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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, 2019
Dec. 31, 2018
Amortized Cost    
Due in one year or less $ 29,116  
Due from one year to five years 62,121  
Due from five to ten years 91,717  
Due after ten years 67,668  
Mortgage-backed securities 1,129,816  
Amortized Cost 1,380,438 $ 1,198,976
Estimated Fair Value    
Due in one year or less 29,298  
Due from one year to five years 63,030  
Due from five to ten years 93,822  
Due after ten years 68,383  
Mortgage-backed securities 1,148,870  
Estimated Fair Value $ 1,403,403 $ 1,192,423