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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Available for Sale    
Amortized cost $ 1,136,535 $ 1,116,545
Gross unrealized gains 31,423 13,737
Gross unrealized losses (1,639) (3,299)
Fair value 1,166,319 1,126,983
Available-for-sale, allowance for credit loss 0  
Mortgage Backed Securities Residential U S Government Sponsored Entities [Member]    
Available for Sale    
Amortized cost 743,786 673,918
Gross unrealized gains 20,395 6,003
Gross unrealized losses (855) (2,099)
Fair value 763,326 677,822
Available-for-sale, allowance for credit loss 0  
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale    
Amortized cost 71,335 80,773
Gross unrealized gains 2,451 1,198
Gross unrealized losses 0 (746)
Fair value 73,786 81,225
Available-for-sale, allowance for credit loss 0  
States and political subdivisions    
Available for Sale    
Amortized cost 163,642 119,755
Gross unrealized gains 5,239 2,303
Gross unrealized losses (292) (40)
Fair value 168,589 122,018
Available-for-sale, allowance for credit loss 0  
Corporate securities    
Available for Sale    
Amortized cost 50,318 30,277
Gross unrealized gains 471 252
Gross unrealized losses (231) 0
Fair value 50,558 30,529
Available-for-sale, allowance for credit loss 0  
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Available for Sale    
Amortized cost 35,115 40,769
Gross unrealized gains 41 10
Gross unrealized losses (212) (398)
Fair value 34,944 40,381
Available-for-sale, allowance for credit loss 0  
Residential - Non-government agencies    
Available for Sale    
Amortized cost 27,525 36,377
Gross unrealized gains 1,185 830
Gross unrealized losses (34) (16)
Fair value 28,676 37,191
Available-for-sale, allowance for credit loss 0  
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 44,814 134,676
Gross unrealized gains 1,641 3,141
Gross unrealized losses (15) 0
Fair value 46,440 $ 137,817
Available-for-sale, allowance for credit loss $ 0