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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying amount and estimated fair value (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financial assets:    
Debt securities held-to-maturity $ 321,156 $ 72,441
Level 1 | Carrying Amount    
Financial assets:    
Cash and cash equivalents 471,929 312,451
Level 1 | Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 471,929 312,451
Level 2 | Carrying Amount    
Financial assets:    
Debt securities held-to-maturity 318,730 68,395
Accrued interest receivable 13,376 14,255
Financial liabilities:    
Securities sold under agreements to repurchase 47,957 45,736
Accrued interest payable 483 1,151
Level 2 | Estimated Fair Value    
Financial assets:    
Debt securities held-to-maturity 321,156 72,441
Accrued interest receivable 13,376 14,255
Financial liabilities:    
Securities sold under agreements to repurchase 47,957 45,736
Accrued interest payable 483 1,151
Level 3 | Carrying Amount    
Financial assets:    
Restricted stock 2,739 2,498
Loans, net 2,122,951 2,215,168
Investments in unconsolidated subsidiaries 1,165 1,165
Financial liabilities:    
Time deposits 271,762 299,474
Level 3 | Estimated Fair Value    
Financial assets:    
Restricted stock 2,739 2,498
Loans, net 2,141,308 2,235,767
Investments in unconsolidated subsidiaries 1,165 1,165
Financial liabilities:    
Time deposits 272,105 300,989
Subordinated Notes | Level 3 | Carrying Amount    
Financial liabilities:    
Subordinated debt 39,297 39,238
Subordinated Notes | Level 3 | Estimated Fair Value    
Financial liabilities:    
Subordinated debt 42,371 38,403
Junior Subordinated Debentures Issued | Level 3 | Carrying Amount    
Financial liabilities:    
Subordinated debt 37,698 37,648
Junior Subordinated Debentures Issued | Level 3 | Estimated Fair Value    
Financial liabilities:    
Subordinated debt $ 32,270 $ 23,766