Annual report pursuant to Section 13 and 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
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total $ 947,597 $ 891,276
Gross Unrealized Gains 10,480 16,661
Gross Unrealized (Losses) (11,313) (4,645)
Available for sale securities, Estimated fair value 946,764 903,292
Obligations of states and political subdivisions    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 274,007 257,740
Gross Unrealized Gains 4,962 10,479
Gross Unrealized (Losses) (3,079) (140)
Available for sale securities, Estimated fair value 275,890 268,079
Corporate bonds    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 123,674 77,628
Gross Unrealized Gains 892 55
Gross Unrealized (Losses) (2,786) (1,704)
Available for sale securities, Estimated fair value 121,780 75,979
Mortgage-backed securities    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 536,031 544,823
Gross Unrealized Gains 4,626 6,127
Gross Unrealized (Losses) (5,371) (2,779)
Available for sale securities, Estimated fair value 535,286 548,171
Other securities    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 13,885 11,085
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (77) (22)
Available for sale securities, Estimated fair value $ 13,808 $ 11,063