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
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost $ 1,072,887 $ 675,474
Gross Unrealized Gains 26,085 11,701
Gross Unrealized (Losses) (4,195) (9,827)
Total securities available for sale, Estimated Fair Value 1,094,777 677,348
US Government Agencies Debt Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost 1,466 1,654
Gross Unrealized Gains 1,649 499
Gross Unrealized (Losses)      
Total securities available for sale, Estimated Fair Value 3,115 2,153
Obligations of States and Political Subdivisions [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost 420,297 255,335
Gross Unrealized Gains 14,960 6,107
Gross Unrealized (Losses) (2,360) (6,612)
Total securities available for sale, Estimated Fair Value 432,897 254,830
Corporate and Other Bonds [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost 79,379 9,479
Gross Unrealized Gains 335 115
Gross Unrealized (Losses) (476) (160)
Total securities available for sale, Estimated Fair Value 79,238 9,434
Mortgage Backed Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost 558,424 405,389
Gross Unrealized Gains 9,108 4,954
Gross Unrealized (Losses) (1,331) (2,981)
Total securities available for sale, Estimated Fair Value 566,201 407,362
Other Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost 13,321 3,617
Gross Unrealized Gains 33 26
Gross Unrealized (Losses) (28) (74)
Total securities available for sale, Estimated Fair Value $ 13,326 $ 3,569