned Compensation ESOP [Member]	Accumulated Other Comprehensive (Loss) [Member]
Beginning balance at Dec. 31, 2018	$ 77,961	$ 60	$ 55,608	$ 28,329	$ (4,132)	$ (1,904)
Beginning balance, shares at Dec. 31, 2018		5,903,793
Net income	2,599			2,599
Other comprehensive income	1,617					1,617
Stock repurchased	(3,470)	$ (3)	(3,467)
Stock repurchased, shares		(233,476)
Restricted stock awards granted, shares		33,335
Restricted stock awards forfeited, shares		(2,500)
Stock-based compensation	681		681
ESOP shares committed to be released	203		62		141
Ending balance at Sep. 30, 2019	79,591	$ 57	52,884	30,928	(3,991)	(287)
Ending balance, shares at Sep. 30, 2019		5,701,152
Beginning balance at Dec. 31, 2018	77,961	$ 60	55,608	28,329	(4,132)	(1,904)
Beginning balance, shares at Dec. 31, 2018		5,903,793
Ending balance at Dec. 31, 2019	78,462	$ 56	51,127	31,757	(3,944)	(534)
Ending balance, shares at Dec. 31, 2019		5,576,855
Beginning balance at Jun. 30, 2019	79,353	$ 58	54,083	29,784	(4,038)	(534)
Beginning balance, shares at Jun. 30, 2019		5,797,705
Net income	1,144			1,144
Other comprehensive income	247					247
Stock repurchased	(1,441)	$ (1)	(1,440)
Stock repurchased, shares		(96,553)
Stock-based compensation	223		223
ESOP shares committed to be released	65		18		47
Ending balance at Sep. 30, 2019	79,591	$ 57	52,884	30,928	(3,991)	(287)
Ending balance, shares at Sep. 30, 2019		5,701,152
Beginning balance at Dec. 31, 2019	78,462	$ 56	51,127	31,757	(3,944)	(534)
Beginning balance, shares at Dec. 31, 2019		5,576,855
Net income	14,658			14,658
Other comprehensive income	1,604					1,604
Stock repurchased	(1,217)	$ (1)	(1,216)
Stock repurchased, shares		(101,131)
Restricted stock awards granted, shares		63,130
Restricted stock awards forfeited, shares		(9,251)
Share redemption for tax withholdings for restricted stock vesting	(60)		(60)
Share redemption for tax withholdings for restricted stock vesting, shares		(5,213)
Stock-based compensation	1,327		1,327
ESOP shares committed to be released	164		23		141
Ending balance at Sep. 30, 2020	94,938	$ 55	51,201	46,415	(3,803)	1,070
Ending balance, shares at Sep. 30, 2020		5,524,390
Beginning balance at Jun. 30, 2020	84,529	$ 55	51,013	36,130	(3,850)	1,181
Beginning balance, shares at Jun. 30, 2020		5,479,884
Net income	10,285			10,285
Other comprehensive income	(111)					(111)
Stock repurchased	(16)		(16)
Stock repurchased, shares		(1,624)
Restricted stock awards granted, shares		48,130
Restricted stock awards forfeited, shares		(2,000)
Stock-based compensation	199		199
ESOP shares committed to be released	52		5		47
Ending balance at Sep. 30, 2020	$ 94,938	$ 55	$ 51,201	$ 46,415	$ (3,803)	$ 1,070
Ending balance, shares at Sep. 30, 2020		5,524,390

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 14,658,000	$ 2,599,000
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Provision (credit) for loan losses	2,338,000	(144,000)
Loans originated for sale	(1,144,058,000)	(616,301,000)
Net gain on sales of mortgage loans	(43,539,000)	(13,590,000)
Proceeds from sales of mortgage loans	1,158,237,000	579,990,000
Net amortization of securities	218,000	92,000
Net change in deferred loan costs and fees, and purchase premiums	324,000	(43,000)
Depreciation and amortization	1,028,000	643,000
Stock-based compensation	1,327,000	681,000
ESOP expense	164,000	203,000
Increase in cash surrender value of life insurance	(136,000)	(139,000)
Net (increase) decrease in mortgage servicing rights	(2,388,000)	(673,000)
Other, net	545,000	(196,000)
Net cash provided by (used in) operating activities	(11,282,000)	(46,878,000)
Cash flows from investing activities:
Redemptions of certificates of deposit	490,000	1,715,000
Securities available for sale:
Purchases	(11,543,000)
Calls/maturities	4,500,000	500,000
Principal payments on mortgage-backed securities	10,390,000	4,430,000
Net loan originations (repayments)	(10,155,000)	891,000
Loan purchases	(1,519,000)	(2,684,000)
Proceeds from residential portfolio sales		23,689,000
Redemptions (purchases) of Federal Home Loan Bank of Boston stock	(1,380,000)	1,715,000
Purchases of premises and equipment	(503,000)	(259,000)
Loss on disposal of assets	90,000
Proceeds from sale of foreclosed real estate		61,000
Net cash (used in) provided by investing activities	(9,630,000)	30,058,000
Cash flows from financing activities:
Net increase in non-brokered deposits	78,828,000	18,019,000
Net increase (decrease) in brokered deposits	(53,585,000)	35,681,000
Net increase in short-term Federal Reserve Bank borrowings	15,318,000
Net increase (decrease) in short-term Federal Home Loan Bank of Boston borrowings	(14,822,000)	(49,665,000)
Issuance of long-term Federal Home Loan Bank of Boston advances	40,000,000	20,000,000
Repayments of long-term Federal Home Loan Bank of Boston advances	(2,678,000)	(1,703,000)
Net increase (decrease) in mortgagors' escrow accounts	(93,000)	70,000
Repurchases of common stock	(1,217,000)	(3,470,000)
Net cash provided by financing activities	61,751,000	18,932,000
Net change in cash and cash equivalents	40,839,000	2,112,000
Cash and cash equivalents at beginning of period	8,252,000	7,118,000
Cash and cash equivalents at end of period	49,091,000	9,230,000
Supplemental cash flow information:
Interest paid on deposits and borrowed funds	4,225,000	5,328,000
Income taxes paid	1,025,000	15,000
Non-cash item:
Transfer of held for sale loans to portfolio	6,537,000	6,553,000
Transfer of portfolio loan to held for sale		28,608,000
Donation of land, net		$ 73,000
Transfer of portfolio loan to foreclosed real estate	$ 132,000

Basis of Financial Statement Pr

Basis of Financial Statement Presentation	9 Months Ended
	Sep. 30, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Financial Statement Presentation	1. BASIS OF FINANCIAL STATEMENT PRESENTATION The unaudited consolidated financial statements include the accounts of Randolph Bancorp, Inc. (“Bancorp”) and its wholly-owned subsidiary, Envision Bank (the “Bank”, together with Bancorp, the “Company”). The Bank has subsidiaries involved in owning investment securities and foreclosed real estate properties and a subsidiary which provides loan closing services. All intercompany accounts and transactions have been eliminated in consolidation. When necessary, certain amounts in prior year financial statements have been reclassified to conform to the current year’s presentation. These unaudited financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) for interim financial reporting and with the instructions to Form 10-Q and Article 10 of Regulation S-X issued by the Securities and Exchange Commission (“SEC”). Accordingly, the accompanying interim financial statements do not include all information required under GAAP for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation of the financial statements, primarily consisting of normal recurring adjustments, have been included. The operating results for the three and nine months ended September 30, 2020 are not necessarily indicative of the results to be expected for the year ending December 31, 2020 or any other interim period. For further information, refer to the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, as filed with the SEC.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2020
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Pronouncements	2. RECENT ACCOUNTING PRONOUNCEMENTS In February 2016, FASB issued ASU 2016-02, Leases In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses

Global Pandemic Affecting Rando

Global Pandemic Affecting Randolph Bancorp, Inc.	9 Months Ended
	Sep. 30, 2020
Risks And Uncertainties [Abstract]
Global Pandemic Affecting Randolph Bancorp, Inc. In 2020	3 . GLOBAL PANDEMIC AFFECTING RANDOLPH BANCORP, INC. IN 2020 On March 13, 2020, the United States Government declared a national emergency in response to the coronavirus (“COVID-19”) outbreak. This outbreak has caused, among other things, widespread shutdowns of businesses and volatile markets and has severely disrupted normal economic activity in the region the Company serves as well as across the nation. The following summarizes the more significant financial repercussions of this national emergency for the Company. Credit Quality and Allowance for Loan Losses The Company established a $558,000 allowance for loan losses during the first nine months of 2020 directly related to its estimate, based on available information, of probable incurred losses resulting from the impact of the COVID-19 pandemic. As the Company acquires additional information on overall economic prospects together with further assessments of the impact on individual borrowers, the loss estimated will be revised as needed, and these revisions could be material. The Company’s approach to estimat ing the impact of this pandemic on credit quality is presented in Note 6 – “ Loans and Allowance for Loan Losses . ” Disaster Response Plan Costs The Company implemented its disaster response plans when the national emergency was declared and a stay at home order was issued in the Commonwealth of Massachusetts. To operate in this mode the Company incurred expenses for, among other things, compensation for front-line and quarantined employees, buying equipment for a remote workforce, cleaning of office and branch buildings, and communications with customers regarding the status of the Company’s operations. These plan costs amounted to $229,000 through the first nine months of 2020. Loan Payment Deferral and Paycheck Protection Program In response to the pandemic’s effect on our customers, the Company implemented a series of measures through the date of this report, including participation in the Small Business Administration’s (“SBA”) Paycheck Protection Program (the “PPP”) and granting payment deferrals for residential mortgage, home equity and certain commercial borrowers who were current in their payments. As of September 30, 2020, the Company had a balance of $15.4 million loans as part of the PPP. These loans are included with commercial and industrial loans, are pledged to the Federal Reserve’s Paycheck Protection Program Liquidity Facility and have no direct effect on the Company’s capital ratios. T In accordance with interagency guidance issued in March 2020 and/or the CARES Act enacted in March 2020, these short-term deferrals are not considered troubled debt restructurings, provided the loan was current as of the date the deferral program was implemented, or December 31, 2019 for deferrals made under the CARES Act. The Company has agreed to loan payment deferrals on commercial loans totaling $37.0 million, residential real estate loans in portfolio totaling $17.9 million and residential real estate loans serviced for others totaling $66.8 million as of September 30, 2020. The commercial loan payment deferrals are concentrated in the hotel and hospitality, restaurant and retail service industries. The qualifying residential real estate and commercial loan borrowers were required to contact the Company to receive loan payment deferrals. The table below summarizes the status of the bank’s loan deferral activity at September 30, 2020: Deferrals Suspended/ Resumed Full Granted Reduced Payment Payment Payoff (In thousands) September 30, 2020 Real estate loans: Residential: One-to-four family $ 14,902 $ 5,270 $ 8,825 $ 807 Home equity loans and lines of credit 2,984 1,314 1,670 - Commercial 33,286 19,287 13,999 - Total real estate loans 51,172 25,871 24,494 807 Commercial and industrial 3,710 33 1,830 1,847 Consumer 20 - 20 - Total $ 54,902 $ 25,904 $ 26,344 $ 2,654 The payment deferral programs were applied prospectively from the respective dates of the events and did not change the delinquency status of the loans as of such dates. Accordingly, if all payments were current at the date of the event, the loan will not be reported as past due during the deferral period. Furthermore, for loans subject to the deferral programs on which payments were past due prior to the event, the delinquency status of such loans was frozen to the status that existed at the date of the event until the end of the deferral period. Accordingly, the table below summarizes the risk rating and for all loans that were granted deferral, and any loans that were listed in nonaccrual status at September 30, 2020: Pass Rated / Special Sub- Non- Not Rated Mention standard (1) accrual (1) (2) (In thousands) September 30, 2020 Real estate loans: Residential: One-to-four family $ 13,071 $ 778 $ 246 $ 196 Home equity loans and lines of credit 2,984 - - - Commercial 19,451 5,378 8,457 6,986 Total real estate loans 35,506 6,156 8,703 7,182 Commercial and industrial 1,378 452 33 33 Consumer 20 - - - Total $ 36,904 $ 6,608 $ 8,736 $ 7,215 (1) Includes one commercial real estate relationship for which a $2.8 million full repayment was made in early October 2020. (2) Nonaccrual loans are risk rated as either special mention or substandard and are included as a balance in those columns.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	4 . ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Accounting principles generally require that recognized revenue, expenses, gains and losses be included in net income (loss). Although certain changes in assets and liabilities are reported as a separate component of stockholders’ equity, such items, along with net income (loss), are components of comprehensive income (loss). The components of accumulated other comprehensive income (loss), included in total stockholders’ equity, are as follows: September 30, December 31, 2020 2019 (In thousands) Securities available for sale: Net unrealized gain $ 1,780 $ 167 Tax effect (313 ) (313 ) Net-of-tax amount 1,467 (146 ) Supplemental retirement plan Unrecognized net actuarial loss (625 ) (652 ) Unrecognized net prior service credit 275 311 (350 ) (341 ) Tax effect (47 ) (47 ) Net-of-tax amount (397 ) (388 ) Accumulated other comprehensive income (loss) $ 1,070 $ (534 )

Securities Available for Sale

Securities Available for Sale	9 Months Ended
	Sep. 30, 2020
Investments Debt And Equity Securities [Abstract]
Securities Available for Sale	5 . SECURITIES AVAILABLE FOR SALE The amortized cost and fair value of securities available for sale, including gross unrealized gains and losses, are as follows: Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value (In thousands) September 30, 2020 Debt securities: Corporate 4,319 24 (7 ) 4,336 Municipal 744 6 — 750 Residential mortgage-backed securities: U.S. Government-sponsored enterprises 34,190 974 — 35,164 Commercial mortgage-backed securities: U.S. Government-sponsored enterprises 8,887 551 — 9,438 U.S. Government-guaranteed 1,023 24 — 1,047 Collateralized mortgage obligations: U.S. Government-sponsored enterprises 1,049 58 — 1,107 U.S. Government-guaranteed 3,559 150 — 3,709 Total securities available for sale $ 53,771 $ 1,787 $ (7 ) $ 55,551 December 31, 2019 Debt securities: U.S. Government-sponsored enterprises $ 4,000 $ 13 $ (1 ) $ 4,012 Corporate 1,513 15 — 1,528 Municipal 744 9 — 753 Residential mortgage-backed securities: U.S. Government-sponsored enterprises 35,238 458 (286 ) 35,410 Commercial mortgage-backed securities: U.S. Government-sponsored enterprises 8,977 — (53 ) 8,924 U.S. Government-guaranteed 1,363 7 — 1,370 Collateralized mortgage obligations: U.S. Government-sponsored enterprises 1,395 23 — 1,418 U.S. Government-guaranteed 4,106 10 (28 ) 4,088 Total securities available for sale $ 57,336 $ 535 $ (368 ) $ 57,503 There were no sales of securities during the nine months ended September 30, 2020 and 2019. The amortized cost and fair value of debt securities by contractual maturity at September 30, 2020 are presented below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Fair Cost Value (In thousands) Within 1 year $ 505 $ 510 After 1 year through 5 years 3,486 3,511 After 5 years through 10 years 1,072 1,065 5,063 5,086 Mortgage-backed securities 48,708 50,465 $ 53,771 $ 55,551 Information pertaining to securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous loss position, follows: Less Over Twelve Months Gross Gross Unrealized Fair Unrealized Fair Losses Value Losses Value September 30, 2020 (In thousands) Corporate $ (7 ) $ 1,065 $ — $ — December 31, 2019 U.S. Government-sponsored enterprises $ — $ — $ (1 ) $ 1,999 Residential mortgage-backed securities: U.S. Government-sponsored enterprises (123 ) 11,256 (163 ) 9,632 Commercial mortgage-backed securities: U.S. Government-sponsored enterprises (53 ) 8,924 — — Collateralized mortgage obligations: U.S. Government-guaranteed (15 ) 1,891 (13 ) 883 Total $ (191 ) $ 22,071 $ (177 ) $ 12,514 At September 30, 2020, one debt security had unrealized losses with aggregate depreciation of 0.65% from the Company’s amortized cost basis. The unrealized losses at September 30, 2020 were due to securities price fluctuations since the time they were purchased. The Company currently does not believe it is probable that it will be unable to collect all amounts due according to the contractual terms of these investments. Therefore, it is expected that the securities would not be settled at a price less than the par value of the investment. Because the Company does not intend to sell any debt securities and it is more likely than not that the Company will not be required to sell any debt securities before recovery of its amortized cost basis, it does not consider these investments to be other-than-temporarily impaired at September 30, 2020.

