Quarterly report pursuant to Section 13 or 15(d)

SECURITIES (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details)

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SECURITIES (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2015
Sep. 30, 2016
Dec. 31, 2015
Amortized Cost      
Due in one year or less   $ 16,667 $ 8,380
Due after one year through five years   109,700 65,326
Due after five years through ten years   314,903 296,864
Due after ten years   489,764 520,706
Total securities available for sale   931,034 891,276
Estimated Fair Value      
Due in one year or less   16,860 8,370
Due after one year through five years   113,093 66,996
Due after five years through ten years   324,270 301,920
Due after ten years   500,761 526,006
Total securities available for sale   954,984 903,292
Carrying Value      
Due in one year or less   850 1,488
Due after one year through five years   25,918 4,294
Due after five years through ten years   48,243 44,736
Due after ten years   125,828 154,856
Total securities held to maturity   200,839 205,374
Estimated Fair Value      
Due in one year or less   850 1,491
Due after one year through five years   26,561 4,348
Due after five years through ten years   50,017 45,501
Due after ten years   132,289 158,097
Total securities held to maturity   209,717 209,437
Held to maturity securities unrealized gains before tax $ 8,100 $ 5,600 $ 6,800