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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
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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

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