SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Selected Quarterly Financial Information [Abstract]
Interest and dividend income	$ 36,353	$ 35,808	$ 35,887	$ 35,847	$ 37,720	$ 37,048	$ 36,621	$ 37,169	$ 143,895	$ 148,558	$ 154,784
Interest expense	2,368	3,005	3,357	3,795	4,970	5,879	7,174	10,469	12,525	28,492	45,722
Net interest and dividend income	33,985	32,803	32,530	32,052	32,750	31,169	29,447	26,700	131,370	120,066	109,062
Provision (credit) for loan losses	(1,436)	(1,627)	(4,286)	91	7,608	13,454	10,004	3,749	(7,258)	34,815	4,747
Other noninterest income	19,164	21,769	21,703	37,809	37,027	44,439	38,569	16,113
Gain on sale and call of securities, net		241					8	2,525	241	2,533	1,344
Total noninterest income	19,164	22,010	21,703	37,809	37,027	44,439	38,577	18,638	100,686	138,680	60,095
Total noninterest expenses	38,188	39,274	38,598	42,802	41,286	45,700	43,777	35,160	158,862	165,922	141,734
Income tax benefit	3,807	4,907	5,645	7,576	3,283	4,561	3,668	1,705	21,935	13,217	4,408
Net income	$ 12,590	$ 12,259	$ 14,276	$ 19,392	$ 17,600	$ 11,893	$ 10,575	$ 4,724	$ 58,517	$ 44,792	$ 18,268
Basic earnings per share	$ 0.26	$ 0.25	$ 0.28	$ 0.37	$ 0.33	$ 0.22	$ 0.19	$ 0.09	$ 1.15	$ 0.82	$ 0.33
Diluted earnings per share	$ 0.25	$ 0.24	$ 0.27	$ 0.37	$ 0.33	$ 0.22	$ 0.19	$ 0.09	$ 1.14	$ 0.82	$ 0.33
Weighted average common shares, basic	48,918,539	49,801,123	51,778,293	52,537,409	53,947,868	54,465,339	54,450,146	54,392,465	50,746,302	54,313,368	55,731,637
Weighted average common shares, diluted	49,828,379	50,663,415	52,650,071	53,000,830	53,973,737	54,465,339	54,450,146	54,392,465	51,523,135	54,319,835	55,731,776