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
Mar. 31, 2016
Dec. 31, 2015
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Amortized Cost $ 922,870 $ 891,276
Gross Unrealized Gains 20,083 16,661
Gross Unrealized (Losses) (3,544) (4,645)
Available for sale securities, Estimated fair value 939,409 903,292
Obligations of States and Political Subdivisions [Member]    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Amortized Cost 254,851 257,740
Gross Unrealized Gains 11,267 10,479
Gross Unrealized (Losses) (149) (140)
Available for sale securities, Estimated fair value 265,969 268,079
Corporate and Other Bonds [Member]    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Amortized Cost 95,468 77,628
Gross Unrealized Gains 287 55
Gross Unrealized (Losses) (1,989) (1,704)
Available for sale securities, Estimated fair value 93,766 75,979
Mortgage Backed Securities [Member]    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Amortized Cost 561,466 544,823
Gross Unrealized Gains 8,502 6,127
Gross Unrealized (Losses) (1,406) (2,779)
Available for sale securities, Estimated fair value 568,562 548,171
Other Securities [Member]    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Amortized Cost 11,085 11,085
Gross Unrealized Gains 27  
Gross Unrealized (Losses)   (22)
Available for sale securities, Estimated fair value $ 11,112 $ 11,063