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Loans and Allowance for Loan Losses	6 . LOANS AND ALLOWANCE FOR LOAN LOSSES A summary of the loan portfolio is as follows: September 30, 2020 December 31, 2019 (In thousands) Real estate loans: Residential: One-to-four family $ 235,955 $ 244,711 Home equity loans and lines of credit 48,097 41,669 Commercial 141,862 125,405 Construction 32,064 35,485 457,978 447,270 Commercial and industrial 20,388 9,093 Consumer 11,696 15,641 Total loans 490,062 472,004 Allowance for loan losses (6,597 ) (4,280 ) Net deferred loan costs and fees, and purchase premiums 1,083 1,407 $ 484,548 $ 469,131 The following table s present activity in the allowance for loan losses by loan category for the three and nine months ended September 30, 2020 and 2019 , and allocation of the allowance to each category as of September 30, 2020 and December 31, 2019 : Residential 1-4 Family Second Mortgages and HELOC Commercial Real Estate Construction Commercial and Industrial Consumer Total (In thousands) Three Months Ended September 30, 2020 Allowance at June 30, 2020 $ 1,553 $ 378 $ 2,766 $ 897 $ 319 $ 146 $ 6,059 Provision (credit) for loan losses 30 77 589 (90 ) (75 ) 15 546 Loans charged-off — (3 ) — — — (8 ) (11 ) Recoveries — — — — 2 1 3 Balance at September 30, 2020 $ 1,583 $ 452 $ 3,355 $ 807 $ 246 $ 154 $ 6,597 Three Months Ended September 30, 2019 Allowance at June 30, 2019 $ 1,018 $ 297 $ 1,625 $ 755 $ 264 $ 195 $ 4,154 Provision (credit) for loan losses 43 (6 ) 22 (30 ) 6 (35 ) — Loans charged-off — — — — — (3 ) (3 ) Recoveries 2 — — — — - 2 Balance at September 30, 2019 $ 1,063 $ 291 $ 1,647 $ 725 $ 270 $ 157 $ 4,153 Nine Months Ended September 30, 2020 Allowance at December 31, 2019 $ 1,096 $ 289 $ 1,840 $ 692 $ 235 $ 128 $ 4,280 Provision for loan losses 480 166 1,515 115 9 53 2,338 Loans charged-off — (3 ) — — — (37 ) (40 ) Recoveries 7 — — — 2 10 19 Balance at September 30, 2020 $ 1,583 $ 452 $ 3,355 $ 807 $ 246 $ 154 $ 6,597 Nine Months Ended September 30, 2019 Allowance at December 31, 2018 $ 1,092 $ 292 $ 1,648 $ 765 $ 265 $ 375 $ 4,437 Provision (credit) for loan losses (52 ) (1 ) (1 ) (40 ) 5 (55 ) (144 ) Loans charged-off — — — — — (171 ) (171 ) Recoveries 23 — — — — 8 31 Balance at September 30, 2019 $ 1,063 $ 291 $ 1,647 $ 725 $ 270 $ 157 $ 4,153 Additional information pertaining to the allowance for loan losses at September 30, 2020 and December 31, 2019 is as follows: Residential 1-4 Family Second Mortgages and HELOC Commercial Real Estate Construction Commercial and Industrial Consumer Total September 30, 2020 (In thousands) Allowance for impaired loans $ 79 $ — $ — $ — $ — $ — $ 79 Allowance for non-impaired loans 1,504 452 3,355 807 246 154 6,518 Total allowance for loan losses $ 1,583 $ 452 $ 3,355 $ 807 $ 246 $ 154 $ 6,597 Impaired loans $ 4,581 $ 607 $ 7,028 $ — $ 33 $ — $ 12,249 Non-impaired loans 231,374 47,490 134,834 32,064 20,355 11,696 477,813 Total loans $ 235,955 $ 48,097 $ 141,862 $ 32,064 $ 20,388 $ 11,696 $ 490,062 December 31, 2019 Allowance for impaired loans $ 116 $ — $ — $ — $ — $ — $ 116 Allowance for non-impaired loans 980 289 1,840 692 235 128 4,164 Total allowance for loan losses $ 1,096 $ 289 $ 1,840 $ 692 $ 235 $ 128 $ 4,280 Impaired loans $ 5,640 $ 407 $ 46 $ — $ — $ — $ 6,093 Non-impaired loans 239,071 41,262 125,359 35,485 9,093 15,641 465,911 Total loans $ 244,711 $ 41,669 $ 125,405 $ 35,485 $ 9,093 $ 15,641 $ 472,004 As described in Note 3 – “Global Pandemic Affecting Randolph Bancorp, Inc. in 2020,” the COVID-19 pandemic has affected the Company’s operations in the first nine months of 2020. This pandemic has severely disrupted normal economic activity in the communities the Company serves along with the rest of the nation. It is impossible to know the full extent of the impact of the COVID-19 pandemic and the continued effects it may have on the Company’s operations. Management has determined a separate element of the allowance to represent the estimate of probable incurred losses associated with the impact of the pandemic events on the Company’s loan portfolios. This estimate is judgmental and subject to changes as conditions evolve. This qualitative element of the allowance was determined based on the impact the pandemic has had on current employment levels, economic activity in the Company’s geographic regions, and the time it could take for the affected regions to return to a more normalized operating environment. The following is a summary of past due and non-accrual loans at September 30, 2020 and December 31, 2019: 30 - 59 Days Past Due 60 - 89 Days Past Due 90 Days or More Past Due Total Past Due Non-accrual Loans (In thousands) September 30, 2020 Residential one-to-four family $ 267 $ 246 $ 582 $ 1,095 $ 2,215 Home equity loans and lines of credit — 66 — 66 582 Commercial real estate — — — — 6,986 Construction — — — — — Commercial and industrial — — — — 33 Consumer — — — — — Total $ 267 $ 312 $ 582 $ 1,161 $ 9,816 December 31, 2019 Residential one-to-four family $ 215 $ 587 $ — $ 802 $ 2,922 Home equity loans and lines of credit 188 244 — 432 336 Commercial real estate — — — — — Construction — — — — — Commercial and industrial — — — — — Consumer 76 11 — 87 — Total $ 479 $ 842 $ — $ 1,321 $ 3,258 The following is a summary of impaired loans at September 30, 2020 and December 31, 2019: Recorded Investment Unpaid Principal Balance Related Allowance (In thousands) September 30, 2020 Impaired loans without a valuation allowance: Residential one-to-four family $ 3,636 $ 3,660 Home equity loans and lines of credit 607 607 Commercial real estate 7,028 7,028 Commercial and industrial 33 33 Total 11,304 11,328 Impaired loans with a valuation allowance: Residential one-to-four family 945 959 $ 79 945 959 79 Total impaired loans $ 12,249 $ 12,287 $ 79 December 31, 2019 Impaired loans without a valuation allowance: Residential one-to-four family $ 3,322 $ 3,322 Home equity loans and lines of credit 407 407 Commercial real estate 46 46 Total 3,775 3,775 Impaired loans with a valuation allowance: Residential one-to-four family 2,318 2,318 $ 116 Total 2,318 2,318 116 Total impaired loans $ 6,093 $ 6,093 $ 116 Additional information pertaining to impaired loans follows: Average Interest Cash Basis Recorded Income Interest Investment Recognized Recognized (In thousands) Three Months Ended September 30, 2020 Residential one-to-four family $ 4,630 $ 144 $ 61 Home equity loans and lines of credit 607 25 — Commercial real estate 7,028 — — Consumer 33 — — Total $ 12,298 $ 169 $ 61 Three Months Ended September 30, 2019 Residential one-to-four family $ 5,497 $ 49 $ 12 Home equity loans and lines of credit 369 1 — Commercial real estate 84 2 — Consumer 33 — — Total $ 5,983 $ 52 $ 12 Nine Months Ended September 30, 2020 Residential one-to-four family $ 4,563 $ 277 $ 131 Home equity loans and lines of credit 559 27 — Commercial real estate 4,713 — — Consumer 15 — — Total $ 9,850 $ 304 $ 131 Nine Months Ended September 30, 2019 Residential one-to-four family $ 5,586 $ 175 $ 63 Home equity loans and lines of credit 414 10 10 Commercial real estate 153 4 — Consumer 43 1 — Total $ 6,196 $ 190 $ 73 Troubled Debt Restructurings The Company periodically grants concessions to borrowers experiencing financial difficulties. The Company’s troubled debt restructurings consist primarily of interest rate concessions for periods of three months to thirty years for residential real estate loans, and for periods up to one year for commercial real estate loans. At September 30, 2020, the Company had sixteen residential real estate loans, one consumer loan and one commercial real estate loan aggregating $2,780,000, $ 4 9 At September 30, 2019, the Company had nineteen residential real estate loans and one commercial real estate loan aggregating $ As of September 30, 2020 and 2019, $ For the nine months ended Septe m i n S p Management performs a discounted cash flow calculation to determine the amount of valuation reserve required on each of the troubled debt restructurings. Any reserve required is recorded as part of the allowance for loan losses. D u ring the t h ree a n d nine mo n t h s ended September 3 0 , 2020 and 2 0 1 9 , t h ere were no material c h a ng e s to t h e all o w a n ce fo r l o an l o sses a s a re s u lt o f l o an m o dificati o n s made w h ich w ere c ons i d er e d a tr ou b led d e bt rest ru cturing. No additional funds are committed to be advanced in connection with trouble debt restructurings. During the three and nine months ended September 30, 2020 and 2019, there were no troubled debt restructurings that defaulted (over 30 days past due) within twelve months of the restructure date. At September 30, 2020, there were two residential real estate troubled debt restructurings that were granted payment deferral plans. One loan, totaling $300,000, was performing in accordance with its modified terms and is currently in repayment, and one loan, for $196,000, was not performing in accordance with its modified terms and is currently still in payment suspension. Credit Quality Information The Company utilizes an eight-grade internal loan rating system for commercial real estate, construction and commercial and industrial loans, as follows: Loans rated 1 – 3B are considered “pass” rated loans with low to average risk. Loans rated 4 are considered “special mention.” These loans are starting to show signs of potential weakness and are being closely monitored by management. Loans rated 5 are considered “substandard” and are 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 6 are considered “doubtful” and 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 7 are considered uncollectible (“loss”) and of such little value that their continuance as loans is not warranted. On an annual basis, or more often if needed, the Company formally reviews the ratings on all commercial real estate, construction and commercial and industrial loans. 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. The following table presents the Company’s loans by risk rating at the dates indicated: September 30, 2020 December 31, 2019 Commercial Real Construction Commercial and Industrial Commercial Real Construction Commercial and Industrial (In thousands) Loans rated 1 - 3B (Pass rated) $ 127,298 $ 32,064 $ 19,903 $ 121,703 $ 35,485 $ 8,134 Loans rated 4 6,107 — 452 3,702 — 206 Loans rated 5 8,457 — 33 — — 753 $ 141,862 $ 32,064 $ 20,388 $ 125,405 $ 35,485 $ 9,093 Residential mortgages, home equity loans and lines of credit, and consumer loans are monitored for credit quality based primarily on their payment status. When one of these loans becomes more than 90 days delinquent, it is assigned an internal loan rating. At September 30, 2020, $ $ d n g g t ub n $ d n g a g e i h o e u e e n

