LOANS - Schedule of Industry and Rate Sensitivity (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	$ 1,887,182	$ 1,011,275
Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	1,887,182	1,011,275
Aircraft and parts
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	41,342	34,814
Aircraft and parts | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Aircraft and parts | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	41,342	34,814
Arrangement of transportation of freight & cargo
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	21,632	0
Arrangement of transportation of freight & cargo | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Arrangement of transportation of freight & cargo | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	21,632	0
Coating, engraving and allied services
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	57,223	64,034
Coating, engraving and allied services | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Coating, engraving and allied services | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	57,223	64,034
Computer programming, data processing & other computer related services
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	242,185	209,624
Computer programming, data processing & other computer related services | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Computer programming, data processing & other computer related services | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	242,185	209,624
Drugs
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	35,882	38,708
Drugs | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Drugs | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	35,882	38,708
Electrical work
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	41,760	0
Electrical work | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Electrical work | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	41,760	0
Electronic components & accessories
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	24,059	23,916
Electronic components & accessories | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Electronic components & accessories | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	24,059	23,916
Engineering, architectural & surveying
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	80,748	0
Engineering, architectural & surveying | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Engineering, architectural & surveying | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	80,748	0
Groceries and related products
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	14,794
Groceries and related products | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Groceries and related products | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	14,794
Grocery stores
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	23,431	23,531
Grocery stores | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Grocery stores | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	23,431	23,531
Home health care services
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	23,779
Home health care services | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Home health care services | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	23,779
Insurance agents, brokers and services
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	48,942	28,872
Insurance agents, brokers and services | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Insurance agents, brokers and services | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	48,942	28,872
Mailing, reproduction, commercial art and photography, and stenographic
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	14,843	0
Mailing, reproduction, commercial art and photography, and stenographic | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Mailing, reproduction, commercial art and photography, and stenographic | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	14,843	0
Management and public relations services
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	487,046	94,871
Management and public relations services | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Management and public relations services | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	487,046	94,871
Medical and dental laboratories
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	26,858	26,956
Medical and dental laboratories | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Medical and dental laboratories | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	26,858	26,956
Metal cans & shipping containers
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	118,248	0
Metal cans & shipping containers | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Metal cans & shipping containers | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	118,248	0
Miscellaneous business services
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	19,622	19,723
Miscellaneous business services | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Miscellaneous business services | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	19,622	19,723
Miscellaneous equipment rental and leasing
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	49,552	49,129
Miscellaneous equipment rental and leasing | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Miscellaneous equipment rental and leasing | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	49,552	49,129
Miscellaneous health and allied services, not elsewhere classified
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	56,003	25,963
Miscellaneous health and allied services, not elsewhere classified | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Miscellaneous health and allied services, not elsewhere classified | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	56,003	25,963
Miscellaneous nonmetallic minerals, except fuels
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	25,992
Miscellaneous nonmetallic minerals, except fuels | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Miscellaneous nonmetallic minerals, except fuels | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	25,992
Miscellaneous plastic products
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	9,953	9,879
Miscellaneous plastic products | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Miscellaneous plastic products | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	9,953	9,879
Motor vehicles and motor vehicle equipment
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	16,563	0
Motor vehicles and motor vehicle equipment | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Motor vehicles and motor vehicle equipment | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	16,563	0
Motor vehicles and motor vehicle parts and supplies
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	29,046	12,212
Motor vehicles and motor vehicle parts and supplies | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Motor vehicles and motor vehicle parts and supplies | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	29,046	12,212
Nonferrous foundries (castings)
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	12,948	0
Nonferrous foundries (castings) | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Nonferrous foundries (castings) | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	12,948	0
Offices and clinics of doctors of medicine
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	97,877	60,000
Offices and clinics of doctors of medicine | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Offices and clinics of doctors of medicine | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	97,877	60,000
Offices of clinics and other health practitioners
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	21,100	18,979
Offices of clinics and other health practitioners | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Offices of clinics and other health practitioners | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	21,100	18,979
Public warehousing and storage
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	84,278	48,890
Public warehousing and storage | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Public warehousing and storage | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	84,278	48,890
Research, development and testing services
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	33,381	33,155
Research, development and testing services | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Research, development and testing services | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	33,381	33,155
Schools and educational services, not elsewhere classified
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	19,805	20,625
Schools and educational services, not elsewhere classified | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Schools and educational services, not elsewhere classified | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	19,805	20,625
Services allied with the exchange of securities
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	14,877	13,960
Services allied with the exchange of securities | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Services allied with the exchange of securities | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	14,877	13,960
Surgical, medical, and dental instruments and supplies
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	96,607	29,687
Surgical, medical, and dental instruments and supplies | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Surgical, medical, and dental instruments and supplies | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	96,607	29,687
Telephone communications
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	61,371	59,182
Telephone communications | Fixed Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	0	0
Telephone communications | Floating Rate
Schedule of Held-to-maturity Securities [Line Items]
Corporate debt	$ 61,371	$ 59,182