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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying amount and estimated fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial assets:    
Securities held-to-maturity fair value $ 90,529 $ 121,506
Level 1 | Carrying Amount    
Financial assets:    
Cash and cash equivalents 283,971 186,879
Interest-bearing time deposits with banks 248 248
Level 1 | Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 283,971 186,879
Interest-bearing time deposits with banks 248 248
Level 2 | Carrying Amount    
Financial assets:    
Securities held-to-maturity fair value 88,477 121,715
Accrued interest receivable 13,951 15,300
Financial liabilities:    
Securities sold under agreements to repurchase 44,433 46,195
Accrued interest payable 1,132 1,207
Level 2 | Estimated Fair Value    
Financial assets:    
Securities held-to-maturity fair value 90,529 121,506
Accrued interest receivable 13,951 15,300
Financial liabilities:    
Securities sold under agreements to repurchase 44,433 46,195
Accrued interest payable 1,132 1,207
Level 3 | Carrying Amount    
Financial assets:    
Restricted stock 2,425 2,719
Loans, net 2,141,527 2,123,748
Investments in unconsolidated subsidiaries 1,165 1,165
Financial liabilities:    
Time deposits 356,408 424,747
Subordinated debentures 37,583 37,517
Level 3 | Estimated Fair Value    
Financial assets:    
Restricted stock 2,425 2,719
Loans, net 2,181,103 2,125,698
Investments in unconsolidated subsidiaries 1,165 1,165
Financial liabilities:    
Time deposits 355,340 419,333
Subordinated debentures $ 31,959 $ 32,149