Loan Servicing

Loan Servicing	9 Months Ended
	Sep. 30, 2020
Transfers And Servicing [Abstract]
Loan Servicing	7 . LOAN SERVICING Mortgage loans serviced for others are not included in the accompanying unaudited consolidated balance sheets. The unpaid principal balances of residential mortgage loans serviced for others were $1.59 billion and $1.05 billion at September 30, 2020 and December 31, 2019, respectively. The following table summarizes the activity relating to mortgage servicing rights (“MSRs”) for the three and nine months ended For the Three Months Ended For the Nine Months Ended September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 (In thousands) Mortgage servicing rights: Balance at beginning of period $ 12,090 $ 8,322 $ 9,484 $ 7,794 Additions through originations 2,570 1,115 6,131 2,215 Amortization (807 ) (334 ) (1,762 ) (906 ) Balance at end of period $ 13,853 $ 9,103 $ 13,853 $ 9,103 Valuation allowance: Balance at beginning of period $ 3,996 $ 121 $ 928 $ 8 Provision (release) (1,087 ) 523 1,981 636 Balance at end of period $ 2,909 $ 644 $ 2,909 $ 644 Amortized cost, net $ 10,944 $ 8,459 $ 10,944 $ 8,459 Fair value $ 11,014 $ 8,549 $ 11,014 $ 8,549 During the nine months ended September 30, 2020 and 2019, the Company increased the valuation allowance for its MSRs by $1,981,000 and $636,000, respectively. Such adjustments to the valuation allowance were due primarily to changes in fair value caused by the impact of changes in interest rates on expected loan prepayments.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	8 . INCOME TAXES Income tax expense for the three months ended September 30, 2020 e n d I n c m ta ex p e n o t h t h mo n h n d e eptem b e 3 0 201 ep e o e p e e n I n c o a ex p n f o e p m b ep e e e I n o e xp e n f o th n i n mo n t h en d e Se p em b 3 0 201 re p se n $ o i n e e n e e a e as o h p e e o h y From 2014 to June 30, 2020, the Company has maintained a valuation allowance on its net deferred tax asset based on a determination that it was more likely than not that such assets would not be realized. This determination was based on the Company’s net operating loss carryforward position, its current period operating results exclusive of non-recurring items and its expectations for the upcoming year. As a result, the 100% valuation allowance for deferred tax assets relating to net operating loss carryforwards was maintained. D u h o n o u i n t h mo n h 2 02 0 and the Company being in a net deferred tax liability position at September 30, 2020 h f u o o the Company’s net operating loss carryforwards was absorbed and the previously held valuation allowance was reversed

On-Balance Sheet Derivative Ins

On-Balance Sheet Derivative Instruments and Hedging Activities	9 Months Ended
	Sep. 30, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
On-Balance Sheet Derivative Instruments and Hedging Activities	9. ON-BALANCE SHEET DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES Derivative Loan Commitments Mortgage loan interest rate lock 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 rates and times in the future, with the intention that these loans will subsequently be sold either in the secondary market, to large aggregators of loans or to other financial institutions. 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 the rate lock to funding of the loan due to an increase 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. The notional amount of derivative loan commitments was $418,903,000 and $89,925,000 at September 30, 2020 and December 31, 2019, respectively. The fair value of such commitments at September 30, 2020 and December 31, 2019 was $11,967,000 and $1,472,000, respectively, and is included in other assets in the consolidated balance sheets. Forward Loan Sale Commitments The Company utilizes both “mandatory delivery” and “best efforts” forward loan sale commitments and To Be Announced (“TBA”) securities to mitigate the risk of potential decreases in the value of loans that would result from the exercise of the derivative loan commitments as well as for loans held for sale. 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 amount 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 and TBA securities will experience changes in fair value that serve to offset the change in fair value of loans held for sale and derivative loan commitments the degree to which depends on the notional amount of such sale commitments. The notional amount of forward loan sale commitments and TBA securities was $372,429,000 and $85,401,000 at September 30, 2020 and December 31, 2019, respectively. The fair value of such commitments consisted of liabilities of $924,000 and $140,000 at September 30, 2020 and December 31, 2019, respectively, included in other liabilities in the consolidated balance sheets and assets of $121,000 and $11,000 are included in other assets in the consolidated balance sheets as of September 30, 2020 and December 31, 2019, respectively.

Employee Stock Ownership Plan

Employee Stock Ownership Plan	9 Months Ended
	Sep. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Employee Stock Ownership Plan	10 . The Company maintains an Employee Stock Ownership Plan (“ESOP”), which is a tax-qualified retirement plan providing eligible employees the opportunity to own Bancorp stock. Bancorp made a loan to the ESOP for the purchase of 469,498 shares of its common stock at $10.00 per share in connection with its initial public offering in July 2016. The loan is payable annually over 25 years with interest at the prime rate to be reset each January 1. The loan is secured by the shares which have not yet been allocated to participants. Loan payments are funded by cash contributions from the Bank. Such contributions are allocated to eligible participants based on their compensation, subject to federal tax limits. Shares are committed to be released on a monthly basis and allocated as of December 31 of each year. The number of shares to be allocated annually is 18,780 through the year 2040. For the three and nine months ended September 30, 2020, the Company recognized compensation expense for the ESOP of $52,000 and $164,000, respectively, while for the three and nine months ended September 30, 2019, the Company recognized compensation expense for the ESOP of $65,000 and $203,000, respectively. The fair value of the 380,319 unallocated ESOP shares at September 30, 2020 was $4,727,000.

Share Repurchase Program

Share Repurchase Program	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Share Repurchase Program	1 1 . SHARE REPURCHASE PROGRAM In September 2017, the Company’s Board of Directors adopted a share repurchase program under which the Company may repurchase up to 10%, or 586,854 shares, of its then outstanding common shares. Repurchases under the program may be made in open market or in privately negotiated transactions and pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the SEC. Any repurchased shares will be held by the Company as authorized but unissued shares. The repurchase program e xp i b 4 0 On October 27, 2020, the Company announced a new stock repurchase program. See Note 17, Subsequent Events, for additional information.

Earnings (Loss) Per Share

Earnings (Loss) Per Share	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Earnings (Loss) Per Share	1 2 . EARNINGS (LOSS) PER SHARE Basic earnings per share represents net income divided by the weighted average of common shares outstanding during the period. Diluted earnings per share represents net income divided by the weighted average of common shares and all potentially dilutive common shares outstanding during the period. Unvested restricted shares of common stock having dividend rights are treated as “participating securities” and, accordingly, are considered outstanding in computing basic and diluted earnings per share. Unallocated ESOP shares are not considered to be outstanding for purposes of computing basic or diluted earnings per share. The following table sets forth the calculation of the average number of shares outstanding used to calculate the basic and diluted earnings per share for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Average number of common shares outstanding 5,503,020 5,747,207 5,511,028 5,835,455 Less: Average unallocated ESOP shares (382,653 ) (401,421 ) (387,323 ) (406,116 ) Average number of common shares outstanding used to calculate basic earnings per share 5,120,367 5,345,786 5,123,705 5,429,339 Effect of dilutive stock options — — 2,372 — Average number of common shares outstanding used to calculate dilutive earnings per share 5,120,367 5,345,786 5,126,077 5,429,339

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	1 3 . STOCK-BASED COMPENSATION Under the Randolph Bancorp, Inc. 2017 Stock Option and Incentive Plan (the “Equity Plan”), the Company may grant options, restricted stock, restricted units or performance awards to its directors, officers and employees. Both incentive stock options and nonqualified stock options may be granted under the Equity Plan with 586,872 shares initially reserved for options. Any options forfeited because vesting requirements are not met or expired will become available for re-issuance under the Equity Plan. The exercise price of each option equals the market price of the Company’s stock on the date of the grant and the maximum term of each option is 10 years. The total number of shares initially reserved for restricted stock is 234,749. Options and awards generally vest ratably over three to five years. The fair value of shares awarded is based on the market price at the date of grant. Stock Options The fair value of each option grant is estimated on the date of the grant using the Black-Scholes option-pricing model with the following assumptions: • Volatility is based on peer group volatility because the Company does not have a sufficient trading history. • Expected life represents the period of time that the option is expected to be outstanding, taking into account the contractual term, and the vesting period. • Expected dividend yield is based on the Company's history and expectation of dividend payouts. • The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant for a period equivalent to the expected life of the option. During the nine months ended September 30, 2020 and 2019, the Company made the following grants of options to purchase shares of common stock and used the following assumptions in measuring the fair value of such grants: 2020 2019 Options granted 330,118 57,252 Vesting period (years) 3-5 1-5 Expiration period (years) 10 10 Expected volatility 27.65 % 29.87 % Expected life (years) 6.2 6.5 Expected dividend yield — — Risk free interest rate 0.45% - 1.10% 2.37% - 2.61% Option fair value $2.69 - $4.32 $2.99 - $5.83 A summary of stock option activity for the nine months ended September 30, 2020 is presented in the table below: Options Stock Option Grants Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Balance at January 1, 2020 360,207 $ 14.82 7.26 $ — Granted 330,118 12.14 Forfeited (14,543 ) 15.34 Expired (91,614 ) 14.67 Balance at September 30, 2020 584,168 $ 13.32 8.65 $ 357,681 Exercisable at September 30, 2020 101,993 $ 14.92 7.27 $ — Unrecognized compensation cost (inclusive of directors' options) $ 1,533,857 Weighted average remaining recognition period (years) 3.20 For the nine months ended September 30, 2020 and 2019, stock-based compensation expense applicable to stock options was $545,000 and $271,000, respectively. For the three months ended S e p tem b e Included in expense for the n n p m b e Restricted Stock Shares issued may be either authorized but unissued shares or reacquired shares held by the Company. Any shares forfeited because vesting requirements are not met will become available for reissuance under the Equity Plan. The fair market value of shares awarded, based on the market price at the date of grant, is amortized over the applicable vesting period. Restricted stock awarded to date has been at no cost to the awardee. The following table presents the activity in restricted stock awards under the Equity Plan for the nine months ended September 30, 2020: Restricted Stock Awards Weighted Average Grant Price Restricted stock awards at January 1, 2020 125,861 $ 14.76 Granted 63,130 10.84 Vested (41,380 ) 14.72 Forfeited (9,251 ) 14.88 Restricted stock awards at September 30, 2020 138,360 $ 12.97 Unrecognized compensation cost $ 1,421,896 Weighted average remaining recognition period (years) 3.40 For the n n Se p em b e Included in expense for the n n e p m b

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities	1 4 . FAIR VALUE OF ASSETS AND LIABILITIES Determination of fair value The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company’s various assets and liabilities. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the asset or liability. The following methods and assumptions were used by the Company in estimating fair value disclosures: Securities Loans held for sale Loans Mortgage servicing rights On-balance-sheet derivatives Off-balance sheet credit-related instruments Assets and liabilities recorded at fair value on a recurring basis Assets and liabilities recorded at fair value on a recurring basis are summarized below. Total Level 1 Level 2 Level 3 Fair (In thousands) September 30, 2020 Assets: Securities available for sale $ — $ 55,551 $ — $ 55,551 Portfolio loans (fair value option) — 14,384 — 14,384 Loans held for sale (fair value option) — 87,805 — 87,805 Derivative loan commitments — 11,967 — 11,967 Forward loan sale commitments — 121 — 121 Liabilities: Forward loan sale commitments, including TBAs — 924 — 924 December 31, 2019 Assets: Securities available for sale $ — $ 57,503 $ — $ 57,503 Portfolio loans (fair value option) — 9,826 — 9,826 Loans held for sale (fair value option) — 62,792 — 62,792 Derivative loan commitments — 1,472 — 1,472 Forward loan sale commitments — 11 — 11 Liabilities: Forward loan sale commitments, including TBAs — 140 — 140 There were no transfers between levels for assets and liabilities recorded at fair value on a recurring basis during the nine months ended September 30, 2020 and 2019. Assets recorded at fair value on a non-recurring basis The Company may also be required, from time to time, to record certain other assets at fair value on a non-recurring basis in accordance with GAAP. These adjustments to fair value usually result from application of lower-of-cost-or-market accounting or write-downs of individual assets. The following table summarizes the fair value hierarchy used to determine each adjustment and the carrying value of the related assets as of September 30, 2020 and December 31, 2019. Period Ended September 30, 2020 September 30, 2020 Level 1 Level 2 Level 3 Total Gains (Losses) (In thousands) Collateral dependent impaired loans $ — $ — $ 9,993 $ — Mortgage servicing rights — — 10,944 (1,981 ) Foreclosed real estate — — 132 — $ — $ — $ 21,069 $ (1,981 ) December 31, 2019 Level 1 Level 2 Level 3 (In thousands) Collateral dependent impaired loans $ — $ — $ 2,250 Mortgage servicing rights — — 8,556 $ — $ — $ 10,806 The Company recorded a net increase in the valuation allowance for its MSRs of $1,981,000 during the nine months ended September 30, 2020. The Company utilizes an independent valuation from a third party which uses a discounted cash flow model to estimate the fair value of MSRs. The model uses loan prepayment assumptions based on current market conditions and applies a discount rate based on indicated rates of return required by market participants. The increase in the valuation allowance during the nine months ended September 30, 2020 was caused by faster loan prepayment speeds attributable to the drop in interest rates on residential mortgage loans during the period. L osses applicable to write-downs of impaired loans and foreclosed real estate are based on the appraised value of the underlying collateral less estimated costs to sell. The losses on impaired loans are not recorded directly as an adjustment to current earnings, but rather as a component in determining the allowance for loan losses. The losses on foreclosed real estate represent adjustments in valuation recorded during the time period indicated and not for losses incurred on sales. Appraised values are typically based on a blend of (a) an income approach using observable cash flows to measure fair value, and (b) a market approach using observable market comparisons. These appraised values may be discounted based on management’s historical knowledge, expertise or changes in market conditions from time of valuation. There were no liabilities measured at fair value on a non-recurring basis at September 30, 2020 and December 31, 2019. Summary of fair values of financial instruments The estimated fair values, and related carrying amounts, of the Company’s financial instruments are presented below. Certain financial instruments and all non-financial instruments are exempt from disclosure requirements. Accordingly, the aggregate fair value amounts presented herein do not represent the underlying fair value of the Company. This table excludes financial instruments for which the carrying amount approximates fair value. Financial assets for which the fair value approximates carrying value include cash and cash equivalents, and accrued interest receivable. Financial liabilities for which the fair value approximates carrying value include mortgagors’ escrow accounts and accrued interest payable. September 30, 2020 Carrying Fair Amount Value Level 1 Level 2 Level 3 (In thousands) Financial assets: Securities available for sale 55,551 55,551 — 55,551 — Loans held for sale 87,805 87,805 — 87,805 — Loans, net 484,548 483,956 — — 483,956 Derivative assets 12,088 12,088 — 12,088 — Financial liabilities: Deposits $ 522,285 $ 522,970 $ — $ 522,970 $ — FRB advances 15,318 15,318 — 15,318 — FHLBB advances 66,903 68,204 — 68,204 — Derivative liabilities 924 924 — 924 — December 31, 2019 Carrying Fair Amount Value Level 1 Level 2 Level 3 (In thousands) Financial assets: Certificates of deposit $ 490 $ 492 $ — $ 492 $ — Securities available for sale 57,503 57,503 — 57,503 — Loans held for sale 62,792 62,792 — 62,792 — Loans, net 469,131 469,416 — — 469,416 Derivative assets 1,483 1,483 — 1,483 — Financial liabilities: Deposits $ 497,042 496,979 $ — $ 496,979 $ — FRB Advances — — — — — FHLBB advances 44,403 44,433 — 44,433 — Derivative liabilities 140 140 — 140 —

