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
Jun. 30, 2017
Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less than 12 months, Fair Value $ 245,594 $ 472,297
Less than 12 months, Unrealized Losses (2,520) (9,523)
More than 12 Months, Fair Value 81,078 83,152
More than 12 months, Unrealized Losses (1,095) (1,790)
Total, Fair Value 326,672 555,449
Total, Unrealized Losses (3,615) (11,313)
Obligations of States and Political Subdivisions    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less than 12 months, Fair Value 27,804 108,440
Less than 12 months, Unrealized Losses (717) (3,007)
More than 12 Months, Fair Value 624 588
More than 12 months, Unrealized Losses (36) (72)
Total, Fair Value 28,428 109,028
Total, Unrealized Losses (753) (3,079)
Mortgage-Backed Securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less than 12 months, Fair Value 197,560 316,469
Less than 12 months, Unrealized Losses (1,436) (4,979)
More than 12 Months, Fair Value 41,582 42,096
More than 12 months, Unrealized Losses (459) (392)
Total, Fair Value 239,142 358,565
Total, Unrealized Losses (1,895) (5,371)
Corporate Bonds and Other Securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less than 12 months, Fair Value 20,230 47,388
Less than 12 months, Unrealized Losses (367) (1,537)
More than 12 Months, Fair Value 38,872 40,468
More than 12 months, Unrealized Losses (600) (1,326)
Total, Fair Value 59,102 87,856
Total, Unrealized Losses $ (967) $ (2,863)