Quarterly report pursuant to Section 13 or 15(d)

SECURITIES (Schedule of Gross Unrealized Losses and Fair Value of Investments) (Details)

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SECURITIES (Schedule of Gross Unrealized Losses and Fair Value of Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule of gross unrealized losses and fair value of investments [Line Items]    
Less than 12 months, Fair Value $ 105,040 $ 475,029
Less than 12 months, Unrealized Losses (417) (5,361)
More than 12 Months, Fair Value 503,030 385,433
More than 12 months, Unrealized Losses (6,599) (10,184)
Total, Fair Value 608,070 860,462
Total, Unrealized Losses (7,016) (15,545)
Obligations of states and political subdivisions    
Schedule of gross unrealized losses and fair value of investments [Line Items]    
Less than 12 months, Fair Value 777 133,513
Less than 12 months, Unrealized Losses (4) (1,566)
More than 12 Months, Fair Value 4,823 10,145
More than 12 months, Unrealized Losses (77) (375)
Total, Fair Value 5,600 143,658
Total, Unrealized Losses (81) (1,941)
Corporate and other bonds    
Schedule of gross unrealized losses and fair value of investments [Line Items]    
Less than 12 months, Fair Value 34,413 35,478
Less than 12 months, Unrealized Losses (206) (315)
More than 12 Months, Fair Value 39,561 33,888
More than 12 months, Unrealized Losses (601) (668)
Total, Fair Value 73,974 69,366
Total, Unrealized Losses (807) (983)
Mortgage-backed securities    
Schedule of gross unrealized losses and fair value of investments [Line Items]    
Less than 12 months, Fair Value 69,850 306,038
Less than 12 months, Unrealized Losses (207) (3,480)
More than 12 Months, Fair Value 458,646 341,400
More than 12 months, Unrealized Losses (5,921) (9,141)
Total, Fair Value 528,496 647,438
Total, Unrealized Losses $ (6,128) $ (12,621)