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
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 931,034 $ 891,276
Gross Unrealized Gains 26,253 16,661
Gross Unrealized (Losses) (2,303) (4,645)
Estimated Fair Value 954,984 903,292
Obligations of States and Political Subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 266,291 257,740
Gross Unrealized Gains 13,147 10,479
Gross Unrealized (Losses) (215) (140)
Estimated Fair Value 279,223 268,079
Corporate and Other Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 122,130 77,628
Gross Unrealized Gains 1,196 55
Gross Unrealized (Losses) (1,579) (1,704)
Estimated Fair Value 121,747 75,979
Mortgage-Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 529,228 544,823
Gross Unrealized Gains 11,877 6,127
Gross Unrealized (Losses) (509) (2,779)
Estimated Fair Value 540,596 548,171
Other Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 13,385 11,085
Gross Unrealized Gains 33 0
Gross Unrealized (Losses) 0 (22)
Estimated Fair Value $ 13,418 $ 11,063