Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ 4,112,000	$ (818,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Provision (credit) for loan losses	(213,000)	724,000
Loans originated for sale	(487,808,000)	(219,471,000)
Net gain on sales of mortgage loans	(10,993,000)	(5,825,000)
Proceeds from sales of mortgage loans	515,419,000	229,579,000
Net amortization of securities	95,000	54,000
Net change in deferred loan costs and fees, and purchase premiums	339,000	3,000
Depreciation and amortization	182,000	218,000
Stock-based compensation	283,000	931,000
ESOP expense	94,000	68,000
Increase in cash surrender value of life insurance	(40,000)	(45,000)
Net (increase) decrease in mortgage servicing rights	(2,366,000)	1,068,000
Other, net	9,293,000	(2,908,000)
Net cash provided by operating activities	28,397,000	3,578,000
Securities available for sale:
Purchases	(3,913,000)
Calls/maturities		1,000,000
Principal payments on mortgage-backed securities	4,119,000	2,548,000
Loan originations, net of principal repayments	(2,900,000)	(6,435,000)
Loan purchases		(1,519,000)
Purchases of Federal Home Loan Bank of Boston stock		(456,000)
Purchases of premises and equipment	(110,000)	(137,000)
Net cash used in investing activities	(2,804,000)	(4,999,000)
Cash flows from financing activities:
Net increase in non-brokered deposits	31,455,000	12,884,000
Net increase (decrease) in brokered deposits	496,000	(4,907,000)
Net decrease in Federal Reserve Bank borrowings	(11,431,000)
Net decrease in short-term Federal Home Loan Bank of Boston borrowings		(19,822,000)
Issuance of long-term Federal Home Loan Bank of Boston advances		27,432,000
Repayments of long-term Federal Home Loan Bank of Boston advances	(1,871,000)
Net increase (decrease) in mortgagors' escrow accounts	(414,000)	22,000
Repurchases of common stock	(2,652,000)	(1,195,000)
Net cash provided by financing activities	15,583,000	14,414,000
Net change in cash and cash equivalents	41,176,000	12,993,000
Cash and cash equivalents at beginning of period	13,774,000	8,252,000
Cash and cash equivalents at end of period	54,950,000	21,245,000
Supplemental cash flow information:
Interest paid on deposits and borrowed funds	794,000	1,728,000
Income taxes paid	655,000	225,000
Non-cash item:
Transfer of held for sale loans to portfolio	5,565,000
Transfer of portfolio loan to foreclosed real estate		$ 132,000
Initial recognition of operating lease at commencement	$ 1,310,000