CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest and dividend income
Interest on taxable loans	$ 84,382	$ 57,941	$ 51,238
Interest on tax-exempt loans	584	371	496
Interest on taxable investment securities	7,963	7,457	6,321
Interest on tax-exempt investment securities	2,289	2,404	2,600
Dividends on FHLB of Boston stock	390	287	245
Interest on overnight investments	731	595	291
Total interest and dividend income	96,339	69,055	61,191
Interest expense
Interest on deposits	15,641	5,023	3,125
Interest on borrowed funds	2,002	444	462
Total interest expense	17,643	5,467	3,587
Net interest and dividend income	78,696	63,588	57,604
Provision for Loan Losses	3,004	1,502	362
Net interest and dividend income after provision for loan losses	75,692	62,086	57,242
Noninterest income
Bank owned life insurance income	612	526	584
Gain (loss) on disposition of investment securities	(79)	2	(3)
Gain on loans sold	1,170	99	355
Loan related derivative income	1,674	1,651	780
Other income	1,927	1,269	1,155
Total noninterest income	36,401	32,989	30,224
Noninterest expense
Salaries and employee benefits	47,494	41,212	36,455
Occupancy and equipment	10,855	9,072	9,114
Data processing	6,232	5,177	4,956
Professional services	3,623	3,258	3,374
Marketing	1,760	2,229	1,620
FDIC insurance	291	574	629
Nonoperating expenses	4,721	201
Other expenses	3,199	2,264	3,144
Total noninterest expense	78,175	63,987	59,292
Income before income taxes	33,918	31,088	28,174
Income tax expense	8,661	7,207	13,358
Net income	$ 25,257	$ 23,881	$ 14,816
Share data:
Weighted average number of shares outstanding, basic	4,629,255	4,061,529	4,030,530
Weighted average number of shares outstanding, diluted	4,661,720	4,098,633	4,065,754
Basic earnings per share	$ 5.41	$ 5.82	$ 3.64
Diluted earnings per share	$ 5.37	$ 5.77	$ 3.61
Wealth Management Revenue
Noninterest income
Noninterest income	$ 26,499	$ 25,191	$ 23,029
Deposit Account Fees
Noninterest income
Noninterest income	3,185	3,071	3,142
ATM/Debit Card Income
Noninterest income
Noninterest income	$ 1,413	$ 1,180	$ 1,182