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
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost $ 578,088 $ 563,518  
Gross Unrealized Gains 13,105 23,039  
Gross Unrealized (Losses) (8,881) (1,175)  
Total securities available for sale, Estimated Fair Value 582,312 585,382 627,543
US Government Agencies Debt Securities [Member]
     
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost 1,995 2,581  
Gross Unrealized Gains 803 268  
Gross Unrealized (Losses)        
Total securities available for sale, Estimated Fair Value 2,798 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 235,497 214,980  
Gross Unrealized Gains 7,280 15,123  
Gross Unrealized (Losses) (6,061) (325)  
Total securities available for sale, Estimated Fair Value 236,716 229,778  
Corporate and Other Bonds [Member]
     
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost 5,671 7,353  
Gross Unrealized Gains 96 173  
Gross Unrealized (Losses) (141) (314)  
Total securities available for sale, Estimated Fair Value 5,626 7,212  
Mortgage Backed Securities [Member]
     
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost 331,512 335,327  
Gross Unrealized Gains 4,911 7,383  
Gross Unrealized (Losses) (2,653) (536)  
Total securities available for sale, Estimated Fair Value 333,770 342,174  
Other Securities [Member]
     
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities      
Amortized Cost 3,413 3,277  
Gross Unrealized Gains 15 92  
Gross Unrealized (Losses) (26)     
Total securities available for sale, Estimated Fair Value $ 3,402 $ 3,369