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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying amount and estimated fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financial assets:    
Debt securities held-to-maturity $ 72,441 $ 90,529
Level 1 | Carrying Amount    
Financial assets:    
Cash and cash equivalents 312,451 283,971
Interest-bearing time deposits with banks   248
Level 1 | Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 312,451 283,971
Interest-bearing time deposits with banks   248
Level 2 | Carrying Amount    
Financial assets:    
Debt securities held-to-maturity 68,395 88,477
Accrued interest receivable 14,255 13,951
Financial liabilities:    
Securities sold under agreements to repurchase 45,736 44,433
Accrued interest payable 1,151 1,132
Level 2 | Estimated Fair Value    
Financial assets:    
Debt securities held-to-maturity 72,441 90,529
Accrued interest receivable 14,255 13,951
Financial liabilities:    
Securities sold under agreements to repurchase 45,736 44,433
Accrued interest payable 1,151 1,132
Level 3 | Carrying Amount    
Financial assets:    
Restricted stock 2,498 2,425
Loans, net 2,215,168 2,141,527
Investments in unconsolidated subsidiaries 1,165 1,165
Financial liabilities:    
Time deposits 299,474 356,408
Level 3 | Estimated Fair Value    
Financial assets:    
Restricted stock 2,498 2,425
Loans, net 2,235,767 2,181,103
Investments in unconsolidated subsidiaries 1,165 1,165
Financial liabilities:    
Time deposits 300,989 355,340
Subordinated Notes | Level 3 | Carrying Amount    
Financial liabilities:    
Subordinated debt 39,238  
Subordinated Notes | Level 3 | Estimated Fair Value    
Financial liabilities:    
Subordinated debt 38,403  
Junior Subordinated Debentures Issued | Level 3 | Carrying Amount    
Financial liabilities:    
Subordinated debt 37,648 37,583
Junior Subordinated Debentures Issued | Level 3 | Estimated Fair Value    
Financial liabilities:    
Subordinated debt $ 23,766 $ 31,959