CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 25,257	$ 23,881	$ 14,816
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	3,004	1,502	362
Amortization of deferred charges and fees, net	166	777	972
Net (Accretion)/Amortization of merger-related intangibles	(1,176)
Depreciation and amortization	2,004	1,888	1,948
Bank owned life insurance income	(612)	(526)	(584)
Loss/(gain) on disposition of investment securities	79	(2)	3
Share based compensation	2,170	2,633	2,052
Change in accrued interest receivable	(162)	(634)	(501)
Deferred income tax expense/(benefit)	110	(721)	2,687
Change in other assets, net	(11,667)	(12,231)	(758)
Change in other liabilities, net	11,166	7,455	2,264
Change in loans held for sale	(1,546)		6,506
Net cash provided by operating activities	28,793	24,022	29,767
CASH FLOWS FROM INVESTING ACTIVITIES
Origination of loans	(790,097)	(596,259)	(354,657)
Proceeds from principal payments of loans	524,907	387,537	323,632
Proceeds from principal loan pool sales	74,412
Purchase of securities available for sale	(23,450)		(5,091)
Proceeds from calls/maturities of securities available for sale	49,832	35,415	47,955
Proceeds from sales of securities available for sale and held to maturity	26,552	702	77,369
Proceeds from calls/maturities of securities held to maturity	72,655	33,064	34,488
Purchase of securities held to maturity	(48,906)	(84,261)	(184,505)
Proceeds from settlement of bank owned life insurance policies		676
Redemption/(purchase) of FHLB of Boston stock	456	(2,602)	(144)
Purchase of banking premises and equipment	(1,896)	(1,155)	(807)
Net cash acquired in business combinations	2,063
Net cash (used in) provided by investing activities	(113,472)	(226,883)	(61,760)
CASH FLOWS FROM FINANCING ACTIVITIES
Change in demand, interest bearing, money market and savings accounts	171,961	74,421	100,694
Change in certificates of deposit	(101,928)	(38,467)	(11,411)
Change in borrowings	28,823	89,830	(167)
Proceeds from common stock offering (net of underwriting fees)	38,202
Cash dividends paid on common stock	(9,517)	(8,041)	(7,582)
Net cash provided by (used in) financing activities	127,541	117,743	81,534
Net (decrease)/increase in cash and cash equivalents	42,862	(85,118)	49,541
Cash and cash equivalents at beginning of period	18,473	103,591	54,050
Cash and cash equivalents at end of period	61,335	18,473	103,591
Cash paid during the period for:
Interest	17,918	5,457	3,579
Income taxes	7,770	$ 8,330	$ 10,100
Significant non-cash transactions
Right-of-use assets for lessee operating leases	33,587
Right-of-use liabilities for lessee operating leases	35,054
Transfer of other real estate owned	163
Common Stock issued to Optima shareholders	59,417
Fair value of assets acquired, net of cash acquired	548,801
Fair value of liabilities assumed	$ 491,447