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INVESTMENT SECURITIES - Amortized Cost and Estimated Fair Value of Debt Securities, Available for Sale, by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Amortized Cost    
Due from one year to five years $ 29,918  
Due from one year to five years 49,109  
Due from five to ten years 66,769  
Due after ten years 46,263  
Mortgage-backed securities 748,521  
Debt securities, available-for-sale, amortized cost, total 940,580 $ 1,380,438
Estimated Fair Value    
Due in one year or less 30,228  
Due from one year to five years 51,276  
Due from five to ten years 68,972  
Due after ten years 48,199  
Mortgage-backed securities 784,204  
Debt securities, available-for-sale, estimated fair value, total $ 982,879 $ 1,403,403