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2020
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	15. COMMITMENTS AND CONTINGENCIES 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. These instruments involve, to varying degrees, elements of market, credit and interest rate risk which are not recognized in the unaudited 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 and conditional obligations as it does for on-balance-sheet instruments. The following financial instruments were outstanding, at the dates indicated, whose contract amounts represent credit risk: September 30, 2020 December 31, 2019 (In thousands) Commitments to originate loans $ 439,452 $ 117,086 Unused lines and letters of credit 66,997 52,721 Unadvanced funds on construction loans 7,192 11,029 Overdraft lines of credit 8,004 8,178 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The commitments for 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 creditworthiness on a case-by-case basis. The majority of these financial instruments are collateralized by real estate. Other contingencies The Company is not currently a party to any pending legal proceedings that it believes would have a material adverse effect on its financial condition, results of operations or cash flows.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Segment Information	1 6 . SEGMENT INFORMATION The Company reports its activities in one of two business segments, namely Envision Bank (“EB”) and Envision Mortgage (“EM”). Envision Bank operations primarily consist of accepting deposits from customers within the communities surrounding the Bank’s five full-service branch offices and investing those funds in residential and commercial real estate loans, home equity lines of credit, construction loans, commercial and industrial loans, and consumer loans. Envision Mortgage’s operations primarily consist of the origination and sale of residential mortgage loans and the servicing of loans sold to government-sponsored entities. A portion of the loans originated by Envision Mortgage are held in the loan portfolio of Envision Bank. Segment information as of and for the three and nine months ended September 30, 2020 follows: For the Three Months Ended September 30, 2020 Envision Bank Envision Mortgage Consolidated Total (in thousands) Net interest income $ 4,032 $ 637 $ 4,669 Provision for loan losses 546 — 546 Net interest income after provision for loan losses 3,486 637 4,123 Non-interest income: Customer service fees 309 21 330 Gain on loan origination and sale activities, net (1) — 18,459 18,459 Mortgage servicing fees, net (98 ) 1,278 1,180 Other 93 169 262 Total non-interest income 304 19,927 20,231 Non-interest expenses: Salaries and employee benefits 1,959 5,952 7,911 Occupancy and equipment 437 422 859 Other non-interest expenses 1,084 1,197 2,281 Total non-interest expenses 3,480 7,571 11,051 Income (loss) before income taxes and elimination of inter-segment profit $ 310 $ 12,993 13,303 Elimination of inter-segment profit (357 ) Income before income taxes 12,946 Income tax expense 2,661 Net income $ 10,285 Total assets, September 30, 2020 $ 573,003 $ 149,965 $ 722,968 For the Nine Months Ended September 30, 2020 Envision Bank Envision Mortgage Consolidated Total (in thousands) Net interest income $ 11,970 $ 1,857 $ 13,827 Provision for loan losses 2,338 — 2,338 Net interest income after provision for loan losses 9,632 1,857 11,489 Non-interest income: Customer service fees 827 75 902 Gain on loan origination and sale activities, net (1) — 40,667 40,667 Mortgage servicing fees, net (281 ) (1,147 ) (1,428 ) Other 318 416 734 Total non-interest income 864 40,011 40,875 Non-interest expenses: Salaries and employee benefits (2) 6,983 17,456 24,439 Occupancy and equipment 1,305 1,090 2,395 Other non-interest expenses 3,286 3,269 6,555 Total non-interest expenses 11,574 21,815 33,389 Income (loss) before income taxes and elimination of inter-segment profit $ (1,078 ) $ 20,053 18,975 Elimination of inter-segment profit (1,051 ) Income before income taxes 17,924 Income tax expense 3,266 Net income $ 14,658 (3) Before elimination of inter-segment profit. (4) Salaries and benefits for the nine months ended September 30, 2020, include the severance and vested stock acceleration costs related to the retirement of the Chief Executive Officer and Chief Financial Officer of the Bank. Total cost of this event was $1.38 million, of which $1.03 million was allocated to the Bank segment and the remainder, $344,000, was allocated to the mortgage segment. The information above was derived from the internal management reporting system used by management to measure performance of the segments. The Company’s internal transfer pricing arrangements determined by management primarily consist of the following: 1. EM’s cost of funds is based on the weighted average rate of overnight advances from the Federal Home Loan Bank of Boston (“FHLBB”) for the period. 2. EM is credited with service released premiums and a sales premium totaling 1.50% for new loans transferred to EB’s loans held for investment, and a 1.00% fee for Home Equity Line of Credit (“HELOC”) originations. This income for the three and nine months ended September 30, 2020 totaled $357,000 and $1,052,000, respectively 3. Loan servicing fees are charged to EB by EM based on the number of residential mortgage loans held in portfolio at a rate of 0.14% per annum and amounted to $98,000 and $281,000 for the three and nine months ended September 30, 2020 4. Certain cost centers provide services to both business segments. The cost centers include Finance, Marketing, IT and Administration. Costs which are common to both business segments are referred to as “indirect costs” and are allocated using relevant benchmarks, e.g. headcount, number of accounts, etc. Segment information as of and for the three and nine months ended September 30, 2019 follows: For the Three Months Ended September 30, 2019 Envision Bank Envision Mortgage Consolidated Total (in thousands) Net interest income $ 3,781 $ 792 $ 4,573 Provision for loan losses — — — Net interest income after provision for loan losses 3,781 792 4,573 Non-interest income: Customer service fees 331 32 363 Gain on loan origination and sale activities, net (1) — 6,010 6,010 Mortgage servicing fees, net (93 ) (88 ) (181 ) Other 242 97 339 Total non-interest income 480 6,051 6,531 Non-interest expenses: Salaries and employee benefits 1,966 5,044 7,010 Occupancy and equipment 367 306 673 Other non-interest expenses 1,184 851 2,035 Total non-interest expenses 3,517 6,201 9,718 Income before income taxes and elimination of inter-segment profit $ 744 $ 642 1,386 Elimination of inter-segment profit (228 ) Income before income taxes 1,158 Income tax expense 14 Net income $ 1,144 Total assets, September 30, 2019 $ 509,021 $ 132,417 $ 641,438 For the Nine Months Ended September 30, 2019 Envision Bank Envision Mortgage Consolidated Total (in thousands) Net interest income $ 12,121 $ 1,319 $ 13,440 Credit for loan losses (144 ) — (144 ) Net interest income after credit for loan losses 12,265 1,319 13,584 Non-interest income: Customer service fees 948 106 1,054 Gain on loan origination and sale activities, net (1) — 14,043 14,043 Mortgage servicing fees, net (273 ) 635 362 Other 464 253 717 Total non-interest income 1,139 15,037 16,176 Non-interest expenses: Salaries and employee benefits 5,292 13,222 18,514 Occupancy and equipment 1,137 835 1,972 Other non-interest expenses 3,434 2,539 5,973 Total non-interest expenses 9,863 16,596 26,459 Income (loss) before income taxes and elimination of inter-segment profit $ 3,541 $ (240 ) 3,301 Elimination of inter-segment profit (605 ) Income before income taxes 2,696 Income tax expense 97 Net income $ 2,599 (1) Before elimination of inter-segment profit. The information above was derived from the internal management reporting system used by management to measure performance of the segments. The Company’s internal transfer pricing arrangements determined by management primarily consist of the following: 1. EM’s cost of funds is based on the weighted average rate of overnight advances from the FHLBB for the period. 2. EM is credited with service released premiums and a sales premium totaling 1.50% for new loans transferred to EB’s loans held for investment, and a 1.00% fee for HELOC originations. This income for the three and nine months ended September 30, 2019 totaled $228,000 and $605,000, respectively. 3. Loan servicing fees are charged to EB by EM based on the number of residential mortgage loans held in portfolio at a rate of 0.14% per annum and amounted to $93,000 and $273,000 for the three and nine months ended September 30, 2019, respectively. 4. Certain cost centers provide services to both business segments. The cost centers include Finance, Marketing, IT and Administration. Costs which are common to both business segments are referred to as “indirect costs” and are allocated using relevant benchmarks, e.g. headcount, number of accounts, etc.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	1 7 . SUBSEQUENT EVENTS On October 27, 2020, the Company announced that its Board of Directors has approved a share repurchase program to purchase up to 552,000 shares of its common stock, representing approximately 10.0% of the Company’s outstanding common stock. Repurchases under this program may be made in open market transactions. The timing and actual number of shares repurchased will depend on a variety of factors including price, corporate and regulatory requirements, market conditions, and other corporate liquidity requirements and priorities. The repurchase program does not obligate the Company to purchase any particular number of shares. The repurchase program will expire on October 29, 2021, and may be suspended or terminated at any time.

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Recent Accounting Pronouncements	In February 2016, FASB issued ASU 2016-02, Leases In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses

Global Pandemic Affecting Ran_2

Global Pandemic Affecting Randolph Bancorp, Inc. (Tables)	9 Months Ended
	Sep. 30, 2020
Summary of Loan Portfolio	A summary of the loan portfolio is as follows: September 30, 2020 December 31, 2019 (In thousands) Real estate loans: Residential: One-to-four family $ 235,955 $ 244,711 Home equity loans and lines of credit 48,097 41,669 Commercial 141,862 125,405 Construction 32,064 35,485 457,978 447,270 Commercial and industrial 20,388 9,093 Consumer 11,696 15,641 Total loans 490,062 472,004 Allowance for loan losses (6,597 ) (4,280 ) Net deferred loan costs and fees, and purchase premiums 1,083 1,407 $ 484,548 $ 469,131
Schedule of Past Due and Non-Accrual Loans	The following is a summary of past due and non-accrual loans at September 30, 2020 and December 31, 2019: 30 - 59 Days Past Due 60 - 89 Days Past Due 90 Days or More Past Due Total Past Due Non-accrual Loans (In thousands) September 30, 2020 Residential one-to-four family $ 267 $ 246 $ 582 $ 1,095 $ 2,215 Home equity loans and lines of credit — 66 — 66 582 Commercial real estate — — — — 6,986 Construction — — — — — Commercial and industrial — — — — 33 Consumer — — — — — Total $ 267 $ 312 $ 582 $ 1,161 $ 9,816 December 31, 2019 Residential one-to-four family $ 215 $ 587 $ — $ 802 $ 2,922 Home equity loans and lines of credit 188 244 — 432 336 Commercial real estate — — — — — Construction — — — — — Commercial and industrial — — — — — Consumer 76 11 — 87 — Total $ 479 $ 842 $ — $ 1,321 $ 3,258
Loan Payment Deferral and Paycheck Protection Program [Member]
Summary of Loan Portfolio	The table below summarizes the status of the bank’s loan deferral activity at September 30, 2020: Deferrals Suspended/ Resumed Full Granted Reduced Payment Payment Payoff (In thousands) September 30, 2020 Real estate loans: Residential: One-to-four family $ 14,902 $ 5,270 $ 8,825 $ 807 Home equity loans and lines of credit 2,984 1,314 1,670 - Commercial 33,286 19,287 13,999 - Total real estate loans 51,172 25,871 24,494 807 Commercial and industrial 3,710 33 1,830 1,847 Consumer 20 - 20 - Total $ 54,902 $ 25,904 $ 26,344 $ 2,654
Schedule of Past Due and Non-Accrual Loans	Accordingly, the table below summarizes the risk rating and for all loans that were granted deferral, and any loans that were listed in nonaccrual status at September 30, 2020: Pass Rated / Special Sub- Non- Not Rated Mention standard (1) accrual (1) (2) (In thousands) September 30, 2020 Real estate loans: Residential: One-to-four family $ 13,071 $ 778 $ 246 $ 196 Home equity loans and lines of credit 2,984 - - - Commercial 19,451 5,378 8,457 6,986 Total real estate loans 35,506 6,156 8,703 7,182 Commercial and industrial 1,378 452 33 33 Consumer 20 - - - Total $ 36,904 $ 6,608 $ 8,736 $ 7,215 (1) Includes one commercial real estate relationship for which a $2.8 million full repayment was made in early October 2020. (2) Nonaccrual loans are risk rated as either special mention or substandard and are included as a balance in those columns.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Components of Accumulated Other Comprehensive Income (Loss) and Related Tax Effects	The components of accumulated other comprehensive income (loss), included in total stockholders’ equity, are as follows: September 30, December 31, 2020 2019 (In thousands) Securities available for sale: Net unrealized gain $ 1,780 $ 167 Tax effect (313 ) (313 ) Net-of-tax amount 1,467 (146 ) Supplemental retirement plan Unrecognized net actuarial loss (625 ) (652 ) Unrecognized net prior service credit 275 311 (350 ) (341 ) Tax effect (47 ) (47 ) Net-of-tax amount (397 ) (388 ) Accumulated other comprehensive income (loss) $ 1,070 $ (534 )

Securities Available for Sale (

Securities Available for Sale (Tables)	9 Months Ended
	Sep. 30, 2020
Investments Debt And Equity Securities [Abstract]
Schedule of Amortized Cost and Fair Value of Securities	The amortized cost and fair value of securities available for sale, including gross unrealized gains and losses, are as follows: Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value (In thousands) September 30, 2020 Debt securities: Corporate 4,319 24 (7 ) 4,336 Municipal 744 6 — 750 Residential mortgage-backed securities: U.S. Government-sponsored enterprises 34,190 974 — 35,164 Commercial mortgage-backed securities: U.S. Government-sponsored enterprises 8,887 551 — 9,438 U.S. Government-guaranteed 1,023 24 — 1,047 Collateralized mortgage obligations: U.S. Government-sponsored enterprises 1,049 58 — 1,107 U.S. Government-guaranteed 3,559 150 — 3,709 Total securities available for sale $ 53,771 $ 1,787 $ (7 ) $ 55,551 December 31, 2019 Debt securities: U.S. Government-sponsored enterprises $ 4,000 $ 13 $ (1 ) $ 4,012 Corporate 1,513 15 — 1,528 Municipal 744 9 — 753 Residential mortgage-backed securities: U.S. Government-sponsored enterprises 35,238 458 (286 ) 35,410 Commercial mortgage-backed securities: U.S. Government-sponsored enterprises 8,977 — (53 ) 8,924 U.S. Government-guaranteed 1,363 7 — 1,370 Collateralized mortgage obligations: U.S. Government-sponsored enterprises 1,395 23 — 1,418 U.S. Government-guaranteed 4,106 10 (28 ) 4,088 Total securities available for sale $ 57,336 $ 535 $ (368 ) $ 57,503
Investments Classified by Contractual Maturity Date	The amortized cost and fair value of debt securities by contractual maturity at September 30, 2020 are presented below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Fair Cost Value (In thousands) Within 1 year $ 505 $ 510 After 1 year through 5 years 3,486 3,511 After 5 years through 10 years 1,072 1,065 5,063 5,086 Mortgage-backed securities 48,708 50,465 $ 53,771 $ 55,551
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	Information pertaining to securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous loss position, follows: Less Over Twelve Months Gross Gross Unrealized Fair Unrealized Fair Losses Value Losses Value September 30, 2020 (In thousands) Corporate $ (7 ) $ 1,065 $ — $ — December 31, 2019 U.S. Government-sponsored enterprises $ — $ — $ (1 ) $ 1,999 Residential mortgage-backed securities: U.S. Government-sponsored enterprises (123 ) 11,256 (163 ) 9,632 Commercial mortgage-backed securities: U.S. Government-sponsored enterprises (53 ) 8,924 — — Collateralized mortgage obligations: U.S. Government-guaranteed (15 ) 1,891 (13 ) 883 Total $ (191 ) $ 22,071 $ (177 ) $ 12,514

