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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Available for Sale, Amortized Cost    
Due in one year or less $ 32,455  
Due after one year through five years 60,696  
Due after five years through ten years 63,661  
Due after ten years 39,008  
Total 1,176,462  
Available for Sale, Estimated Fair Value    
Due in one year or less 32,658  
Due after one year through five years 61,195  
Due after five years through ten years 64,715  
Due after ten years 39,753  
Available-for-sale debt securities, at fair value 1,186,875 $ 1,205,478
Equity securities, at fair value 1,058 826
Residential - U.S. Government-sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 721,081  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 723,644  
Available-for-sale debt securities, at fair value 723,644 717,052
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale, Amortized Cost    
Mortgage-backed securities 86,697  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 87,742  
Available-for-sale debt securities, at fair value 87,742 51,483
Residential - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 38,140  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 39,109  
Available-for-sale debt securities, at fair value 39,109 41,118
Commercial - Non-government agencies    
Available for Sale, Amortized Cost    
Mortgage-backed securities 134,724  
Available for Sale, Estimated Fair Value    
Mortgage-backed securities 138,059  
Available-for-sale debt securities, at fair value 138,059 134,728
Equity securities    
Available for Sale, Estimated Fair Value    
Equity securities, at amortized cost 898 826
Equity securities, at fair value $ 1,058 $ 826