COMMITMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES - Commitments To Make Loans And Open Ended Revolving Lines Of Credit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Commitments Off-Balance Sheet Risks and Contingencies
Fixed Rate	$ 44,210	$ 67,051
Variable Rate	1,790,941	1,674,094
Working capital lines of credit loans
Commitments Off-Balance Sheet Risks and Contingencies
Fixed Rate	39,104	63,625
Variable Rate	1,451,704	1,337,437
Commercial Letters Of Credit [Member]
Commitments Off-Balance Sheet Risks and Contingencies
Fixed Rate	0	0
Variable Rate	0	3,245
Standby Letters of Credit [Member]
Commitments Off-Balance Sheet Risks and Contingencies
Fixed Rate	0	0
Variable Rate	70,932	81,512
Real Estate Mortgage Loans [Member]
Commitments Off-Balance Sheet Risks and Contingencies
Fixed Rate	4,448	2,811
Variable Rate	1,488	2,881
Real Estate Construction Mortgage Loans [Member]
Commitments Off-Balance Sheet Risks and Contingencies
Fixed Rate	478	400
Variable Rate	2,139	2,189
Residential construction loans
Commitments Off-Balance Sheet Risks and Contingencies
Fixed Rate	0	0
Variable Rate	247,562	232,362
Consumer loan open-ended revolving line
Commitments Off-Balance Sheet Risks and Contingencies
Fixed Rate	180	215
Variable Rate	$ 17,116	$ 14,468