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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying amount and estimated fair value (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Financial assets:    
Debt securities held-to-maturity $ 78,317 $ 90,529
Level 1 | Carrying Amount    
Financial assets:    
Cash and cash equivalents 314,365 283,971
Interest-bearing time deposits with banks   248
Level 1 | Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 314,365 283,971
Interest-bearing time deposits with banks   248
Level 2 | Carrying Amount    
Financial assets:    
Debt securities held-to-maturity 73,823 88,477
Accrued interest receivable 12,661 13,951
Financial liabilities:    
Securities sold under agreements to repurchase 51,354 44,433
Accrued interest payable 821 1,132
Level 2 | Estimated Fair Value    
Financial assets:    
Debt securities held-to-maturity 78,317 90,529
Accrued interest receivable 12,661 13,951
Financial liabilities:    
Securities sold under agreements to repurchase 51,354 44,433
Accrued interest payable 821 1,132
Level 3 | Carrying Amount    
Financial assets:    
Restricted stock 2,498 2,425
Loans, net 2,246,072 2,141,527
Investments in unconsolidated subsidiaries 1,165 1,165
Financial liabilities:    
Time deposits 310,818 356,408
Subordinated debentures 37,616 37,583
Level 3 | Estimated Fair Value    
Financial assets:    
Restricted stock 2,498 2,425
Loans, net 2,259,411 2,181,103
Investments in unconsolidated subsidiaries 1,165 1,165
Financial liabilities:    
Time deposits 312,873 355,340
Subordinated debentures $ 31,507 $ 31,959