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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
INVESTMENT SECURITIES    
Less than 12 months, Fair Value $ 786,586 $ 126,530
Less than 12 months, Unrealized Losses (11,063) (1,165)
12 months or longer, Fair Value 13,277 20,925
12 months or longer, Unrealized Losses (173) (262)
Total, Fair Value 799,863 147,455
Total, Unrealized Losses (11,236) (1,427)
States and political subdivisions    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 48,529 21,313
Less than 12 months, Unrealized Losses (988) (177)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 48,529 21,313
Total, Unrealized Losses (988) (177)
Corporate securities    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 31,376 4,869
Less than 12 months, Unrealized Losses (515) (131)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 31,376 4,869
Total, Unrealized Losses (515) (131)
U.S. Treasury obligations and direct obligations of U.S Government agencies    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 16,694 5,980
Less than 12 months, Unrealized Losses (236) (24)
12 months or longer, Fair Value 12,858 20,925
12 months or longer, Unrealized Losses (141) (262)
Total, Fair Value 29,552 26,905
Total, Unrealized Losses (377) (286)
Residential - U.S. Government-sponsored entities    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 666,130 76,402
Less than 12 months, Unrealized Losses (8,685) (299)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 666,130 76,402
Total, Unrealized Losses (8,685) (299)
Residential - Non-government agencies    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 521 989
Less than 12 months, Unrealized Losses (41) (34)
12 months or longer, Fair Value 419 0
12 months or longer, Unrealized Losses (32) 0
Total, Fair Value 940 989
Total, Unrealized Losses (73) (34)
Commercial - U.S. Government-sponsored entities    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 23,336 16,977
Less than 12 months, Unrealized Losses (598) (500)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 23,336 16,977
Total, Unrealized Losses $ (598) $ (500)