INCOME TAXES (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Tax effect of net unrealized loss on derivatives reflected in stockholders’ equity	$ 1,130	$ 563
Allowance for credit losses	33,393	17,686
Deferred compensation	9,623	8,071
Net operating loss carryforwards	17,585	18,459
Tax credit projects	4,746	4,252
Deferred loan fees	3,496	0
Other	5,563	4,754
Total deferred tax assets	75,536	53,785
Valuation allowance for deferred tax assets	(12,828)	(12,379)
Total deferred tax assets after valuation allowance	62,708	41,406
Deferred tax liabilities:
Tax effect of net unrealized gain on securities carried at fair value reflected in stockholders’ equity	26,858	279
Securities	4,914	4,240
Premises, furniture and equipment	8,311	6,232
Purchase accounting	5,326	7,824
Prepaid expenses	2,675	2,176
Deferred loan costs	2,597	3,342
Other	3,905	3,713
Total deferred tax liabilities	54,586	27,806
Net deferred tax asset	$ 8,122	$ 13,600