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, 2016
Dec. 31, 2015
Schedule of gross unrealized losses and fair value of investments    
Less than 12 months, Fair value $ 472,297 $ 331,384
Less than 12 Months, Unrealized Losses (9,523) (3,263)
More than 12 Months, Fair value 83,152 46,168
More than 12 Months, Unrealized Losses (1,790) (1,382)
Fair value, Total 555,449 377,552
Unrealized Losses, Total (11,313) (4,645)
Obligations of states and political subdivisions    
Schedule of gross unrealized losses and fair value of investments    
Less than 12 months, Fair value 108,440 8,114
Less than 12 Months, Unrealized Losses (3,007) (70)
More than 12 Months, Fair value 588 4,950
More than 12 Months, Unrealized Losses (72) (70)
Fair value, Total 109,028 13,064
Unrealized Losses, Total (3,079) (140)
Mortgage-backed securities    
Schedule of gross unrealized losses and fair value of investments    
Less than 12 months, Fair value 316,469 287,113
Less than 12 Months, Unrealized Losses (4,979) (2,442)
More than 12 Months, Fair value 42,096 21,660
More than 12 Months, Unrealized Losses (392) (337)
Fair value, Total 358,565 308,773
Unrealized Losses, Total (5,371) (2,779)
Corporate bonds and other securities    
Schedule of gross unrealized losses and fair value of investments    
Less than 12 months, Fair value 47,388 36,157
Less than 12 Months, Unrealized Losses (1,537) (751)
More than 12 Months, Fair value 40,468 19,558
More than 12 Months, Unrealized Losses (1,326) (975)
Fair value, Total 87,856 55,715
Unrealized Losses, Total $ (2,863) $ (1,726)