Loans and Allowance for Loan _2

Loans and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Summary of Loan Portfolio	A summary of the loan portfolio is as follows: September 30, 2020 December 31, 2019 (In thousands) Real estate loans: Residential: One-to-four family $ 235,955 $ 244,711 Home equity loans and lines of credit 48,097 41,669 Commercial 141,862 125,405 Construction 32,064 35,485 457,978 447,270 Commercial and industrial 20,388 9,093 Consumer 11,696 15,641 Total loans 490,062 472,004 Allowance for loan losses (6,597 ) (4,280 ) Net deferred loan costs and fees, and purchase premiums 1,083 1,407 $ 484,548 $ 469,131
Summary of Activity in the Allowance for Loan Losses by Loan Category	The following table s present activity in the allowance for loan losses by loan category for the three and nine months ended September 30, 2020 and 2019 , and allocation of the allowance to each category as of September 30, 2020 and December 31, 2019 : Residential 1-4 Family Second Mortgages and HELOC Commercial Real Estate Construction Commercial and Industrial Consumer Total (In thousands) Three Months Ended September 30, 2020 Allowance at June 30, 2020 $ 1,553 $ 378 $ 2,766 $ 897 $ 319 $ 146 $ 6,059 Provision (credit) for loan losses 30 77 589 (90 ) (75 ) 15 546 Loans charged-off — (3 ) — — — (8 ) (11 ) Recoveries — — — — 2 1 3 Balance at September 30, 2020 $ 1,583 $ 452 $ 3,355 $ 807 $ 246 $ 154 $ 6,597 Three Months Ended September 30, 2019 Allowance at June 30, 2019 $ 1,018 $ 297 $ 1,625 $ 755 $ 264 $ 195 $ 4,154 Provision (credit) for loan losses 43 (6 ) 22 (30 ) 6 (35 ) — Loans charged-off — — — — — (3 ) (3 ) Recoveries 2 — — — — - 2 Balance at September 30, 2019 $ 1,063 $ 291 $ 1,647 $ 725 $ 270 $ 157 $ 4,153 Nine Months Ended September 30, 2020 Allowance at December 31, 2019 $ 1,096 $ 289 $ 1,840 $ 692 $ 235 $ 128 $ 4,280 Provision for loan losses 480 166 1,515 115 9 53 2,338 Loans charged-off — (3 ) — — — (37 ) (40 ) Recoveries 7 — — — 2 10 19 Balance at September 30, 2020 $ 1,583 $ 452 $ 3,355 $ 807 $ 246 $ 154 $ 6,597 Nine Months Ended September 30, 2019 Allowance at December 31, 2018 $ 1,092 $ 292 $ 1,648 $ 765 $ 265 $ 375 $ 4,437 Provision (credit) for loan losses (52 ) (1 ) (1 ) (40 ) 5 (55 ) (144 ) Loans charged-off — — — — — (171 ) (171 ) Recoveries 23 — — — — 8 31 Balance at September 30, 2019 $ 1,063 $ 291 $ 1,647 $ 725 $ 270 $ 157 $ 4,153
Summary of Additional Information Pertaining to the Allowance for Loan Losses	Additional information pertaining to the allowance for loan losses at September 30, 2020 and December 31, 2019 is as follows: Residential 1-4 Family Second Mortgages and HELOC Commercial Real Estate Construction Commercial and Industrial Consumer Total September 30, 2020 (In thousands) Allowance for impaired loans $ 79 $ — $ — $ — $ — $ — $ 79 Allowance for non-impaired loans 1,504 452 3,355 807 246 154 6,518 Total allowance for loan losses $ 1,583 $ 452 $ 3,355 $ 807 $ 246 $ 154 $ 6,597 Impaired loans $ 4,581 $ 607 $ 7,028 $ — $ 33 $ — $ 12,249 Non-impaired loans 231,374 47,490 134,834 32,064 20,355 11,696 477,813 Total loans $ 235,955 $ 48,097 $ 141,862 $ 32,064 $ 20,388 $ 11,696 $ 490,062 December 31, 2019 Allowance for impaired loans $ 116 $ — $ — $ — $ — $ — $ 116 Allowance for non-impaired loans 980 289 1,840 692 235 128 4,164 Total allowance for loan losses $ 1,096 $ 289 $ 1,840 $ 692 $ 235 $ 128 $ 4,280 Impaired loans $ 5,640 $ 407 $ 46 $ — $ — $ — $ 6,093 Non-impaired loans 239,071 41,262 125,359 35,485 9,093 15,641 465,911 Total loans $ 244,711 $ 41,669 $ 125,405 $ 35,485 $ 9,093 $ 15,641 $ 472,004
Schedule of Past Due and Non-Accrual Loans	The following is a summary of past due and non-accrual loans at September 30, 2020 and December 31, 2019: 30 - 59 Days Past Due 60 - 89 Days Past Due 90 Days or More Past Due Total Past Due Non-accrual Loans (In thousands) September 30, 2020 Residential one-to-four family $ 267 $ 246 $ 582 $ 1,095 $ 2,215 Home equity loans and lines of credit — 66 — 66 582 Commercial real estate — — — — 6,986 Construction — — — — — Commercial and industrial — — — — 33 Consumer — — — — — Total $ 267 $ 312 $ 582 $ 1,161 $ 9,816 December 31, 2019 Residential one-to-four family $ 215 $ 587 $ — $ 802 $ 2,922 Home equity loans and lines of credit 188 244 — 432 336 Commercial real estate — — — — — Construction — — — — — Commercial and industrial — — — — — Consumer 76 11 — 87 — Total $ 479 $ 842 $ — $ 1,321 $ 3,258
Summary of Impaired Loans and Additional Information Pertaining to Impaired Loans	The following is a summary of impaired loans at September 30, 2020 and December 31, 2019: Recorded Investment Unpaid Principal Balance Related Allowance (In thousands) September 30, 2020 Impaired loans without a valuation allowance: Residential one-to-four family $ 3,636 $ 3,660 Home equity loans and lines of credit 607 607 Commercial real estate 7,028 7,028 Commercial and industrial 33 33 Total 11,304 11,328 Impaired loans with a valuation allowance: Residential one-to-four family 945 959 $ 79 945 959 79 Total impaired loans $ 12,249 $ 12,287 $ 79 December 31, 2019 Impaired loans without a valuation allowance: Residential one-to-four family $ 3,322 $ 3,322 Home equity loans and lines of credit 407 407 Commercial real estate 46 46 Total 3,775 3,775 Impaired loans with a valuation allowance: Residential one-to-four family 2,318 2,318 $ 116 Total 2,318 2,318 116 Total impaired loans $ 6,093 $ 6,093 $ 116 Additional information pertaining to impaired loans follows: Average Interest Cash Basis Recorded Income Interest Investment Recognized Recognized (In thousands) Three Months Ended September 30, 2020 Residential one-to-four family $ 4,630 $ 144 $ 61 Home equity loans and lines of credit 607 25 — Commercial real estate 7,028 — — Consumer 33 — — Total $ 12,298 $ 169 $ 61 Three Months Ended September 30, 2019 Residential one-to-four family $ 5,497 $ 49 $ 12 Home equity loans and lines of credit 369 1 — Commercial real estate 84 2 — Consumer 33 — — Total $ 5,983 $ 52 $ 12 Nine Months Ended September 30, 2020 Residential one-to-four family $ 4,563 $ 277 $ 131 Home equity loans and lines of credit 559 27 — Commercial real estate 4,713 — — Consumer 15 — — Total $ 9,850 $ 304 $ 131 Nine Months Ended September 30, 2019 Residential one-to-four family $ 5,586 $ 175 $ 63 Home equity loans and lines of credit 414 10 10 Commercial real estate 153 4 — Consumer 43 1 — Total $ 6,196 $ 190 $ 73
Summary of Company's Loans by Risk Rating	The following table presents the Company’s loans by risk rating at the dates indicated: September 30, 2020 December 31, 2019 Commercial Real Construction Commercial and Industrial Commercial Real Construction Commercial and Industrial (In thousands) Loans rated 1 - 3B (Pass rated) $ 127,298 $ 32,064 $ 19,903 $ 121,703 $ 35,485 $ 8,134 Loans rated 4 6,107 — 452 3,702 — 206 Loans rated 5 8,457 — 33 — — 753 $ 141,862 $ 32,064 $ 20,388 $ 125,405 $ 35,485 $ 9,093

Loan Servicing (Tables)

Loan Servicing (Tables)	9 Months Ended
	Sep. 30, 2020
Transfers And Servicing [Abstract]
Summary of Activity Relating to Mortgage Servicing Rights	The following table summarizes the activity relating to mortgage servicing rights (“MSRs”) for the three and nine months ended For the Three Months Ended For the Nine Months Ended September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 (In thousands) Mortgage servicing rights: Balance at beginning of period $ 12,090 $ 8,322 $ 9,484 $ 7,794 Additions through originations 2,570 1,115 6,131 2,215 Amortization (807 ) (334 ) (1,762 ) (906 ) Balance at end of period $ 13,853 $ 9,103 $ 13,853 $ 9,103 Valuation allowance: Balance at beginning of period $ 3,996 $ 121 $ 928 $ 8 Provision (release) (1,087 ) 523 1,981 636 Balance at end of period $ 2,909 $ 644 $ 2,909 $ 644 Amortized cost, net $ 10,944 $ 8,459 $ 10,944 $ 8,459 Fair value $ 11,014 $ 8,549 $ 11,014 $ 8,549

Earnings (Loss) Per Share (Tabl

Earnings (Loss) Per Share (Tables)	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Schedule of Calculation of Average Number of Shares Outstanding Used to Calculate Basic and Diluted Earnings (Loss) Per Share	The following table sets forth the calculation of the average number of shares outstanding used to calculate the basic and diluted earnings per share for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Average number of common shares outstanding 5,503,020 5,747,207 5,511,028 5,835,455 Less: Average unallocated ESOP shares (382,653 ) (401,421 ) (387,323 ) (406,116 ) Average number of common shares outstanding used to calculate basic earnings per share 5,120,367 5,345,786 5,123,705 5,429,339 Effect of dilutive stock options — — 2,372 — Average number of common shares outstanding used to calculate dilutive earnings per share 5,120,367 5,345,786 5,126,077 5,429,339

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Grants of Options to Purchase Shares of Common Stock	During the nine months ended September 30, 2020 and 2019, the Company made the following grants of options to purchase shares of common stock and used the following assumptions in measuring the fair value of such grants: 2020 2019 Options granted 330,118 57,252 Vesting period (years) 3-5 1-5 Expiration period (years) 10 10 Expected volatility 27.65 % 29.87 % Expected life (years) 6.2 6.5 Expected dividend yield — — Risk free interest rate 0.45% - 1.10% 2.37% - 2.61% Option fair value $2.69 - $4.32 $2.99 - $5.83
Summary of Stock Options Activity	A summary of stock option activity for the nine months ended September 30, 2020 is presented in the table below: Options Stock Option Grants Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Balance at January 1, 2020 360,207 $ 14.82 7.26 $ — Granted 330,118 12.14 Forfeited (14,543 ) 15.34 Expired (91,614 ) 14.67 Balance at September 30, 2020 584,168 $ 13.32 8.65 $ 357,681 Exercisable at September 30, 2020 101,993 $ 14.92 7.27 $ — Unrecognized compensation cost (inclusive of directors' options) $ 1,533,857 Weighted average remaining recognition period (years) 3.20
Summary of Activity in Restricted Stock Awards Under Equity Plan	The following table presents the activity in restricted stock awards under the Equity Plan for the nine months ended September 30, 2020: Restricted Stock Awards Weighted Average Grant Price Restricted stock awards at January 1, 2020 125,861 $ 14.76 Granted 63,130 10.84 Vested (41,380 ) 14.72 Forfeited (9,251 ) 14.88 Restricted stock awards at September 30, 2020 138,360 $ 12.97 Unrecognized compensation cost $ 1,421,896 Weighted average remaining recognition period (years) 3.40

