Quarterly report pursuant to Section 13 or 15(d)

SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details)

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SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost $ 585,824 $ 563,518  
Gross Unrealized Gains 12,499 23,039  
Gross Unrealized (Losses) (8,886) (1,175)  
Total securities available for sale, Estimated Fair Value 589,437 585,382 622,067
US Government Agencies Debt Securities [Member]
     
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost 1,775 2,581  
Gross Unrealized Gains 856 268  
Gross Unrealized (Losses)        
Total securities available for sale, Estimated Fair Value 2,631 2,849  
Obligations of States and Political Subdivisions [Member]
     
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost 236,840 214,980  
Gross Unrealized Gains 6,710 15,123  
Gross Unrealized (Losses) (6,309) (325)  
Total securities available for sale, Estimated Fair Value 237,241 229,778  
Corporate and Other Bonds [Member]
     
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost 5,584 7,353  
Gross Unrealized Gains 122 173  
Gross Unrealized (Losses) (162) (314)  
Total securities available for sale, Estimated Fair Value 5,544 7,212  
Mortgage Backed Securities [Member]
     
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost 338,011 335,327  
Gross Unrealized Gains 4,792 7,383  
Gross Unrealized (Losses) (2,378) (536)  
Total securities available for sale, Estimated Fair Value 340,425 342,174  
Other Securities [Member]
     
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost 3,614 3,277  
Gross Unrealized Gains 19 92  
Gross Unrealized (Losses) (37)     
Total securities available for sale, Estimated Fair Value $ 3,596 $ 3,369