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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
INVESTMENT SECURITIES    
Less than 12 months, Fair Value $ 950,976 $ 126,530
Less than 12 months, Unrealized Losses (16,590) (1,165)
12 months or longer, Fair Value 25,588 20,925
12 months or longer, Unrealized Losses (819) (262)
Total, Fair Value 976,564 147,455
Total, Unrealized Losses (17,409) (1,427)
States and political subdivisions    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 78,547 21,313
Less than 12 months, Unrealized Losses (1,419) (177)
12 months or longer, Fair Value 7,960 0
12 months or longer, Unrealized Losses (380) 0
Total, Fair Value 86,507 21,313
Total, Unrealized Losses (1,799) (177)
Corporate securities    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 26,258 4,869
Less than 12 months, Unrealized Losses (516) (131)
12 months or longer, Fair Value 4,797 0
12 months or longer, Unrealized Losses (203) 0
Total, Fair Value 31,055 4,869
Total, Unrealized Losses (719) (131)
U.S. Treasury obligations and direct obligations of U.S Government agencies    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 16,826 5,980
Less than 12 months, Unrealized Losses (234) (24)
12 months or longer, Fair Value 11,903 20,925
12 months or longer, Unrealized Losses (157) (262)
Total, Fair Value 28,729 26,905
Total, Unrealized Losses (391) (286)
Residential - U.S. Government-sponsored entities    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 808,115 76,402
Less than 12 months, Unrealized Losses (13,553) (299)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 808,115 76,402
Total, Unrealized Losses (13,553) (299)
Residential - Non-government agencies    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 0 989
Less than 12 months, Unrealized Losses 0 (34)
12 months or longer, Fair Value 928 0
12 months or longer, Unrealized Losses (79) 0
Total, Fair Value 928 989
Total, Unrealized Losses (79) (34)
Commercial - U.S. Government-sponsored entities    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 21,230 16,977
Less than 12 months, Unrealized Losses (868) (500)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 21,230 16,977
Total, Unrealized Losses $ (868) $ (500)