Fair Value of Assets and Liab_2

Fair Value of Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Recorded at Fair Value on a Recurring Basis	Assets and liabilities recorded at fair value on a recurring basis are summarized below. Total Level 1 Level 2 Level 3 Fair (In thousands) September 30, 2020 Assets: Securities available for sale $ — $ 55,551 $ — $ 55,551 Portfolio loans (fair value option) — 14,384 — 14,384 Loans held for sale (fair value option) — 87,805 — 87,805 Derivative loan commitments — 11,967 — 11,967 Forward loan sale commitments — 121 — 121 Liabilities: Forward loan sale commitments, including TBAs — 924 — 924 December 31, 2019 Assets: Securities available for sale $ — $ 57,503 $ — $ 57,503 Portfolio loans (fair value option) — 9,826 — 9,826 Loans held for sale (fair value option) — 62,792 — 62,792 Derivative loan commitments — 1,472 — 1,472 Forward loan sale commitments — 11 — 11 Liabilities: Forward loan sale commitments, including TBAs — 140 — 140
Schedule of Assets Recorded at Fair Value on a Non-Recurring Basis	The following table summarizes the fair value hierarchy used to determine each adjustment and the carrying value of the related assets as of September 30, 2020 and December 31, 2019. Period Ended September 30, 2020 September 30, 2020 Level 1 Level 2 Level 3 Total Gains (Losses) (In thousands) Collateral dependent impaired loans $ — $ — $ 9,993 $ — Mortgage servicing rights — — 10,944 (1,981 ) Foreclosed real estate — — 132 — $ — $ — $ 21,069 $ (1,981 ) December 31, 2019 Level 1 Level 2 Level 3 (In thousands) Collateral dependent impaired loans $ — $ — $ 2,250 Mortgage servicing rights — — 8,556 $ — $ — $ 10,806
Summary of Carrying Values, Estimated Fair Values and Placement in Fair Value Hierarchy of Company's Financial Instruments	The estimated fair values, and related carrying amounts, of the Company’s financial instruments are presented below. Certain financial instruments and all non-financial instruments are exempt from disclosure requirements. Accordingly, the aggregate fair value amounts presented herein do not represent the underlying fair value of the Company. This table excludes financial instruments for which the carrying amount approximates fair value. Financial assets for which the fair value approximates carrying value include cash and cash equivalents, and accrued interest receivable. Financial liabilities for which the fair value approximates carrying value include mortgagors’ escrow accounts and accrued interest payable. September 30, 2020 Carrying Fair Amount Value Level 1 Level 2 Level 3 (In thousands) Financial assets: Securities available for sale 55,551 55,551 — 55,551 — Loans held for sale 87,805 87,805 — 87,805 — Loans, net 484,548 483,956 — — 483,956 Derivative assets 12,088 12,088 — 12,088 — Financial liabilities: Deposits $ 522,285 $ 522,970 $ — $ 522,970 $ — FRB advances 15,318 15,318 — 15,318 — FHLBB advances 66,903 68,204 — 68,204 — Derivative liabilities 924 924 — 924 — December 31, 2019 Carrying Fair Amount Value Level 1 Level 2 Level 3 (In thousands) Financial assets: Certificates of deposit $ 490 $ 492 $ — $ 492 $ — Securities available for sale 57,503 57,503 — 57,503 — Loans held for sale 62,792 62,792 — 62,792 — Loans, net 469,131 469,416 — — 469,416 Derivative assets 1,483 1,483 — 1,483 — Financial liabilities: Deposits $ 497,042 496,979 $ — $ 496,979 $ — FRB Advances — — — — — FHLBB advances 44,403 44,433 — 44,433 — Derivative liabilities 140 140 — 140 —

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2020
Commitments And Contingencies Disclosure [Abstract]
Summary of Financial Instruments Outstanding Contract Amounts Represent Credit Risk	The following financial instruments were outstanding, at the dates indicated, whose contract amounts represent credit risk: September 30, 2020 December 31, 2019 (In thousands) Commitments to originate loans $ 439,452 $ 117,086 Unused lines and letters of credit 66,997 52,721 Unadvanced funds on construction loans 7,192 11,029 Overdraft lines of credit 8,004 8,178

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Summary of Segment Information	Segment information as of and for the three and nine months ended September 30, 2020 follows: For the Three Months Ended September 30, 2020 Envision Bank Envision Mortgage Consolidated Total (in thousands) Net interest income $ 4,032 $ 637 $ 4,669 Provision for loan losses 546 — 546 Net interest income after provision for loan losses 3,486 637 4,123 Non-interest income: Customer service fees 309 21 330 Gain on loan origination and sale activities, net (1) — 18,459 18,459 Mortgage servicing fees, net (98 ) 1,278 1,180 Other 93 169 262 Total non-interest income 304 19,927 20,231 Non-interest expenses: Salaries and employee benefits 1,959 5,952 7,911 Occupancy and equipment 437 422 859 Other non-interest expenses 1,084 1,197 2,281 Total non-interest expenses 3,480 7,571 11,051 Income (loss) before income taxes and elimination of inter-segment profit $ 310 $ 12,993 13,303 Elimination of inter-segment profit (357 ) Income before income taxes 12,946 Income tax expense 2,661 Net income $ 10,285 Total assets, September 30, 2020 $ 573,003 $ 149,965 $ 722,968 For the Nine Months Ended September 30, 2020 Envision Bank Envision Mortgage Consolidated Total (in thousands) Net interest income $ 11,970 $ 1,857 $ 13,827 Provision for loan losses 2,338 — 2,338 Net interest income after provision for loan losses 9,632 1,857 11,489 Non-interest income: Customer service fees 827 75 902 Gain on loan origination and sale activities, net (1) — 40,667 40,667 Mortgage servicing fees, net (281 ) (1,147 ) (1,428 ) Other 318 416 734 Total non-interest income 864 40,011 40,875 Non-interest expenses: Salaries and employee benefits (2) 6,983 17,456 24,439 Occupancy and equipment 1,305 1,090 2,395 Other non-interest expenses 3,286 3,269 6,555 Total non-interest expenses 11,574 21,815 33,389 Income (loss) before income taxes and elimination of inter-segment profit $ (1,078 ) $ 20,053 18,975 Elimination of inter-segment profit (1,051 ) Income before income taxes 17,924 Income tax expense 3,266 Net income $ 14,658 (3) Before elimination of inter-segment profit. (4) Salaries and benefits for the nine months ended September 30, 2020, include the severance and vested stock acceleration costs related to the retirement of the Chief Executive Officer and Chief Financial Officer of the Bank. Total cost of this event was $1.38 million, of which $1.03 million was allocated to the Bank segment and the remainder, $344,000, was allocated to the mortgage segment. Segment information as of and for the three and nine months ended September 30, 2019 follows: For the Three Months Ended September 30, 2019 Envision Bank Envision Mortgage Consolidated Total (in thousands) Net interest income $ 3,781 $ 792 $ 4,573 Provision for loan losses — — — Net interest income after provision for loan losses 3,781 792 4,573 Non-interest income: Customer service fees 331 32 363 Gain on loan origination and sale activities, net (1) — 6,010 6,010 Mortgage servicing fees, net (93 ) (88 ) (181 ) Other 242 97 339 Total non-interest income 480 6,051 6,531 Non-interest expenses: Salaries and employee benefits 1,966 5,044 7,010 Occupancy and equipment 367 306 673 Other non-interest expenses 1,184 851 2,035 Total non-interest expenses 3,517 6,201 9,718 Income before income taxes and elimination of inter-segment profit $ 744 $ 642 1,386 Elimination of inter-segment profit (228 ) Income before income taxes 1,158 Income tax expense 14 Net income $ 1,144 Total assets, September 30, 2019 $ 509,021 $ 132,417 $ 641,438 For the Nine Months Ended September 30, 2019 Envision Bank Envision Mortgage Consolidated Total (in thousands) Net interest income $ 12,121 $ 1,319 $ 13,440 Credit for loan losses (144 ) — (144 ) Net interest income after credit for loan losses 12,265 1,319 13,584 Non-interest income: Customer service fees 948 106 1,054 Gain on loan origination and sale activities, net (1) — 14,043 14,043 Mortgage servicing fees, net (273 ) 635 362 Other 464 253 717 Total non-interest income 1,139 15,037 16,176 Non-interest expenses: Salaries and employee benefits 5,292 13,222 18,514 Occupancy and equipment 1,137 835 1,972 Other non-interest expenses 3,434 2,539 5,973 Total non-interest expenses 9,863 16,596 26,459 Income (loss) before income taxes and elimination of inter-segment profit $ 3,541 $ (240 ) 3,301 Elimination of inter-segment profit (605 ) Income before income taxes 2,696 Income tax expense 97 Net income $ 2,599 (1) Before elimination of inter-segment profit.

Global Pandemic Affecting Ran_3

Global Pandemic Affecting Randolph Bancorp, Inc.- Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Unusual Risk Or Uncertainty [Line Items]
Loans, allowance for loan losses	$ 6,597,000	$ 4,280,000
Disaster Response Plan Costs	229,000
Residential Real Estate Loan Serviced for Others [Member] | Deferral Payment Agreements [Member]
Unusual Risk Or Uncertainty [Line Items]
Loan, amount	66,800,000
Residential Real Estate Loans in Portfolio [Member] | Deferral Payment Agreements [Member]
Unusual Risk Or Uncertainty [Line Items]
Loan, amount	17,900,000
Commercial Loan [Member] | Deferral Payment Agreements [Member]
Unusual Risk Or Uncertainty [Line Items]
Loan, amount	37,000,000
Paycheck Protection Program
Unusual Risk Or Uncertainty [Line Items]
Loan, amount	15,400,000
Covid19
Unusual Risk Or Uncertainty [Line Items]
Loans, allowance for loan losses	$ 558,000

Global Pandemic Affecting Ran_4

Global Pandemic Affecting Randolph Bancorp, Inc. - Summary of Loan Portfolio (Detail) $ in Thousands	Sep. 30, 2020USD ($)
Financing Receivable Recorded Investment Past Due [Line Items]
Deferrals Granted	$ 54,902
Suspended/Reduction Payment	25,904
Resumed Payment	26,344
Full Payoff	2,654
Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Deferrals Granted	51,172
Suspended/Reduction Payment	25,871
Resumed Payment	24,494
Full Payoff	807
Residential Real Estate [Member] | One-to-Four Family [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Deferrals Granted	14,902
Suspended/Reduction Payment	5,270
Resumed Payment	8,825
Full Payoff	807
Residential Real Estate [Member] | Home Equity Loans and Lines of Credit [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Deferrals Granted	2,984
Suspended/Reduction Payment	1,314
Resumed Payment	1,670
Residential Real Estate [Member] | Commercial Real Estate Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Deferrals Granted	33,286
Suspended/Reduction Payment	19,287
Resumed Payment	13,999
Commercial and Industrial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Deferrals Granted	3,710
Suspended/Reduction Payment	33
Resumed Payment	1,830
Full Payoff	1,847
Consumer [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Deferrals Granted	20
Resumed Payment	$ 20

Global Pandemic Affecting Ran_5

Global Pandemic Affecting Randolph Bancorp, Inc. - Summary of Loan PortfolioSchedule of Past Due and Non-Accrual Loans (Detail) $ in Thousands	Sep. 30, 2020USD ($)
Financing Receivable Recorded Investment Past Due [Line Items]
Pass Rated / Not Rated	$ 36,904
Special Mention	6,608
Sub-standard	8,736
Non-accrual	7,215
Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Pass Rated / Not Rated	35,506
Special Mention	6,156
Sub-standard	8,703
Non-accrual	7,182
Residential Real Estate [Member] | One-to-Four Family [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Pass Rated / Not Rated	13,071
Special Mention	778
Sub-standard	246
Non-accrual	196
Residential Real Estate [Member] | Home Equity Loans and Lines of Credit [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Pass Rated / Not Rated	2,984
Residential Real Estate [Member] | Commercial Real Estate Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Pass Rated / Not Rated	19,451
Special Mention	5,378
Sub-standard	8,457
Non-accrual	6,986
Commercial and Industrial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Pass Rated / Not Rated	1,378
Special Mention	452
Sub-standard	33
Non-accrual	33
Consumer [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Pass Rated / Not Rated	$ 20

Global Pandemic Affecting Ran_6

Global Pandemic Affecting Randolph Bancorp, Inc. - Summary of Loan PortfolioSchedule of Past Due and Non-Accrual Loans (Parenthetical) (Detail) $ in Millions	Oct. 01, 2020USD ($)
Subsequent Event [Member] | Residential Real Estate [Member] | Commercial Real Estate Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Bank loan full repayment	$ 2.8

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss)	$ (111)	$ 247	$ 1,604	$ 1,617
Accumulated other comprehensive income (loss), net of tax	$ 1,070		1,070		$ (534)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gain			1,780		167
Other comprehensive Loss, Tax effect			(313)		(313)
Total other comprehensive income (loss)			1,467		(146)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gain			(625)		(652)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gain			275		311
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gain			(350)		(341)
Other comprehensive Loss, Tax effect			(47)		(47)
Total other comprehensive income (loss)			$ (397)		$ (388)

Securities Available for Sale -

Securities Available for Sale - Schedule of Amortized Cost and Fair Value of Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 53,771	$ 57,336
Gross Unrealized Gains	1,787	535
Gross Unrealized Losses	(7)	(368)
Fair Value	55,551	57,503
Debt Securities [Member] | Corporate [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,319	1,513
Gross Unrealized Gains	24	15
Gross Unrealized Losses	(7)
Fair Value	4,336	1,528
Debt Securities [Member] | Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	744	744
Gross Unrealized Gains	6	9
Fair Value	750	753
Debt Securities [Member] | Residential Mortgage-backed Securities, US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	34,190	35,238
Gross Unrealized Gains	974	458
Gross Unrealized Losses		(286)
Fair Value	35,164	35,410
Debt Securities [Member] | Commercial Mortgage-backed Securities, US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,887	8,977
Gross Unrealized Gains	551
Gross Unrealized Losses		(53)
Fair Value	9,438	8,924
Debt Securities [Member] | Commercial Mortgage Backed Securities, U.S. Government-guaranteed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,023	1,363
Gross Unrealized Gains	24	7
Fair Value	1,047	1,370
Debt Securities [Member] | Collateralized Mortgage Obligations, US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,049	1,395
Gross Unrealized Gains	58	23
Fair Value	1,107	1,418
Debt Securities [Member] | Collateralized Mortgage Obligations, US Government Guaranteed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,559	4,106
Gross Unrealized Gains	150	10
Gross Unrealized Losses		(28)
Fair Value	$ 3,709	4,088
Debt Securities [Member] | US Government-sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		4,000
Gross Unrealized Gains		13
Gross Unrealized Losses		(1)
Fair Value		$ 4,012

Securities Available for Sale_2

Securities Available for Sale - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2020USD ($)Debt_Security	Sep. 30, 2019USD ($)
Investments Debt And Equity Securities [Abstract]
Proceeds from sales of available-for-sale securities | $	$ 0	$ 0
Number of debt securities with unrealized losses | Debt_Security	1
Unrealized losses debt securities aggregate depreciation percentage	0.65%

Securities Available for Sale_3

Securities Available for Sale - Investments Classified by Contractual Maturity Date (Detail) $ in Thousands	Sep. 30, 2020USD ($)
Available-for-sale Securities, Debt Maturities, Amortized Cost
Within 1 year	$ 505
After 1 year through 5 years	3,486
After 5 years through 10 years	1,072
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Total	5,063
Mortgage-backed securities	48,708
Available-for-sale Debt Securities, Amortized Cost Basis, Total	53,771
Available-for-sale Securities, Debt Maturities, Fair Value
Within 1 year	510
After 1 year through 5 years	3,511
After 5 years through 10 years	1,065
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value Total	5,086
Mortgage-backed securities	50,465
Available-for-sale Securities, Debt Securities, Fair Value Total	$ 55,551

