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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Available for Sale    
Amortized cost $ 1,135,728 $ 1,116,545
Gross unrealized gains 33,559 13,737
Gross unrealized losses (693) (3,299)
Fair value 1,168,594 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 692,989 673,918
Gross unrealized gains 21,516 6,003
Gross unrealized losses (28) (2,099)
Fair value 714,477 677,822
Available-for-sale, allowance for credit loss 0  
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale    
Amortized cost 77,743 80,773
Gross unrealized gains 2,926 1,198
Gross unrealized losses (4) (746)
Fair value 80,665 81,225
Available-for-sale, allowance for credit loss 0  
States and political subdivisions    
Available for Sale    
Amortized cost 136,597 119,755
Gross unrealized gains 4,882 2,303
Gross unrealized losses (11) (40)
Fair value 141,468 122,018
Available-for-sale, allowance for credit loss 0  
Corporate securities    
Available for Sale    
Amortized cost 29,221 30,277
Gross unrealized gains 531 252
Gross unrealized losses 0 0
Fair value 29,752 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 36,802 40,769
Gross unrealized gains 25 10
Gross unrealized losses (473) (398)
Fair value 36,354 40,381
Available-for-sale, allowance for credit loss 0  
Residential - Non-government agencies    
Available for Sale    
Amortized cost 30,697 36,377
Gross unrealized gains 1,389 830
Gross unrealized losses 0 (16)
Fair value 32,086 37,191
Available-for-sale, allowance for credit loss 0  
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 131,679 134,676
Gross unrealized gains 2,290 3,141
Gross unrealized losses (177) 0
Fair value 133,792 $ 137,817
Available-for-sale, allowance for credit loss $ 0