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)

v2.4.0.8
SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost $ 1,071,974 $ 675,474
Gross Unrealized Gains 27,050 11,701
Gross Unrealized (Losses) (3,388) (9,827)
Total securities available for sale, Estimated Fair Value 1,095,636 677,348
US Government Agencies Debt Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost 1,328 1,654
Gross Unrealized Gains 603 499
Gross Unrealized (Losses)      
Total securities available for sale, Estimated Fair Value 1,931 2,153
Obligations of States and Political Subdivisions [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost 419,525 255,335
Gross Unrealized Gains 17,545 6,107
Gross Unrealized (Losses) (1,413) (6,612)
Total securities available for sale, Estimated Fair Value 435,657 254,830
Corporate and Other Bonds [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost 79,069 9,479
Gross Unrealized Gains 264 115
Gross Unrealized (Losses) (434) (160)
Total securities available for sale, Estimated Fair Value 78,899 9,434
Mortgage Backed Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost 562,229 405,389
Gross Unrealized Gains 8,605 4,954
Gross Unrealized (Losses) (1,506) (2,981)
Total securities available for sale, Estimated Fair Value 569,328 407,362
Other Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost 9,823 3,617
Gross Unrealized Gains 33 26
Gross Unrealized (Losses) (35) (74)
Total securities available for sale, Estimated Fair Value $ 9,821 $ 3,569