Securities Available for Sale_4

Securities Available for Sale - Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value (Detail) - Debt Securities [Member] - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Less Than Twelve Months, Gross Unrealized Losses		$ (191)
Less Than Twelve Months, Fair Value		22,071
Over Twelve Months, Gross Unrealized Losses		(177)
Over Twelve Months, Fair Value		12,514
Corporate [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than Twelve Months, Gross Unrealized Losses	$ (7)
Less Than Twelve Months, Fair Value	$ 1,065
US Government-sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Over Twelve Months, Gross Unrealized Losses		(1)
Over Twelve Months, Fair Value		1,999
Residential Mortgage-backed Securities, US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than Twelve Months, Gross Unrealized Losses		(123)
Less Than Twelve Months, Fair Value		11,256
Over Twelve Months, Gross Unrealized Losses		(163)
Over Twelve Months, Fair Value		9,632
Commercial Mortgage-backed Securities, US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than Twelve Months, Gross Unrealized Losses		(53)
Less Than Twelve Months, Fair Value		8,924
Collateralized Mortgage Obligations, US Government Guaranteed [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than Twelve Months, Gross Unrealized Losses		(15)
Less Than Twelve Months, Fair Value		1,891
Over Twelve Months, Gross Unrealized Losses		(13)
Over Twelve Months, Fair Value		$ 883

Loans and Allowance for Loan _3

Loans and Allowance for Loan Losses - Summary of Loan Portfolio (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 490,062	$ 472,004
Allowance for loan losses	(6,597)	(4,280)
Net deferred loan costs and fees, and purchase premiums	1,083	1,407
Loans, net	484,548	469,131
Real Estate Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	457,978	447,270
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	141,862	125,405
Commercial Real Estate Loans [Member] | Real Estate Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	141,862	125,405
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	20,388	9,093
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	11,696	15,641
One-to-Four Family [Member] | Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	235,955	244,711
One-to-Four Family [Member] | Residential Real Estate [Member] | Real Estate Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	235,955	244,711
Home Equity Loans and Lines of Credit [Member] | Residential Real Estate [Member] | Real Estate Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	48,097	41,669
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	32,064	35,485
Construction [Member] | Real Estate Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 32,064	$ 35,485

Loans and Allowance for Loan _4

Loans and Allowance for Loan Losses - Summary of Activity in the Allowance for Loan Losses by Loan Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 6,059	$ 4,154	$ 4,280	$ 4,437
Provision (credit) for loan losses	546		2,338	(144)
Loans charged-off	(11)	(3)	(40)	(171)
Recoveries	3	2	19	31
Ending balance	6,597	4,153	6,597	4,153
Commercial Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	2,766	1,625	1,840	1,648
Provision (credit) for loan losses	589	22	1,515	(1)
Ending balance	3,355	1,647	3,355	1,647
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	319	264	235	265
Provision (credit) for loan losses	(75)	6	9	5
Recoveries	2		2
Ending balance	246	270	246	270
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	146	195	128	375
Provision (credit) for loan losses	15	(35)	53	(55)
Loans charged-off	(8)	(3)	(37)	(171)
Recoveries	1		10	8
Ending balance	154	157	154	157
One-to-Four Family [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,553	1,018	1,096	1,092
Provision (credit) for loan losses	30	43	480	(52)
Recoveries		2	7	23
Ending balance	1,583	1,063	1,583	1,063
Second Mortgages and HELOC [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	378	297	289	292
Provision (credit) for loan losses	77	(6)	166	(1)
Loans charged-off	(3)		(3)
Ending balance	452	291	452	291
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	897	755	692	765
Provision (credit) for loan losses	(90)	(30)	115	(40)
Ending balance	$ 807	$ 725	$ 807	$ 725

Loans and Allowance for Loan _5

Loans and Allowance for Loan Losses - Summary of Additional Information Pertaining to the Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for impaired loans	$ 79		$ 116
Allowance for non-impaired loans	6,518		4,164
Total allowance for loan losses	6,597	$ 6,059	4,280	$ 4,153	$ 4,154	$ 4,437
Impaired loans	12,249		6,093
Non-impaired loans	477,813		465,911
Total loans	490,062		472,004
Commercial Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for non-impaired loans	3,355		1,840
Total allowance for loan losses	3,355	2,766	1,840	1,647	1,625	1,648
Impaired loans	7,028		46
Non-impaired loans	134,834		125,359
Total loans	141,862		125,405
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for non-impaired loans	246		235
Total allowance for loan losses	246	319	235	270	264	265
Impaired loans	33
Non-impaired loans	20,355		9,093
Total loans	20,388		9,093
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for non-impaired loans	154		128
Total allowance for loan losses	154	146	128	157	195	375
Non-impaired loans	11,696		15,641
Total loans	11,696		15,641
One-to-Four Family [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for impaired loans	79		116
Allowance for non-impaired loans	1,504		980
Total allowance for loan losses	1,583	1,553	1,096	1,063	1,018	1,092
Impaired loans	4,581		5,640
Non-impaired loans	231,374		239,071
Total loans	235,955		244,711
Second Mortgages and HELOC [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for non-impaired loans	452		289
Total allowance for loan losses	452	378	289	291	297	292
Impaired loans	607		407
Non-impaired loans	47,490		41,262
Total loans	48,097		41,669
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for non-impaired loans	807		692
Total allowance for loan losses	807	$ 897	692	$ 725	$ 755	$ 765
Non-impaired loans	32,064		35,485
Total loans	$ 32,064		$ 35,485

Loans and Allowance for Loan _6

Loans and Allowance for Loan Losses - Schedule of Past Due and Non-Accrual Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 1,161	$ 1,321
Non-accrual Loans	9,816	3,258
Commercial and Industrial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual Loans	33
Consumer [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		87
One-to-Four Family [Member] | Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,095	802
Non-accrual Loans	2,215	2,922
Home Equity Loans and Lines of Credit [Member] | Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	66	432
Non-accrual Loans	582	336
Commercial Real Estate Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual Loans	6,986
30 - 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	267	479
30 - 59 Days Past Due [Member] | Consumer [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		76
30 - 59 Days Past Due [Member] | One-to-Four Family [Member] | Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	267	215
30 - 59 Days Past Due [Member] | Home Equity Loans and Lines of Credit [Member] | Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		188
60 - 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	312	842
60 - 89 Days Past Due [Member] | Consumer [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		11
60 - 89 Days Past Due [Member] | One-to-Four Family [Member] | Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	246	587
60 - 89 Days Past Due [Member] | Home Equity Loans and Lines of Credit [Member] | Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	66	$ 244
90 Days or More Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	582
90 Days or More Past Due [Member] | One-to-Four Family [Member] | Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 582

Loans and Allowance for Loan _7

Loans and Allowance for Loan Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Recorded Investment without a valuation allowance	$ 11,304	$ 3,775
Unpaid Principal Balance without a valuation allowance	11,328	3,775
Recorded Investment with a valuation allowance	945	2,318
Unpaid Principal Balance with a valuation allowance	959	2,318
Related Allowance, Total impaired loans	79	116
Recorded Investment, Total impaired loans	12,249	6,093
Unpaid Principal Balance, Total impaired loans	12,287	6,093
Commercial Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment without a valuation allowance	7,028	46
Unpaid Principal Balance without a valuation allowance	7,028	46
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment without a valuation allowance	33
Unpaid Principal Balance without a valuation allowance	33
One-to-Four Family [Member] | Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment without a valuation allowance	3,636	3,322
Unpaid Principal Balance without a valuation allowance	3,660	3,322
Recorded Investment with a valuation allowance	945	2,318
Unpaid Principal Balance with a valuation allowance	959	2,318
Related Allowance, Total impaired loans	79	116
Home Equity Loans and Lines of Credit [Member] | Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment without a valuation allowance	607	407
Unpaid Principal Balance without a valuation allowance	$ 607	$ 407

Loans and Allowance for Loan _8

Loans and Allowance for Loan Losses - Summary of Additional Information Pertaining to Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 12,298	$ 5,983	$ 9,850	$ 6,196
Interest Income Recognized	169	52	304	190
Cash Basis Interest Recognized	61	12	131	73
Residential Real Estate [Member] | One-to-Four Family [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	4,630	5,497	4,563	5,586
Interest Income Recognized	144	49	277	175
Cash Basis Interest Recognized	61	12	131	63
Residential Real Estate [Member] | Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	607	369	559	414
Interest Income Recognized	25	1	27	10
Cash Basis Interest Recognized				10
Commercial Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	7,028	84	4,713	153
Interest Income Recognized		2		4
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 33	$ 33	$ 15	43
Interest Income Recognized				$ 1

Loans and Allowance for Loan _9

Loans and Allowance for Loan Losses - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)TDR	Sep. 30, 2019USD ($)TDR	Dec. 31, 2019USD ($)TDR
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans subject to troubled debt restructurings | TDR			0	5
Troubled debt restructuring amount			$ 2,875,000	$ 3,727,000
Allowances related to troubled debt restructurings	$ 0	$ 0	0	0
Trouble debt restructurings, additional funds committed	$ 0		0
Minimum past due days for loan rating	90 days
Total loans	$ 490,062,000		490,062,000		$ 472,004,000
Residential Mortgage [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,329,000		1,329,000		2,925,000
Residential Mortgage [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,715,000		1,715,000		1,293,000
30 - 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings defaulted over 30 days past due	0	$ 0	0
Non Accrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructuring amount			1,437,000	$ 1,563,000
Home Equity Loans and Lines of Credit [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	383,000		383,000		$ 336,000
Home Equity Loans and Lines of Credit [Member] | Residential Mortgage [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	198,000,000		$ 198,000,000
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans subject to troubled debt restructurings | TDR			16		19
Loans subject to troubled debt restructurings, amount	2,780,000		$ 2,780,000		$ 3,679,000
Residential Real Estate [Member] | Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructuring, interest rate concession period			3 months
Residential Real Estate [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructuring, interest rate concession period			30 years
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans subject to troubled debt restructurings | TDR			1		1
Loans subject to troubled debt restructurings, amount	42,000		$ 42,000		$ 48,000
Total loans	141,862,000		141,862,000		125,405,000
Commercial Real Estate Loans [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,457,000		8,457,000
Commercial Real Estate Loans [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 6,107,000		$ 6,107,000		$ 3,702,000
Commercial Real Estate Loans [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructuring, interest rate concession period			1 year
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans subject to troubled debt restructurings | TDR			1

Loans and Allowance for Loan_10

Loans and Allowance for Loan Losses - Summary of Company's Loans by Risk Rating (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 490,062	$ 472,004
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	32,064	35,485
Commercial Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	141,862	125,405
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	20,388	9,093
Pass [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	32,064	35,485
Pass [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	127,298	121,703
Pass [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	19,903	8,134
Special Mention [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,107	3,702
Special Mention [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	452	206
Substandard [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	8,457
Substandard [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 33	$ 753

Loan Servicing - Additional Inf

Loan Servicing - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Transfers And Servicing [Abstract]
Unpaid principal balances of residential mortgage loans serviced for others	$ 1,590,000,000		$ 1,050,000,000
Increase the valuation allowance of mortgage servicing rights	$ 1,981,000	$ 636,000

Loan Servicing - Summary of Act

Loan Servicing - Summary of Activity Relating to Mortgage Servicing Rights (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Mortgage servicing rights:
Balance at beginning of period	$ 12,090	$ 8,322	$ 9,484	$ 7,794
Additions through originations	2,570	1,115	6,131	2,215
Amortization	(807)	(334)	(1,762)	(906)
Balance at end of period	13,853	9,103	13,853	9,103
Valuation allowance:
Balance at beginning of period	3,996	121	928	8
Provision (release)	(1,087)	523	1,981	636
Balance at end of period	2,909	644	2,909	644
Amortized cost, net	10,944	8,459	10,944	8,459
Fair value	$ 11,014	$ 8,549	$ 11,014	$ 8,549

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Current state tax expense	$ 2,661,000		$ 3,266,000
Income tax expense	2,661,000	$ 14,000	3,266,000	$ 97,000
Deferred Tax Liability	$ 2,273,000		$ 2,273,000		$ 0
Valuation allowance for deferred tax assets					100.00%

On-Balance Sheet Derivative I_2

On-Balance Sheet Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Derivative Loan Commitments [Member]
Derivative [Line Items]
Derivative, Notional amount	$ 418,903,000	$ 89,925,000
Undesignated Forward Loan Sale Commitments and TBA Securities [Member]
Derivative [Line Items]
Derivative, Notional amount	372,429,000	85,401,000
Other Assets [Member] | Derivative Loan Commitments [Member]
Derivative [Line Items]
Derivative fair value, Asset	11,967,000	1,472,000
Other Assets [Member] | Undesignated Forward Loan Sale Commitments and TBA Securities [Member]
Derivative [Line Items]
Derivative fair value, Asset	121,000	11,000
Other Liabilities [Member] | Undesignated Forward Loan Sale Commitments and TBA Securities [Member]
Derivative [Line Items]
Derivative fair value, Liability	$ 924,000	$ 140,000

Employee Stock Ownership Plan -

Employee Stock Ownership Plan - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Employee Stock Ownership Plan E S O P Disclosures [Line Items]
Loan repaid term			25 years
Number of allocated shares	18,780		18,780
Annual allocation of shares, expiration year			2040
ESOP expense	$ 52,000	$ 65,000	$ 164,000	$ 203,000
Unallocated shares	380,319		380,319
Unallocated shares, value	$ 4,727,000		$ 4,727,000
Common Stock [Member] | Initial Public Offering [Member]
Employee Stock Ownership Plan E S O P Disclosures [Line Items]
Sale of stock, price per share	$ 10		$ 10
The Randolph Savings Charitable Foundation, Inc. [Member] | Initial Public Offering [Member]
Employee Stock Ownership Plan E S O P Disclosures [Line Items]
Sale of share in employee stock ownership plan			469,498

Share Repurchase Program - Addi

Share Repurchase Program - Additional Information (Detail) - shares	Oct. 27, 2020	Sep. 30, 2017
Class Of Stock [Line Items]
Stock repurchase program percentage of outstanding shares repurchased	10.00%
Number of shares authorized to repurchase	552,000
September 2017 Share Repurchase Program [Member]
Class Of Stock [Line Items]
Stock repurchase program percentage of outstanding shares repurchased		10.00%
Number of shares authorized to repurchase		586,854

