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, 2017
Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less than 12 months, Fair Value $ 368,804 $ 472,297
Less than 12 months, Unrealized Losses (5,996) (9,523)
More than 12 Months, Fair Value 79,042 83,152
More than 12 months, Unrealized Losses (1,098) (1,790)
Total, Fair Value 447,846 555,449
Total, Unrealized Losses (7,094) (11,313)
Obligations of States and Political Subdivisions    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less than 12 months, Fair Value 63,155 108,440
Less than 12 months, Unrealized Losses (2,001) (3,007)
More than 12 Months, Fair Value 596 588
More than 12 months, Unrealized Losses (63) (72)
Total, Fair Value 63,751 109,028
Total, Unrealized Losses (2,064) (3,079)
Mortgage-Backed Securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less than 12 months, Fair Value 277,308 316,469
Less than 12 months, Unrealized Losses (3,414) (4,979)
More than 12 Months, Fair Value 38,209 42,096
More than 12 months, Unrealized Losses (378) (392)
Total, Fair Value 315,517 358,565
Total, Unrealized Losses (3,792) (5,371)
Corporate Bonds and Other Securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less than 12 months, Fair Value 28,341 47,388
Less than 12 months, Unrealized Losses (581) (1,537)
More than 12 Months, Fair Value 40,237 40,468
More than 12 months, Unrealized Losses (657) (1,326)
Total, Fair Value 68,578 87,856
Total, Unrealized Losses $ (1,238) $ (2,863)