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
Jun. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 927,438 $ 891,276
Gross Unrealized Gains 24,568 16,661
Gross Unrealized (Losses) (2,343) (4,645)
Estimated Fair Value 949,663 903,292
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 258,968 257,740
Gross Unrealized Gains 13,848 10,479
Gross Unrealized (Losses) (30) (140)
Estimated Fair Value 272,786 268,079
Corporate and Other Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 109,757 77,628
Gross Unrealized Gains 506 55
Gross Unrealized (Losses) (1,684) (1,704)
Estimated Fair Value 108,579 75,979
Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 545,428 544,823
Gross Unrealized Gains 10,165 6,127
Gross Unrealized (Losses) (629) (2,779)
Estimated Fair Value 554,964 548,171
Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 13,285 11,085
Gross Unrealized Gains 49 0
Gross Unrealized (Losses) 0 (22)
Estimated Fair Value $ 13,334 $ 11,063