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
Sep. 30, 2017
Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less than 12 months, Fair Value $ 359,913 $ 472,297
Less than 12 months, Unrealized Losses (3,761) (9,523)
More than 12 Months, Fair Value 84,493 83,152
More than 12 months, Unrealized Losses (1,666) (1,790)
Total, Fair Value 444,406 555,449
Total, Unrealized Losses (5,427) (11,313)
Obligations of States and Political Subdivisions    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less than 12 months, Fair Value 55,319 108,440
Less than 12 months, Unrealized Losses (700) (3,007)
More than 12 Months, Fair Value 9,338 588
More than 12 months, Unrealized Losses (604) (72)
Total, Fair Value 64,657 109,028
Total, Unrealized Losses (1,304) (3,079)
Mortgage-Backed Securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less than 12 months, Fair Value 283,466 316,469
Less than 12 months, Unrealized Losses (2,708) (4,979)
More than 12 Months, Fair Value 42,481 42,096
More than 12 months, Unrealized Losses (545) (392)
Total, Fair Value 325,947 358,565
Total, Unrealized Losses (3,253) (5,371)
Corporate Bonds and Other Securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less than 12 months, Fair Value 21,128 47,388
Less than 12 months, Unrealized Losses (353) (1,537)
More than 12 Months, Fair Value 32,674 40,468
More than 12 months, Unrealized Losses (517) (1,326)
Total, Fair Value 53,802 87,856
Total, Unrealized Losses $ (870) $ (2,863)