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, 2020	Dec. 31, 2019
Commitments Off-Balance Sheet Risks and Contingencies [Line Items]
Fixed Rate	$ 65,319	$ 44,210
Variable Rate	1,994,755	1,790,941
Commercial loan
Commitments Off-Balance Sheet Risks and Contingencies [Line Items]
Fixed Rate	52,568	39,104
Variable Rate	1,646,539	1,451,704
Standby letters of credit
Commitments Off-Balance Sheet Risks and Contingencies [Line Items]
Fixed Rate	0	0
Variable Rate	53,796	70,932
Real estate mortgage loans
Commitments Off-Balance Sheet Risks and Contingencies [Line Items]
Fixed Rate	11,984	4,448
Variable Rate	3,921	1,488
Real estate construction mortgage loans
Commitments Off-Balance Sheet Risks and Contingencies [Line Items]
Fixed Rate	767	478
Variable Rate	3,051	2,139
Home equity mortgage open-ended revolving lines
Commitments Off-Balance Sheet Risks and Contingencies [Line Items]
Fixed Rate	0	0
Variable Rate	267,530	247,562
Consumer loan open-ended revolving lines
Commitments Off-Balance Sheet Risks and Contingencies [Line Items]
Fixed Rate	0	180
Variable Rate	$ 19,918	$ 17,116