Quarterly report pursuant to Section 13 or 15(d)

SECURITIES (Schedule of Carrying Value, Gross Unrealized Gains and Losses and Estimated Fair Value of Securities) (Details)

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SECURITIES (Schedule of Carrying Value, Gross Unrealized Gains and Losses and Estimated Fair Value of Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]    
Total HTM Securities $ 535,722 $ 544,851
Gross Unrealized Gains 62,768 74,982
Gross Unrealized Losses (38) (68)
Held-to-maturity Securities, Fair Value 598,452 619,765
U.S. government and agency securities    
Schedule of Held-to-maturity Securities [Line Items]    
Total HTM Securities 2,637 2,751
Gross Unrealized Gains 2 0
Gross Unrealized Losses (8) (18)
Held-to-maturity Securities, Fair Value 2,631 2,733
Obligations of states and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Total HTM Securities 528,157 536,767
Gross Unrealized Gains 62,763 74,978
Gross Unrealized Losses 0 0
Held-to-maturity Securities, Fair Value 590,920 611,745
Commercial    
Schedule of Held-to-maturity Securities [Line Items]    
Total HTM Securities 4,928 5,333
Gross Unrealized Gains 3 4
Gross Unrealized Losses (30) (50)
Held-to-maturity Securities, Fair Value 4,901 5,287
Agency | Commercial    
Schedule of Held-to-maturity Securities [Line Items]    
Total HTM Securities 4,928 5,333
Gross Unrealized Gains 3 4
Gross Unrealized Losses (30) (50)
Held-to-maturity Securities, Fair Value 4,901 5,287
Non-agency | Commercial    
Schedule of Held-to-maturity Securities [Line Items]    
Total HTM Securities 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Held-to-maturity Securities, Fair Value $ 0 $ 0