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
Jun. 30, 2019
Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]    
Total HTM securities $ 558,503 $ 492,272
Gross Unrealized Gains 39,072  
Gross Unrealized (Losses) 0  
Estimated Fair Value 597,575 499,501
Obligations of states and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Total HTM securities 547,591 492,272
Gross Unrealized Gains 38,966 7,375
Gross Unrealized (Losses) 0 (146)
Estimated Fair Value 586,557 $ 499,501
Mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Total HTM securities 10,912  
Gross Unrealized Gains 106  
Gross Unrealized (Losses) 0  
Estimated Fair Value $ 11,018