LOANS - Schedule of Industry and Rate Sensitivity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	$ 1,967,667	$ 1,968,991
Computer Programming, Data Processing & Other Computer Related Services
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	464,921	437,257
Management & Public Relations Services
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	229,097	263,187
Industrial Inorganic Chemicals
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	155,728	156,292
Miscellaneous Industrial & Commercial
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	96,789	93,619
Miscellaneous Health & Allied Services, not elsewhere classified
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	96,104	64,133
Public Warehousing & Storage
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	95,037	94,179
Electronic Components & Accessories
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	92,166	92,261
Surgical, Medical & Dental Instruments & Supplies
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	80,391	80,786
Drugs
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	67,244	0
Research, Development & Testing Services
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	62,689	59,311
Engineering, Architectural & Surveying
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	50,023	49,088
Offices & Clinics of Doctors of Medicine
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	49,910	50,017
Medical & Dental Laboratories
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	48,603	30,199
Insurance Agents, Brokers & Service
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	43,360	43,598
Telephone Communications
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	42,651	42,589
Electrical Work
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	42,611	42,617
Miscellaneous Equipment Rental & Leasing
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	32,367	32,346
Home Health Care Services
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	28,600	28,660
Metal Forgings & Stampings
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	27,514	27,483
Legal Services
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	26,146	26,105
Petroleum & Petroleum Products
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	20,705	21,434
Sanitary Services
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	20,410	20,453
Grocery Stores
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	19,646	19,745
Coating, Engraving & Allied Services
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	17,742	17,705
Chemicals & Allied Products
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	14,626	14,657
Mailing, Reproduction, Commercial Art & Photography & Stenographic
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	12,431	12,388
Machinery, Equipment & Supplies
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	10,323	10,814
Offices & Clinics of Other Health Practitioners
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	10,068	10,083
Schools & Educational Services, not elsewhere classified
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	9,765	9,781
Metal Cans & Shipping Containers
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	$ 0	$ 118,204