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, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Schedule of gross unrealized losses and fair value of investments    
Less than 12 months, Fair value $ 315,278 $ 255,469
Less than 12 months, Unrealized Losses (3,903) (8,390)
More than 12 Months, Fair value 64,837 34,860
More than 12 Months, Unrealized Losses (3,362) (1,437)
Fair value, Total 380,115 290,329
Unrealized Losses, Total (7,265) (9,827)
Obligations of States and Political Subdivisions [Member]
    
Schedule of gross unrealized losses and fair value of investments    
Less than 12 months, Fair value 59,906 80,368
Less than 12 months, Unrealized Losses (1,267) (5,504)
More than 12 Months, Fair value 39,268 8,886
More than 12 Months, Unrealized Losses (2,816) (1,108)
Fair value, Total 99,174 89,254
Unrealized Losses, Total (4,083) (6,612)
Mortgage Backed Securities [Member]
    
Schedule of gross unrealized losses and fair value of investments    
Less than 12 months, Fair value 224,200 168,297
Less than 12 months, Unrealized Losses (2,210) (2,806)
More than 12 Months, Fair value 23,849 24,254
More than 12 Months, Unrealized Losses (391) (175)
Fair value, Total 248,049 192,551
Unrealized Losses, Total (2,601) (2,981)
Corporate Bonds and Other Securities [Member]
    
Schedule of gross unrealized losses and fair value of investments    
Less than 12 months, Fair value 31,172 6,804
Less than 12 months, Unrealized Losses (426) (80)
More than 12 Months, Fair value 1,720 1,720
More than 12 Months, Unrealized Losses (155) (154)
Fair value, Total 32,892 8,524
Unrealized Losses, Total $ (581) $ (234)