Annual report pursuant to Section 13 and 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
Dec. 31, 2018
Dec. 31, 2017
Schedule of gross unrealized losses and fair value of investments    
Less than 12 months, Fair value $ 475,029 $ 335,205
Less than 12 Months, Unrealized Losses (5,361) (3,498)
More than 12 Months, Fair value 385,433 197,640
More than 12 Months, Unrealized Losses (10,184) (4,188)
Fair value, Total 860,462 532,845
Unrealized Losses, Total (15,545) (7,686)
Obligations of states and political subdivisions    
Schedule of gross unrealized losses and fair value of investments    
Less than 12 months, Fair value 133,513 25,790
Less than 12 Months, Unrealized Losses (1,566) (132)
More than 12 Months, Fair value 10,145 16,934
More than 12 Months, Unrealized Losses (375) (432)
Fair value, Total 143,658 42,724
Unrealized Losses, Total (1,941) (564)
Mortgage-backed securities    
Schedule of gross unrealized losses and fair value of investments    
Less than 12 months, Fair value 306,038 298,439
Less than 12 Months, Unrealized Losses (3,480) (3,267)
More than 12 Months, Fair value 341,400 136,298
More than 12 Months, Unrealized Losses (9,141) (2,902)
Fair value, Total 647,438 434,737
Unrealized Losses, Total (12,621) (6,169)
Corporate bonds and other securities    
Schedule of gross unrealized losses and fair value of investments    
Less than 12 months, Fair value 35,478 10,976
Less than 12 Months, Unrealized Losses (315) (99)
More than 12 Months, Fair value 33,888 44,408
More than 12 Months, Unrealized Losses (668) (854)
Fair value, Total 69,366 55,384
Unrealized Losses, Total $ (983) $ (953)