Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest and dividend income:
Interest and fees on loans	$ 142,228	$ 105,432	$ 81,114
Interest on loans held for sale	2,767	2,205	2,739
Interest on taxable securities	6,325	5,624	4,404
Interest on non-taxable securities	494	856	867
Other interest and dividend income	2,970	1,591	1,160
Total interest and dividend income	154,784	115,708	90,284
Interest expense:
Interest on deposits	37,057	20,563	10,962
Interest on FHLB borrowings	6,588	5,474	4,974
Interest on subordinated debentures	2,077	741
Total interest expense	45,722	26,778	15,936
Net interest and dividend income	109,062	88,930	74,348
Provision for loan losses	4,747	3,828	2,416
Net interest and dividend income, after provision for loan losses	104,315	85,102	71,932
Mortgage banking income:
Changes in mortgage servicing rights fair value	(6,241)	(1,396)	(2,056)
Other	43,893	32,005	39,251
Total mortgage banking income	37,652	30,609	37,195
Deposit account fees	16,294	13,500	12,311
Income on retirement plan annuities	402	433	455
Loss on disposal of asset held for sale	(482)
Gain on sale of consumer loans			78
Gain on sale and call of securities, net	1,344	5
Bank-owned life insurance income	1,105	1,728	1,024
Other income	4,657	2,923	3,471
Total noninterest income	60,972	49,198	54,534
Noninterest expense:
Compensation and benefits	86,787	70,568	66,223
Occupancy and equipment	17,396	13,212	11,715
Data processing	8,692	6,789	6,157
Loan expenses	6,202	5,382	6,881
Marketing	3,705	3,333	3,595
Deposit expenses	1,583	1,320	1,349
Postage and printing	1,935	1,494	1,388
Professional fees	5,689	3,832	4,233
Foreclosed and repossessed assets	13	95	62
Deposit insurance	1,035	2,097	1,717
Merger expenses		5,092
Other expenses	9,574	6,879	6,094
Total noninterest expense	142,611	120,093	109,414
Income before income taxes	22,676	14,207	17,052
Income tax provision	4,408	2,813	6,673
Net income	$ 18,268	$ 11,394	$ 10,379
Earnings per common share (1):
Basic	$ 0.33	$ 0.20	$ 0.19
Diluted	$ 0.33	$ 0.20	$ 0.19
Weighted average shares outstanding (1):
Basic	55,731,637	56,689,591	56,068,289
Diluted	55,731,776	56,689,591	56,068,289