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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying amount and estimated fair value (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financial assets:    
Debt securities held-to-maturity $ 83,564 $ 90,529
Level 1 | Carrying Amount    
Financial assets:    
Cash and cash equivalents 265,436 283,971
Interest-bearing time deposits with banks   248
Level 1 | Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 265,436 283,971
Interest-bearing time deposits with banks   248
Level 2 | Carrying Amount    
Financial assets:    
Debt securities held-to-maturity 79,741 88,477
Accrued interest receivable 12,096 13,951
Financial liabilities:    
Securities sold under agreements to repurchase 40,811 44,433
Accrued interest payable 1,024 1,132
Level 2 | Estimated Fair Value    
Financial assets:    
Debt securities held-to-maturity 83,564 90,529
Accrued interest receivable 12,096 13,951
Financial liabilities:    
Securities sold under agreements to repurchase 40,811 44,433
Accrued interest payable 1,024 1,132
Level 3 | Carrying Amount    
Financial assets:    
Restricted stock 2,425 2,425
Loans, net 2,106,865 2,141,527
Investments in unconsolidated subsidiaries 1,165 1,165
Financial liabilities:    
Time deposits 327,219 356,408
Subordinated debentures 37,599 37,583
Level 3 | Estimated Fair Value    
Financial assets:    
Restricted stock 2,425 2,425
Loans, net 2,134,424 2,181,103
Investments in unconsolidated subsidiaries 1,165 1,165
Financial liabilities:    
Time deposits 328,587 355,340
Subordinated debentures $ 31,431 $ 31,959