REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	$ 22,638	$ 17,755	$ 64,975	$ 52,075
Loan servicing income	784	638	2,495	1,980
Securities gains, net	1,535	1,300	4,347	4,964
Unrealized gain on equity securities, net	112	155	85	604
Net gains on sale of loans held for sale	5,281	8,894	16,454	21,411
Valuation adjustment on servicing rights	195	(120)	586	(1,676)
Income on bank owned life insurance	940	868	2,706	2,533
Other noninterest income	1,239	1,726	4,557	5,779
Total noninterest income out-of-scope of Topic 606	10,086	13,461	31,230	35,595
TOTAL NONINTEREST INCOME	32,724	31,216	96,205	87,670
Total service charges and fees
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	15,551	11,749	44,354	34,742
Service charges and fees on deposit accounts
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	4,146	3,710	12,096	10,623
Overdraft fees
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	3,044	2,184	8,185	6,627
Customer service and other service fees
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	52	39	152	133
Credit card fee income
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	5,673	3,894	15,835	11,861
Debit card income
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	2,636	1,922	8,086	5,498
Trust fees
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	6,221	5,357	18,037	15,356
Brokerage and insurance commissions
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	$ 866	$ 649	$ 2,584	$ 1,977