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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
INVESTMENT SECURITIES    
Less than 12 months, Fair Value $ 536,590 $ 126,530
Less than 12 months, Unrealized Losses (17,522) (1,165)
12 months or longer, Fair Value 16,389 20,925
12 months or longer, Unrealized Losses (149) (262)
Total, Fair Value 552,979 147,455
Total, Unrealized Losses (17,671) (1,427)
States and political subdivisions    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 59,427 21,313
Less than 12 months, Unrealized Losses (2,190) (177)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 59,427 21,313
Total, Unrealized Losses (2,190) (177)
Corporate securities    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 30,810 4,869
Less than 12 months, Unrealized Losses (1,197) (131)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 30,810 4,869
Total, Unrealized Losses (1,197) (131)
U.S. Treasury obligations and direct obligations of U.S Government agencies    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 14,001 5,980
Less than 12 months, Unrealized Losses (329) (24)
12 months or longer, Fair Value 16,389 20,925
12 months or longer, Unrealized Losses (149) (262)
Total, Fair Value 30,390 26,905
Total, Unrealized Losses (478) (286)
Residential - U.S. Government-sponsored entities    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 409,049 76,402
Less than 12 months, Unrealized Losses (12,085) (299)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 409,049 76,402
Total, Unrealized Losses (12,085) (299)
Residential - Non-government agencies    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 905 989
Less than 12 months, Unrealized Losses (112) (34)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 905 989
Total, Unrealized Losses (112) (34)
Commercial - U.S. Government-sponsored entities    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 22,398 16,977
Less than 12 months, Unrealized Losses (1,609) (500)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 22,398 16,977
Total, Unrealized Losses $ (1,609) $ (500)