Earnings (Loss) Per Share - Sch

Earnings (Loss) Per Share - Schedule of Calculation of Average Number of Shares Outstanding Used to Calculate Basic and Diluted Earnings (Loss) Per Share (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Average number of common shares outstanding	5,503,020	5,747,207	5,511,028	5,835,455
Less: Average unallocated ESOP shares	(382,653)	(401,421)	(387,323)	(406,116)
Average number of common shares outstanding used to calculate basic earnings per share	5,120,367	5,345,786	5,123,705	5,429,339
Effect of dilutive stock options			2,372
Average number of common shares outstanding used to calculate dilutive earnings per share	5,120,367	5,345,786	5,126,077	5,429,339

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)shares	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)Officershares	Sep. 30, 2019USD ($)
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option term			10 years	10 years
Stock-based compensation expense	$ 138,000	$ 79,000	$ 545,000	$ 271,000
Stock Options [Member] | Executive Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Amount attributable to accelerated vesting of units			$ 233,000
Number of officer | Officer			2
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 115,000	$ 144,000	$ 781,000	$ 410,000
Restricted Stock [Member] | Executive Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Amount attributable to accelerated vesting of units			$ 450,000
Number of officer | Officer			2
Minimum [Member] | Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options and awards vesting period			3 years	1 year
Maximum [Member] | Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options and awards vesting period			5 years	5 years
Two Thousand Seventeen Stock Option and Incentive Plan [Member] | Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for issuance | shares	586,872		586,872
Stock option term			10 years
Two Thousand Seventeen Stock Option and Incentive Plan [Member] | Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for issuance | shares	234,749		234,749
Two Thousand Seventeen Stock Option and Incentive Plan [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options and awards vesting period			3 years
Two Thousand Seventeen Stock Option and Incentive Plan [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options and awards vesting period			5 years

Stock Based Compensation - Summ

Stock Based Compensation - Summary of Grants of Options to Purchase Shares of Common Stock (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted	330,118	57,252
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiration period (years)	10 years	10 years
Expected volatility	27.65%	29.87%
Expected life (years)	6 years 2 months 12 days	6 years 6 months
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option fair value	$ 2.69	$ 2.99
Minimum [Member] | Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period (years)	3 years	1 year
Risk free interest rate, minimum	0.45%	2.37%
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option fair value	$ 4.32	$ 5.83
Maximum [Member] | Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period (years)	5 years	5 years
Risk free interest rate, maximum	1.10%	2.61%

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock Options Activity (Detail) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Stock Option Grants
Beginning Balance	360,207
Granted	330,118	57,252
Forfeited	(14,543)
Expired	(91,614)
Ending Balance	584,168		360,207
Exercisable at September 30, 2020	101,993
Unrecognized compensation cost (inclusive of directors' options)	$ 1,533,857
Weighted Average Exercise Price
Beginning Balance	$ 14.82
Granted	12.14
Forfeited	15.34
Expired	14.67
Ending Balance	13.32		$ 14.82
Exercisable at September 30, 2020	$ 14.92
Weighted Average Remaining Contractual Term and Aggregate Intrinsic Value
Weighted Average Remaining Contractual Term	8 years 7 months 24 days		7 years 3 months 3 days
Weighted Average Remaining Contractual Term, Exercisable	7 years 3 months 7 days
Aggregate Intrinsic Value, Outstanding	$ 357,681
Aggregate Intrinsic Value, Exercisable	$ 0
Stock Options [Member]
Stock Option Grants
Weighted average remaining recognition period (years)	3 years 2 months 12 days

Stock-Based Compensation - Su_2

Stock-Based Compensation - Summary of Activity in Restricted Stock Awards Under Equity Plan (Detail)	9 Months Ended
	Sep. 30, 2020USD ($)$ / sharesshares
Restricted Stock Awards
Beginning Balance | shares	125,861
Granted | shares	63,130
Vested | shares	(41,380)
Forfeited | shares	(9,251)
Ending Balance | shares	138,360
Unrecognized compensation cost | $	$ 1,421,896
Weighted Average Grant Price
Beginning Balance | $ / shares	$ 14.76
Granted | $ / shares	10.84
Vested | $ / shares	14.72
Forfeited | $ / shares	14.88
Ending Balance | $ / shares	$ 12.97
Restricted Stock [Member]
Restricted Stock Awards
Weighted average remaining recognition period (years)	3 years 4 months 24 days

Fair Value of Assets and Liab_3

Fair Value of Assets and Liabilities - Schedule of Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	$ 55,551	$ 57,503
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	55,551	57,503
Fair value, Loans held for sale	87,805	62,792
Derivative assets	12,088	1,483
Derivative liabilities	924	140
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, Portfolio loans	14,384	9,826
Fair value, Loans held for sale	87,805	62,792
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	55,551	57,503
Fair Value, Measurements, Recurring [Member] | Derivative Loan Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	11,967	1,472
Fair Value, Measurements, Recurring [Member] | Forward Loan Sale Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	121	11
Fair Value, Measurements, Recurring [Member] | Forward Loan Sale Commitments, including TBAs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	924	140
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, Portfolio loans	14,384	9,826
Fair value, Loans held for sale	87,805	62,792
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, at fair value	55,551	57,503
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Derivative Loan Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	11,967	1,472
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Forward Loan Sale Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	121	11
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Forward Loan Sale Commitments, including TBAs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	$ 924	$ 140

Fair Value of Assets and Liab_4

Fair Value of Assets and Liabilities - Additional information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, assets, level 1 to level 2 transfers, amount	$ 0	$ 0
Fair value, assets, level 2 to level 1 transfers, amount	0	0
Fair value, liabilities, level 1 to level 2 transfers, amount	0	0
Fair value, liabilities, level 2 to level 1 transfers, amount	0	0
Increase (decrease) in valuation allowance of mortgage servicing rights	1,981,000	$ 636,000
Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value on nonrecurring basis	$ 0		$ 0

Fair Value of Assets and Liab_5

Fair Value of Assets and Liabilities - Schedule of Assets Recorded at Fair Value on a Non-Recurring Basis (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights, fair value	$ 11,014		$ 8,549
Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gains (losses) on assets held, mortgage servicing rights	(1,981)
Gains (Losses) on assets held	(1,981)
Fair Value, Nonrecurring | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, Collateral dependent impaired loans	9,993	$ 2,250
Mortgage servicing rights, fair value	10,944	8,556
Fair value, Foreclosed real estate	132
Assets, Fair Value Disclosure	$ 21,069	$ 10,806

Fair Value of Assets and Liab_6

Fair Value of Assets and Liabilities - Summary of Carrying Values, Estimated Fair Values and Placement in Fair Value Hierarchy of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financial assets:
Securities available for sale	$ 55,551	$ 57,503
Level 2 [Member]
Financial assets:
Securities available for sale	55,551	57,503
Loans held for sale	87,805	62,792
Derivative assets	12,088	1,483
Certificates of deposit		492
Financial liabilities:
Deposits	522,970	496,979
FRB advances	15,318
FHLBB advances	68,204	44,433
Derivative liabilities	924	140
Level 3 [Member]
Financial assets:
Loans, net	483,956	469,416
Carrying Amount [Member]
Financial assets:
Securities available for sale	55,551	57,503
Loans held for sale	87,805	62,792
Loans, net	484,548	469,131
Derivative assets	12,088	1,483
Certificates of deposit		490
Financial liabilities:
Deposits	522,285	497,042
FRB advances	15,318
FHLBB advances	66,903	44,403
Derivative liabilities	924	140
Fair Value [Member]
Financial assets:
Securities available for sale	55,551	57,503
Loans held for sale	87,805	62,792
Loans, net	483,956	469,416
Derivative assets	12,088	1,483
Certificates of deposit		492
Financial liabilities:
Deposits	522,970	496,979
FRB advances	15,318
FHLBB advances	68,204	44,433
Derivative liabilities	$ 924	$ 140

Commitments and Contingencies -

Commitments and Contingencies - Summary of Financial Instruments Outstanding Contract Amounts Represent Credit Risk (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Commitments to Originate Loans [Member]
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk	$ 439,452	$ 117,086
Unused Lines and Letters of Credit [Member]
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk	66,997	52,721
Unadvanced Funds on Construction Loans [Member]
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk	7,192	11,029
Overdraft Lines of Credit [Member]
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk	$ 8,004	$ 8,178

Segment Information - Additiona

Segment Information - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)SegmentOffice	Sep. 30, 2019USD ($)
Segment Reporting Information [Line Items]
Number of business segments | Segment			2
Number of branch offices | Office			5
Servicing fees amount	$ (1,180,000)	$ 181,000	$ 1,428,000	$ (362,000)
Envision Mortgage [Member]
Segment Reporting Information [Line Items]
Premium percentage for new loans			1.50%	1.50%
Premium income	357,000	228,000	$ 1,052,000	$ 605,000
Percentage of fees for HELOC			1.00%	1.00%
Servicing fees amount	(1,278,000)	88,000	$ 1,147,000	$ (635,000)
Envision Bank [Member]
Segment Reporting Information [Line Items]
Percentage of loan servicing fees			0.14%	0.14%
Servicing fees amount	$ 98,000	$ 93,000	$ 281,000	$ 273,000

Segment Information - Summary o

Segment Information - Summary of Segment Information (Detail) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020		Sep. 30, 2019		Dec. 31, 2019
Segment Reporting Information [Line Items]
Net interest income	$ 4,669,000		$ 4,573,000		$ 13,827,000		$ 13,440,000
Provision (credit) for loan losses	546,000				2,338,000		(144,000)
Net interest income after provision (credit) for loan losses	4,123,000		4,573,000		11,489,000		13,584,000
Non-interest income:
Customer service fees	330,000		363,000		902,000		1,054,000
Gain on loan origination and sale activities, net	18,459,000	[1]	6,010,000	[2]	40,667,000	[1]	14,043,000	[2]
Mortgage servicing fees, net	1,180,000		(181,000)		(1,428,000)		362,000
Other	262,000		339,000		734,000		717,000
Total non-interest income	20,231,000		6,531,000		40,875,000		16,176,000
Non-interest expenses:
Salaries and employee benefits	7,911,000		7,010,000		24,439,000	[3]	18,514,000
Occupancy and equipment	859,000		673,000		2,395,000		1,972,000
Other non-interest expenses	2,281,000		2,035,000		6,555,000		5,973,000
Total non-interest expenses	11,051,000		9,718,000		33,389,000		26,459,000
Income (loss) before income taxes and elimination of inter-segment profit	13,303,000		1,386,000		18,975,000		3,301,000
Elimination of inter-segment profit	(357,000)		(228,000)		(1,051,000)		(605,000)
Income before income taxes	12,946,000		1,158,000		17,924,000		2,696,000
Income tax expense	2,661,000		14,000		3,266,000		97,000
Net income	10,285,000		1,144,000		14,658,000		2,599,000
Total assets	722,968,000		641,438,000		722,968,000		641,438,000		$ 631,004,000
Income before income taxes	12,946,000		1,158,000		17,924,000		2,696,000
Envision Bank [Member]
Segment Reporting Information [Line Items]
Net interest income	4,032,000		3,781,000		11,970,000		12,121,000
Provision (credit) for loan losses	546,000				2,338,000		(144,000)
Net interest income after provision (credit) for loan losses	3,486,000		3,781,000		9,632,000		12,265,000
Non-interest income:
Customer service fees	309,000		331,000		827,000		948,000
Mortgage servicing fees, net	(98,000)		(93,000)		(281,000)		(273,000)
Other	93,000		242,000		318,000		464,000
Total non-interest income	304,000		480,000		864,000		1,139,000
Non-interest expenses:
Salaries and employee benefits	1,959,000		1,966,000		6,983,000	[3]	5,292,000
Occupancy and equipment	437,000		367,000		1,305,000		1,137,000
Other non-interest expenses	1,084,000		1,184,000		3,286,000		3,434,000
Total non-interest expenses	3,480,000		3,517,000		11,574,000		9,863,000
Income (loss) before income taxes and elimination of inter-segment profit	310,000		744,000		(1,078,000)		3,541,000
Total assets	573,003,000		509,021,000		573,003,000		509,021,000
Envision Mortgage [Member]
Segment Reporting Information [Line Items]
Net interest income	637,000		792,000		1,857,000		1,319,000
Net interest income after provision (credit) for loan losses	637,000		792,000		1,857,000		1,319,000
Non-interest income:
Customer service fees	21,000		32,000		75,000		106,000
Gain on loan origination and sale activities, net	18,459,000	[1]	6,010,000	[2]	40,667,000	[1]	14,043,000	[2]
Mortgage servicing fees, net	1,278,000		(88,000)		(1,147,000)		635,000
Other	169,000		97,000		416,000		253,000
Total non-interest income	19,927,000		6,051,000		40,011,000		15,037,000
Non-interest expenses:
Salaries and employee benefits	5,952,000		5,044,000		17,456,000	[3]	13,222,000
Occupancy and equipment	422,000		306,000		1,090,000		835,000
Other non-interest expenses	1,197,000		851,000		3,269,000		2,539,000
Total non-interest expenses	7,571,000		6,201,000		21,815,000		16,596,000
Income (loss) before income taxes and elimination of inter-segment profit	12,993,000		642,000		20,053,000		(240,000)
Total assets	$ 149,965,000		$ 132,417,000		$ 149,965,000		$ 132,417,000
[1]	Before elimination of inter-segment profit.
[2]	Before elimination of inter-segment profit
[3]	Salaries and benefits for the nine months ended September 30, 2020, include the severance and vested stock acceleration costs related to the retirement of the Chief Executive Officer and Chief Financial Officer of the Bank. Total cost of this event was $1.38 million, of which $1.03 million was allocated to the Bank segment and the remainder, $344,000, was allocated to the mortgage segment

Segment Information - Summary_2

Segment Information - Summary of Segment Information (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2020USD ($)
Salaries and benefits cost including the severance and vested stock acceleration costs	$ 1,380,000
Bank Segment [Member]
Salaries and benefits cost including the severance and vested stock acceleration costs	1,030,000
Mortgage Segment [Member]
Salaries and benefits cost including the severance and vested stock acceleration costs	$ 344,000

Subsequent Event - Additional I

Subsequent Event - Additional Information (Details)	Oct. 27, 2020shares
Subsequent Events [Abstract]
Number of shares authorized to repurchase	552,000
Stock repurchase program percentage of outstanding shares repurchased	10.00%
Stock Repurchase Program Expiration Date	Oct. 29, 2021