SELECTED QUARTERLY DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Data [Abstract]
Net interest income	$ 59,407	$ 57,824	$ 58,938	$ 57,257	$ 56,125	$ 56,153	$ 57,460	$ 58,338	$ 233,426	$ 228,076	$ 234,566
Fees and other income	26,656	23,045	22,662	21,521	26,793	25,126	24,380	25,248	93,884	101,547	149,997
Total revenue	86,063	80,869	81,600	78,778	82,918	81,279	81,840	83,586	327,310	329,623	384,563
Provision/(credit) for loan losses	(2,999)	(4,569)	22,604	16,962	(3,668)	167	1,363	(1,426)	31,998	(3,564)	(2,198)
Total operating expense	57,967	60,937	61,453	60,908	58,457	55,537	55,659	60,553	241,265	230,206	267,355
Income/(loss) before income taxes	31,095	24,501	(2,457)	908	28,129	25,575	24,818	24,459	54,047	102,981	119,406
Income tax expense/(benefit)	6,124	1,821	841	102	6,788	5,517	5,369	4,917	8,888	22,591	37,537
Less: Net income attributable to noncontrolling interests	0	0	0	6	97	96	69	100	6	362	3,487
Net income/(loss) attributable to the Company	$ 24,971	$ 22,680	$ (3,298)	$ 800	$ 21,244	$ 19,962	$ 19,380	$ 19,442	$ 45,153	$ 80,028	$ 80,384
Basic earnings/(loss) per share (in dollars per share)	$ 0.30	$ 0.28	$ (0.04)	$ 0.01	$ 0.26	$ 0.24	$ 0.22	$ 0.25	$ 0.55	$ 0.97	$ 0.94
Diluted earnings/(loss) per share (in dollars per share)	$ 0.30	$ 0.28	$ (0.04)	$ 0.01	$ 0.26	$ 0.24	$ 0.22	$ 0.25	$ 0.55	$ 0.97	$ 0.92