REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ 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
Revenue from External Customer [Line Items]
In-scope other operating income									$ 28,707	$ 23,812	$ 26,039
Out-of-scope other operating income									14,353	21,386	15,762
Total other operating income	$ 11,566	$ 10,253	$ 10,530	$ 10,711	$ 14,057	$ 11,563	$ 10,692	$ 8,886	43,060	45,198	41,801
Mortgage banking income
Revenue from External Customer [Line Items]
In-scope other operating income									1,993	1,128	702
Service charges on deposit accounts
Revenue from External Customer [Line Items]
In-scope other operating income									6,358	6,234	8,406
Other service charges and fees
Revenue from External Customer [Line Items]
In-scope other operating income									15,281	11,621	12,536
Income from fiduciary activities
Revenue from External Customer [Line Items]
In-scope other operating income									$ 5,075	$ 4,829	$ 4,395