Annual report pursuant to Section 13 and 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
Dec. 31, 2020
Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]    
Total HTM Securities $ 544,851 $ 555,144
Gross Unrealized Gains 74,982 48,359
Gross Unrealized Losses (68) 0
Held-to-maturity Securities, Fair Value 619,765 603,503
U.S. government and agency securities    
Schedule of Held-to-maturity Securities [Line Items]    
Total HTM Securities 2,751 2,813
Gross Unrealized Gains 0 26
Gross Unrealized Losses (18) 0
Held-to-maturity Securities, Fair Value 2,733 2,839
Obligations of states and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Total HTM Securities 536,767 545,148
Gross Unrealized Gains 74,978 48,274
Gross Unrealized Losses 0 0
Held-to-maturity Securities, Fair Value 611,745 593,422
Commercial    
Schedule of Held-to-maturity Securities [Line Items]    
Total HTM Securities 5,333 7,183
Gross Unrealized Gains 4 59
Gross Unrealized Losses (50) 0
Held-to-maturity Securities, Fair Value 5,287 7,242
Agency | Commercial    
Schedule of Held-to-maturity Securities [Line Items]    
Total HTM Securities 5,333 7,183
Gross Unrealized Gains 4 59
Gross Unrealized Losses (50) 0
Held-to-maturity Securities, Fair Value 5,287 7,242
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